SRM zero offset

[singletrack]

Hi all , new SRM user here. I have a new PCV, whe doing the zero offset before each ride, should the upper and lower numbers be the same? I have a 500 on the bottom but the top only stableizes to around 644.

Thanks

[Brendan Quirk]

Quick answer: Yes. The numbers need to be the same - and the zero offset process should make them the same.

When the zero offset is done it essentially replaces the upper number with the lower one. Since this only takes a second or two to do, most folks do it every ride after noodling along for a mile or two in order to allow your PM to acclimate to the outdoor temps.

I vaguely recall seeing a thread on the Topica Wattage board about the impact in the +/- accuracy of your power based on whether you do a zero offset or not. It made for interesting reading and certainly spurred me to make sure to do it every ride unless it was just a coffee ride.

[Too Tall]

Agreed. You need to stop your bike and take ze feet out of ze pedals to do this. No extra weight on the pedals.

[EdK]

The crank must remain still as well.