Has anyone gone through the process of changing the programming in a Steps system so it recognizes smaller tires? If so, can I please get a brief overview of what needs to be done? My bike shipped with 26 x 2.00 tires and I'd like to switch to 26 x 1.5, and I want the speedometer and odometer to remain accurate.
Shimano Steps running smaller tires
- Thread starter emco5
- Start date
... The speedometer is set for the diameter of the wheel and since the diameter of your wheel remained at 26 inches no change is necessary. The 2.00 and 1.5 refer to the width of the tyre and while this affects roadholding and friction, it doesn't affect a speedometer. The speed of the bike is calculated by counting the revolution s of the wheel and dividing by time.
Thank you for the feedback. A 1.50" tire has a shorter aspect ratio than a 2.00" tire, and the resulting reduced circumference will make the wheel turn more revolutions per mile. This can be observed with a 'rollout test'. Sheldon Brown produced some good info on the subject https://tinyurl.com/kzo28of
how about mentally subtract 3% to account for 1.5" tyres?
Treat 10.3 miles on the LCD as 10 miles when on 1.5" tyres.
Treat 10.3 miles on the LCD as 10 miles when on 1.5" tyres.
Select a route of of at least two miles that's as straight as possible and ride it on the present tyres, noting the exact distance reading.
After changing the tyres repeat that route riding in exactly the same manner, speed etc, noting the distance.
Then turn the difference into a percentage and apply that percentage difference to your wheel dimension setting.
That's what I do and I have a set 4.9 mile route for the purpose.
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After changing the tyres repeat that route riding in exactly the same manner, speed etc, noting the distance.
Then turn the difference into a percentage and apply that percentage difference to your wheel dimension setting.
That's what I do and I have a set 4.9 mile route for the purpose.
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... According to that website the difference is around 3% , and will depend on inflation, brand , weight on bike, age of tyre. And probably even the weather and your altitude. I am tempted to say get a life. It doesn't change the distance you have to travel, the likely hood of being caught for speeding .
To put it into context there is a constant 10% discrepancy between the distance travelled and the posted speed on my Peugeot 3008.
Interesting attitudes from you fellows. It appears that you haven't "gone through the process of changing the programming in a Steps system". So, I apologize for the apparent technical overload and will leave you to yourselves.
Any update on this. I recently had my 6000 motor replaced under warranty due to some play in the cranks and I've noticed that with the new motor the distance readout on the computer is now greater than it used to be for the same journey. This leads me to suspect that the wheel circumference is set too large.
It wouldn't bother me except that it now means that the power is assist cutting out at a lower speed because it thinks it is already at 25kmh.
I stood with the mechanic in the bike shop with bike hooked up to the computer using the E tube project software and there didn't seem to be anywhere to set the wheel circumference.
It wouldn't bother me except that it now means that the power is assist cutting out at a lower speed because it thinks it is already at 25kmh.
I stood with the mechanic in the bike shop with bike hooked up to the computer using the E tube project software and there didn't seem to be anywhere to set the wheel circumference.