Home › Display settings › Shimano STEPS SC-EM800 / SC-EN600 / SC-EN500 (EP8/EP6 era, E-TUBE Ride app) › Shimano SC-EM800 / EP8: wheel size (dealer only)

Wheel circumference on a Shimano STEPS EP8/EP6 system with an SC-EM800, SC-EN600 or SC-EN500 display

Shimano STEPS SC-EM800 / SC-EN600 / SC-EN500 (EP8/EP6 era, E-TUBE Ride app)

Circumference is a drive-unit value, visible but read-only in consumer E-TUBE Project. A dealer changes it in dealer mode.

Step by step

  1. Compare display speed with GPS on a flat kilometre. More than 5 % off points at circumference.
  2. Measure the true rolling circumference in mm under load.
  3. E-TUBE Project on your phone: [Drive unit] shows the current value read-only.
  4. Take the bike and measurement to a STEPS dealer for the change.
  5. Verify against GPS afterwards.
Tip: Mullet setups (29 front, 27.5 rear): the value must match the rear wheel, where the speed sensor sits.

Can't find it?

Dealer says locked: some brands (Trek, Cube, Merida) lock it; only their service partner can change it.

Frequently asked

Can E-TUBE Project Cyclist change wheel size?

No, it is read-only in the consumer app.

Is a wrong value dangerous?

Not dangerous, but the 25 km/h cut-off and ODO will be off.

New tyres, speed reads low, is the sensor broken?

Usually not. The circumference changed. Have it updated.

Manuals and video

Other Shimano STEPS SC-EM800 / SC-EN600 / SC-EN500 (EP8/EP6 era, E-TUBE Ride app) guides

Shimano SC-EM800: switch mph to km/hShimano SC-EM800: set the clockShimano SC-EM800: reset trip distanceShimano SC-EM800 / EP8: customise assist profilesShimano SC-EM800: pair with E-TUBE Project / E-TUBE RideShimano SC-EM800 / EP8: firmware updateShimano SC-EM800 / EP8: walk assistShimano SC-EM800: 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.