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The USE chainring means you can use road cranks on a track bike, but it doesn't solve the problem of the auto-zeroing giving bad calibration results on a fixed gear bike. You need some way to turn off the auto-zeroing, which AFAIK was the only difference between the normal P2M spider and the track one - the track one had auto-zeroing disabled, which you can't do with the normal one.
These days I believe it's SRM or nothing for track crank-based PMs.
Brommers-
You need some way to turn off the auto-zeroing, which AFAIK was the only difference between the normal P2M spider and the track one - the track one had auto-zeroing disabled, which you can't do with the normal one.
Isn't auto-zero a feature of the head unit, not the PM? Or does P2M do some re-calibration of itself independently of the head unit that you need to turn off for tark?
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Ah, good point.
I'm pretty sure I saw the ability to turn off the auto-zero when I looked at the settings on my Quarq the other day.
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Please could you explain why this might be an issue for use in a velodrome or in a fixed tt situation with P2M? Shouldn't the p2m auto zero only when there is 2secs of no power which is unlikely to happen on a fixed? thanks
Howard
pifko
Goyt
Do this:
http://www.timetriallingforum.co.uk/index.php?/topic/124605-52t-use-track-chainring/
Unless you need the low Q factor...