Parts & Accessories

- Di2 internal battery, fits all e-Tube Di2 groups - Capacity: 500 mAH (± 2000km) - Use with EW-WU101 or SC-MT800 interfaces/junction to gain BlueTooth Smart wireless connectivity for on-the-fly adjustments with smartphones and tablets - Requires SM-BCR2 charger

The new DN300 Built-In type battery features the same waterproof design that Di2 users have loved for generations. Now with 3 ports, it delivers stable power to Shimano's 12-speed road derailleurs (and shifters if a fully wired option is selected). - Compatible with thinner next-generation electric wire SD300 and systems after R9250/R8150 series - Li-Ion type - Capacity: 500 mAH |3.7Wh (± 2000km autonomy) - Rated voltage: 7.4V - Charges through RD-R9250 |RD-R8150 rear derailleur using EW-EC300 Di2 Charging Cable (sold separately) - Fixing small parts included - Weight: 52g

Replacement/Spare Part – UNI-GO2 GoPro Adapter Bracket Allows mounting of Serfas headlights to GoPro action camera mount systems (e.g. helmet mount, handlebar mount, etc.) - Compatible with all current E-Lume and late model True Series headlights

3-IN-1 Handlebar Mounted Accessory Holder: 3-IN-1 Design: - Headlights - Action Cameras (GoPro) - Garmin Computers (Compatible w/ Garmin Only) - Adjustable Angle (100 Degree Tilt Up/Down) - Materials: Aluminum Alloy, Nylon - Simple Installation Specs: - Length: 105mm - Width: 68mm - Height: 57mm - Weight: 76g - Snap Ring Fitment: 31.8-32mm Bars - Max Load: 400g

The QuickView was designed to put the Garmin Edge Computer out in front of the stem. Fits Garmin 605 and 705. - Glass-filled nylon, stainless steel Torx T25 bolt - Weight: 20g

External Blip mount for aero extensions and base bars - 360 degree rotation for adjustment - Aero use only to fit 22.2mm OD bar 65mm in length - Fits all Zipp aero extensions and base bars - Blips not included - Weight: 57 grams for pair (does not include Blip) - Material: Polypropylene + TPE - Compatibility: 11-speed - Recommended Group: SRAM RED eTap

SRAM eTap batteries are literally a snap to remove and charge. Just flip the tool-free battery latch up and slide the battery up and out of the derailleur. Then snap the battery into the USB powered charger and connect the charger to any USB power source or A/C USB adaptor. A full charge takes just 45 minutes to complete. - Finish: Black - Compatibility: SRAM RED eTap

SRAM eTap Battery is the power source for the eTap system. The same power unit is interchangeable between front and rear derailleurs. - Up to 1000 kilometers of riding per charge - Weight: 24g - Finish: Black - Compatibility: SRAM RED eTap

Be it the fireworks of a finale, an ideal rhythm, climbing on the top, or a deep, dark place extracting the last kilojoule of effort on your bike split, you want to adjust your gear with the twitch of a finger. eTap Blip satellite shifters allow you to shift when you want, where you want. - Limitless remote shifting positions for drop and aero bars - Wired shift buttons can be positioned however the rider prefers - Connect to Blip Box or drop bar eTap levers - Compatible with SRAM RED eTap shift/brake controls

- Shift buttons mounted to the end of a bar plug - Included wire connects to Blip Box - Fits bars with 19 - 20.5mm inside diameter

COMPIT Phone Covers (or the COMPIT Phone Adapter) are needed to securely mount the phone to the COMPIT unit. The cover has a special mounting device that allows the phone to be docked into the COMPIT system. Enclosing the outer edges of the phone and extra-durable at the points of maximum stress, this cover is made of shock-absorbing, high-quality, wear-resistant plastic. It can be easily attached and removed from the phone. - For iPhone 11 Pro

COMPIT Phone Covers (or the COMPIT Phone Adapter) are needed to securely mount the phone to the COMPIT unit. The cover has a special mounting device that allows the phone to be docked into the COMPIT system. Enclosing the outer edges of the phone and extra-durable at the points of maximum stress, this cover is made of shock-absorbing, high-quality, wear-resistant plastic. It can be easily attached and removed from the phone. - For iPhone 6+/7+/8+

COMPIT Phone Covers (or the COMPIT Phone Adapter) are needed to securely mount the phone to the COMPIT unit. The cover has a special mounting device that allows the phone to be docked into the COMPIT system. Enclosing the outer edges of the phone and extra-durable at the points of maximum stress, this cover is made of shock-absorbing, high-quality, wear-resistant plastic. It can be easily attached and removed from the phone. - For iPhone 6/7/8

COMPIT Phone Covers (or the COMPIT Phone Adapter) are needed to securely mount the phone to the COMPIT unit. The cover has a special mounting device that allows the phone to be docked into the COMPIT system. Enclosing the outer edges of the phone and extra-durable at the points of maximum stress, this cover is made of shock-absorbing, high-quality, wear-resistant plastic. It can be easily attached and removed from the phone. - For iPhone X/XS

COMPIT Phone Covers (or the COMPIT Phone Adapter) are needed to securely mount the phone to the COMPIT unit. The cover has a special mounting device that allows the phone to be docked into the COMPIT system. Enclosing the outer edges of the phone and extra-durable at the points of maximum stress, this cover is made of shock-absorbing, high-quality, wear-resistant plastic. It can be easily attached and removed from the phone. - For iPhone XR/11

COMPIT Universal-Cover Adapter (or COMPIT Phone Covers) are needed to securely mount the phone to the COMPIT unit. The adapter with the special mounting device allows the phone to be docked into the COMPIT system. The cover attaches to the user's favorite phone case with self-adhesive 3M film.

MORE POWER, WITH SECURITY, MORE COMFORT. Water-repellent mobile phone case for the bicycle handlebar Everything in view - in any weather: The smartphone case COM/SMARTBAG can be attached to any COMPIT cell phone holder thanks to the adapter. A special COMPIT cover is therefore not necessary. The large transparent window ensures that the touchscreen is easy to operate, and it is also possible to unlock the cell phone with a fingerprint directly through the film. The lower extra compartment not only offers additional storage space for keys and money, but also space for the COM/UNIT power bank for inductive charging of the mobile phone while driving. For attachment to the COMPIT mobile phone holder system When touring in rough terrain, it is advisable to charge the cell phone with a cable. Optionally, the COM/UNIT can also be attached directly under the SMARTBAG to the COMPIT smartphone holder. In this case, the mobile phone must always be charged via cable through the cable guide. Suitable for smartphones with a maximum size of 155 x 80 x 15 mm. - Only compatible with the COMPIT system - Extra storage space - Water-repellent - Can be operated through foil - For all common smartphones - Weight: 115g

Spare parts for Quarq's ShockWiz automated suspension tuning device. - Contains a rubber mounting boot, four zip ties, plastic cap and two o-rings.

Your tires are the only thing connecting you to the road or trail, and having optimal tire pressure can have more impact on ride comfort than both frame and wheel choice combined. But finding the right tire pressure requires trial and error. TyreWiz is the first-of-its-kind tire pressure sensor for riders of gravel bikes and road bikes, taking the guesswork out of finding that optimal tire pressure. Lightweight and durable, TyreWiz adds only 10 grams to your tires. With an IPX7 waterproof and dustproof rating, you can confidently ride on any type of trail and know that your tire pressure sensor will keep going strong. TyreWiz reports data with +/-2% accuracy at a resolution of .1 PSI; vastly more accurate than any tire pump on the market. TyreWiz monitors the air pressure in real-time and relays the data to a cycling computer or a smartphone. That information is relayed to the SRAM AXS app and delivers personalized recommendations and pressure alerts. TyreWiz gives riders access to highly accurate, real-time tire pressure data to make decisions that can affect rolling resistance, traction, tire wear, and rider comfort. Features - Designed for road and gravel riders. - Personalized tire recommendations in the smartphone app for iOS and Android. - Data reported with +/- 2% accuracy at .1 PSI resolution. - Broadly compatible with tires that use a removable Presta-style valve core. - Inexpensive, user-replaceable CR1632 battery lasts for 300 hours. - IPX7 dustproof/waterproof rating. - Box includes valve-core removal tool for installation.

Profile Design's UCM XL Universal Computer Mount provides a convenient 60mm-long place to mount your computer on your aero bars. It installs without tools, stays put and can be positioned as needed for easily viewing and controlling your computer.

- A great way to mount a light, computer, power meter or GPS unit in the center of a threadless stem - Made in the USA - Material: 6061 Aluminum - Weight: 24g - Outside Diameter: 26.0mm - Stem Size: Threadless 1-1/8"

- Discreet way to install an Apple AirTag inside your tubeless tire - Identify the location of a stolen bike, enabling the owner to alert local authorities for retrieval - AirTag is housed in a 3-part silicone and rubber tubeless valve mount - Sacrificial stem, ensures tracker and rim protection under impact - Silicone top cover protects tracker and internal plug reduces sealant ingress - Supplied with 3 pairs of our rubber valve bases to suit different rim profiles for the optimum seal Note the Tubeless Secure Tag Holder can only be used in rear wheels – not for use on the front wheel Compatible tire types: - MTB tyres (XC, Enduro Trail, Downhill) - Gravel Tires (the narrowest recommended tyre size is 38mm wide)

Replacement GPS mount insert for the Direct X-Lock Mount System and the Alloy CNC Forward Mount.

Each GPS unit comes with a Standard GPS Mount. Included are two sets of o-rings (two diameters), plus a backup o-ring in each size, a rubber shim and an X-Lock composite mounting bracket. The rubber shim supports the X-Lock mount which is engineered to attach at any 9° angle and still allow the computer to be mounted forward. The two super durable o-rings secure it to the bar, and the patent-pending X-Lock design will prevent the computer from being knocked out. The X-Lock securely fastens the GPS computer to the mount by pressing down at a 45° angle and rotating it forward until it "locks" into place.

Easily secure your GPS cycling computer to your favorite bike. Includes: - Two sets of O-rings (two diameters) - A backup O-ring in each size

The Forward Mount is a hinged handlebar mount featuring a stiff and durable composite matrix construction with secure X-Lock and an integrated rubber shim. With a pressed-in stainless steel nut and 3mm hex stainless steel bolt, this mount's sleek, lightweight design positions the GPS computer in front of the stem for better visibility and improved aerodynamics. The X-Lock is a secure and reliable mounting feature integrated into the Standard GPS Mount and the Forward GPS Mount. It safely locks in the computer for worry-free riding over any type of terrain.

Lightweight, rugged CNC machined aluminum aero bicycle mount. Simple, reliable single-pivot 31.8 bar clamp. Secondary adjustable swivel provides perfect device positioning. Compatible with Lezyne X-Lock mount GPS cycling computers. Extra-secure and replaceable Composite Matrix X-Lock insert. Refined aluminum design with classic Lezyne styling. All stainless steel hardware. Perfect for the cyclist looking to streamline his or her cockpit with a beautifully stealth anodized black GPS computer mount. - Weight: 37g

Super-compact and lightweight magnet-less cycling cadence sensor. Translucent Composite Matrix construction with LED indicator. Simple installation that mounts to a crankarm. High-tech dual Bluetooth system that can simultaneously pair with cycling computers and smart trainers. Features a replaceable CR2032 battery. - Weight: 11g - Dimensions: 37 x 33 x 13mm

Super-compact and lightweight magnet-less cycling speed sensor. Translucent Composite Matrix construction with LED indicator. Simple installation that mounts to most hubs. High-tech dual Bluetooth system that can simultaneously pair with cycling computers and smart trainers. Features a replaceable CR2032 battery. - Weight: 11g - Dimensions: 37 x 33 x 13mm

Super-compact and lightweight magnet-less cycling sensors. The pair includes the Pro Speed Sensor (hub mounted) and the Pro Cadence Sensor (crank arm mounted). Both feature a translucent Composite Matrix construction with a LED indicator. And each has a high-tech dual Bluetooth system that can simultaneously pair with cycling computers and smart trainers. Replaceable CR2032 battery included. - Weight: 11g - Dimensions: 37 x 33 x 13mm

This NiteRider Adapter is sold separately from K-EDGE “Combo Mount." - Precision Machined 6061-T6 Aluminum - Anodized Gunmetal - Converts a NiteRider Rail Interface to adapt K-Edge GoPro Mounting Interface - Enables compatibility with K-Edge GoBig Mounts and Combo Mounts - 2x M4 Mounting bolts with Nylok included - Compatible with Lumina Series, Mako Series - Weight: 11.5 grams

The K-EDGE Gravity Cap is a great computer mount option for those riders that already a lot going on with the cockpit of their bikes, or just want a simple and sleek computer mount. The Gravity Cap replaces your existing top cap and is ideal for Downhill, Enduro, Gravel, Touring, etc. - CNC Machined 6061-T6 Aluminum - Injection Molded Copolymer Interface - Compatibility: Wahoo ELEMNT - Lifetime Warranty - Weight: 18g - Anodized Colors: Black

K-EDGE’s legendary CNC machined aluminum quality and strength for the price conscious cyclist. Pro positioning of your computer, out-front and flush with the top of the handlebar. - CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface - Compatible: Garmin EDGE 820, 520, 510, 500, 25 and 20. - Replaceable Garmin Insert with K-EDGE “Definitive Click” locking system - Fits 31.8MM Handlebars - NOT combo compatible - Weight: 48g - Anodized Color- Black

K-EDGE’s legendary CNC machined aluminum quality and strength for the price conscious cyclist. Pro positioning of your computer, out-front and flush with the top of the handlebar. - CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface - Compatibility: Wahoo Bolt - Fits Handlebars: 31.8MM - NOT GoPro Interface Compatible - Anodized Color: Black Please contact K-EDGE warranty manager Info@K-EDGE.com for questions or concerns. We highly suggest you follow the recommendations in the Sigma instructions that recommend use of the provided tether leash.

The Top Tube Mount places your computer front and center on the top tube of Gravel, MTB, and Adventure Bikes with preset mounting positions. - Compatible with all Garmin cycling computers - Multi-mount positions - Garmin approved insert protects the computer body tabs in the event of a crash - All hardware included - CNC machined in Boise, Idaho USA - Made in USA - Lifetime warranty

An excellent choice for mountain, cross, and road cyclists who prefer to have the computer above the stem. The mount replaces a standard 5mm spacer and is locked securely in place by the top cap compression system. - Supported Computers – Wahoo ELEMNT, Wahoo Bolt, Wahoo MINI - Compatible – 1-1/8" Steerer tube Diameter, - Thickness: 5mm, Length 50mm (Center-to-Center) - Recommended for 0 Degree to Negative Degree Stem Angles - CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface - Weight: 25g - Made in Boise, Idaho, USA - Lifetime Guarantee against material or manufacture defects. Damages due to abuse or crashing excluded

A simple, lightweight and versatile mount for positioning the Wahoo ELEMNT between the aero bars. Single bolt clamp and pivoting mount design. - For 22.2mm diameter aero bar extensions - Compatible with Wahoo ELEMNT, Wahoo Bolt, Wahoo MINI - Combo Compatible with use of adapter for GoPro style interface action camera and lights - Replaceable Wahoo insert - Weight: 29g - Anodized Colors: Black - Made in Boise, Idaho, USA - Lifetime Guarantee against material or manufacture defects. Damages due to abuse or crashing excluded

- CNC Machined Aluminum - Combo Compatible (580 Add-On sold separately) - WAHOO approved replaceable computer insert protects computer tabs - Anodized Black with laser etched logos - Payload Capacity: Top 123g / Bottom 242g with combo adapter - Weight: 47g - Mount Type: Clamp 31.8mm - Mount Weight: 47g Compatibly: - WAHOO BOLT and MINI (ROAM users choose MAX XL K13-4605) - Combo (GoPro-style light/camera interface) adapter compatible (K13-580-BLK sold separately)

An excellent choice for mountain, cross, and road cyclists who prefer to have the computer above the stem. - Far and away more advanced than the plastic options on the market - Boost Stem Mount is specifically designed to fit atop the shortest stems on the market today - The Gravity Cap replaces your existing top cap and is ideal for Downhill, Enduro, Gravel, Touring, etc - The mount replaces a standard 5mm spacer and is locked securely in place by the top cap compression system - Compatibility: Wahoo ELEMNT, Wahoo Roam, Wahoo Bolt, Wahoo MINI - CNC-machined aluminum for low weight and strength - Made in the USA with a lifetime warranty - Stem mount that is for short, steep stem angles boosting the computer up above by 1cm

- CNC Machined Aluminum - Combo Compatible (580 Add-On sold separately) - WAHOO approved replaceable computer insert protects computer tabs - Anodized Black with laser etched logos - Payload Capacity: Top - 123g / Bottom 242g with combo adapter - Weight: 50g - Mount Type: Clamp 31.8mm - Mount Weight: 53g Compatibly: - All Wahoo Cycling Computers- ROAM, BOLT, ELEMNT, MINI - Combo compatible (GoPro-style light/camera interface), K13-580-BLK adapter sold separately

At 32 Grams the Race Mount is 33% lighter than the “standard” Wahoo Mount. - CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface - Compatibility: Wahoo Bolt, Wahoo Mini - Fits Handlebars: 31.8MM - NOT GoPro Compatible - Anodized Color: Black - Made in Boise, Idaho, USA - Lifetime Guarantee against material or manufacturer defects. Damages due to abuse or crashing excluded. * Attention: ASSEMBLY BOLTS NOT MEANT TO BE REMOVED OR TAMPERED WITH AT ANY TIME. The torx head bolts are installed using a permanent thread-lock compound. Doing so will void all warranties. Please contact K-EDGE warranty manager Info@K-EDGE.com for questions or concerns. We highly suggest you follow the recommendations in the Sigma instructions that recommend use of the provided tether leash.

- CNC Machined 6061-T6 Aluminium, injection molded copolymer interface - Compatibility: Wahoo Bolt - Fits handlebars: 31.8mm - Mount Type: TT Bar 22.2mm

- CNC Machined Aluminum - Combo (Computer on top – light or camera underneath) - WAHOO approved replaceable computer insert protects computer tabs - Anodized Black with laser etched logos - Payload Capacity: Top - 123g / Bottom 242g on K-EDGE K13-580 Combo adapter - Weight: 60g - Mount Type: Clamp 31.8mm - Mount Weight: 60g Compatibly: - All WAHOO Cycling Computers – ROAM, BOLT, ELEMNT, MINI

- CNC Machined Aluminum - Combo Compatible (580 Add-On sold separately) - WAHOO approved replaceable computer insert protects computer tabs - Anodized Black with laser etched logos - Payload Capacity: Top - 123g / Bottom 242g - Weight: 63g - Mount Type: Clamp 31.8mm - Mount Weight: 53g Compatibly: - All Wahoo Cycling Computers- ROAM, BOLT, ELEMNT, MINI - Combo (GoPro-style light/camera interface) K13-4500-31.8-BLK

- For Integrated Handlebar (one piece) bar/stem - Pro-level mount with -7 degree articulation for custom computer positioning - Lifetime warranty. CNC Machined. Black Anodized - GARMIN approved replaceable computer insert protects computer tabs - Combo- Computer and GoPro style camera/light compatible - M5 hardware included. If a smaller bolt required, use an 8.4mm washer to ensure a secure fit. - Made in House. Boise, Idaho USA

The K-EDGE Garmin TT Mount is the most advanced Time Trial and Triathlon computer mount available. Featuring a twist-lock mechanism to lock your Garmin with confidence. The K-EDGE Garmin TT Mount’s aluminum design and its unique locking feature is by far the most advanced mount on the market. With traditional TT mounts for the Garmin computer, you have to either have enough room between the extensions to perform the ¼ turn “twist” or the computer has to be mounted above the extensions. - CNC Machined 6061-T6 Aluminum Platform, Injection Molded Copolymer Interface - Compatibility – 22.2mm diameter TT Extensions - Supported Computers – Garmin Edge 20, 25, 200, 500, 510, 520*, 800, 1000, and Forerunner 310XT - Made in Boise, Idaho, USA - Lifetime Guarantee against material or manufacture defects. Damages due to abuse or crashing excluded. *Garmin 520 is not compatible at this time.

- CNC machined 6016-T6 aluminum platform, injection molded copolymer interface - Compatibility: Wahoo Bolt, Wahoo Mini - Fits 31.8mm handlebars - Weight: 38g - Lifetime guarantee against material or manufacturer defects. Damages due to abuse or crashing excluded

- Compatible with Wahoo Roam computer - CNC machined aluminum - Includes lockable set screw, replaceable insert - Aerodynamic fit - 31.8mm clamp - Mount Weight: 48g

Lights, Camera, You Name it The Accessory Mount is a great solution for attaching your GoPro-style mount to your helmet, seatpost, handlebar, selfie-stick or just about anything else. The banded system offers easy attachment, the 270 degree rotation helps you position your camera so that you can get the shot every time, and the omni-directional breakaway feature will take the hit in a crash (possibly saving your camera equipment). With the Accessory Mount, your imagination is the only thing holding you back. Features - Omni-directional breakaway, 270 Degree Rotation

Mount your computer and GoPro action camera to Giant SLR Aero handlebars with this neat solution. (Giant Ride Sync computer mount tray required - available separately) Features - Handlebar extension mount compatible with Giant computers - GoPro compatible - Garmin computer compatible - Giant Contact SLR Aero Handlebar compatible - Aluminum alloy construction

- Cleanly integrated buttons for display-free handlebar controls. - Integrated battery and support mode indicator functions. - Walk Assist mode button for tackling steep hills. - Compatible with ANT+ and RideDash Plus displays. - Waterproof rating: IP67. - RideControl App compatible.

Garmin's Bicycle Mount Kit lets you attach any compatible Garmin to your bike's handlebars, so the data stays out in front where you can see it.

Protective Silicone case for Edge 1040 and 1040 Solar

Mount your Varia Rearview Radar or Varia Smart Bike Light (each sold separately) to the seat post of a second bike with this quarter-turn mount. Includes mount and 2 fitting shims.

Mount your Varia Rearview Radar or Varia Smart Bike Light (each sold separately) to an aero or round seat post with this quarter-turn mount. Includes mount, 2 fitting shims and 4 O-rings.

- USB-A Edge Power Mount Cable - 400mm

Stay ahead of the pack with this extended out-front bike mount that lets you take full advantage of your Edge without compromising your ride. This mount with extended arm allows you to stay in a comfortable heads-up position for easier monitoring and improved safety.

Stay ahead of the pack with Garmin's Out-front Bike Mount that lets you to take full advantage of your Edge's capabilities without compromising your ride. The mount positions your device for easier monitoring and safety. Also compatible with the Forerunner 910XT and 310XT when used with a quick-release kit (sold separately).

Monitor your speed and cadence as you ride with these easy-to-install wireless sensors. With no magnets or other exposed parts to line up, these sensors are easy to install, maintain and move between bikes. The speed sensor 2 attaches to the hub of either wheel and self-calibrates with your Edge cycling computer or compatible Garmin device to give you accurate speed and distance at all times — even without a head unit. The cadence sensor 2 fastens to any size crank arm and measures pedal strokes per minute so you can get the most out of your training. Send live speed, distance and cadence data to compatible training apps or displays by using ANT+ connectivity and BLUETOOTH Low Energy technology. With both of these sensors on your bike, you can work to improve your personal best or see where you stand against the pros.

Computes and Transmits Meaningful Data - Computes and sends 6 running dynamics metrics to your compatible device - Battery life: replaceable battery lasts up to 1 year (assuming 1 hour daily use) - Automatically turns itself on and off - Tiny size: at less than 0.5 ounces, you'll forget it's there - Compatible devices connect with the Garmin Connect Mobile app to automatically sync your data and connect with others Train Hard, Run Free The Running Dynamics Pod easily clips onto your waistband to measure the running dynamics you need to beat yesterday. It gives you the option to run without a heart rate monitor chest strap. Once paired with your compatible smartwatch, just clip it to the back and center of your waistband and start your run. Review Your Form View and analyze important running metrics such as your cadence, stride length, ground contact time and balance, vertical oscillation and vertical ratio. These biomechanical measurements can help you understand your running form so you can perform better on race day. How It Works: The Running Dynamics Pod has an accelerometer in the module that measures torso movement to calculate these 6 running metrics: - Cadence is the number of steps per minute. It displays the total steps (right and left combined). - Ground contact time balance displays the left/right balance of your ground contact time while running. It displays a percentage. For example, 53.2 with an arrow pointing left or right. - Stride length is the length of your stride from 1 footfall to the next. It is measured in meters. - Vertical oscillation is your bounce while running. It displays the vertical motion of your torso, measured in centimeters for each step. - Vertical ratio is the ratio of vertical oscillation to stride length. It displays a percentage. A lower number typically indicates better running form. - Ground contact time is the amount of time in each step that you spend on the ground while running. It is measured in milliseconds.