Home › Display settings › Shimano STEPS EW-EN100 junction (no display) + E-TUBE Project app › Shimano EW-EN100: wheel size (dealer only)
Wheel circumference on a Shimano STEPS system with an EW-EN100 junction
Wheel size is a drive-unit setting and is read-only in the consumer app. Only a dealer in E-TUBE Project dealer mode can change it.
Step by step
- Compare app speed with a GPS app over a flat kilometre; more than 5 % off suggests a wrong circumference.
- Measure the real circumference under load in mm.
- Ask a STEPS dealer to enter the value under the drive unit in E-TUBE Project.
- Re-check against GPS.
Tip: After a change to a different tyre size, always have the dealer update the value; otherwise the assist cut-off and odometer drift.
Can't find it?
Field locked at the dealer: the bike brand locked it; contact that brand's service.
Frequently asked
Why can't I edit it in E-TUBE Project on my phone?
Consumer mode shows circumference read-only. It is a type-approval parameter.
Is the speed sensor at fault if the speed is wrong?
Rarely. A wrong circumference or a misaligned magnet is far more common.
Can I temporarily fix it in E-TUBE Ride?
No, Ride shows what the drive unit calculates.
Manuals and video
Other Shimano STEPS EW-EN100 junction (no display) + E-TUBE Project app guides
Shimano EW-EN100: pair with E-TUBE ProjectShimano EW-EN100: change and customise assistShimano EW-EN100: units (km/h vs mph) in the appShimano EW-EN100: firmware update via appShimano EW-EN100: walk assistShimano EW-EN100: lights on/off
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.