anyone have success?
I have a Quarq Riken BB30 and it is the most recalcitrant shift (from the 39 to the 53) i've ever encountered. i've even had the rings replaced for a new set yet the problem still exists. at best it's slow, and at it's worst it requires 2 or 3 tries to get it to shift.
in addition to this, when shifting from the 53 to the 39 and going down the rear sprocket at the same time, it will fall off the chainring to the inside. Campagnolo rings (and even Stronglight CT2's ) never did that.
It would be interesting to compare your different rings and their thickness, how the teeth are offset to one side or another, and if there are any countersinks at the bolt holes. There's no standard for these, or for crank arm thickness, so what you get when combining parts from different manufacturers is kind of a crapshoot.
I'll just add when I switched the rings, I didn't need to adjust my derailleurs at all. Everything matched up perfectly.
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The Praxis rings mimic the 11s spacing quite well and with a careful FD set up seem to work OK in many cases as noted by other users above.
Bear in mind though, it's going to vary with rear triangle length and also possibly with cassette sizes as the point on the cage that the chain is in contact with when you shift will vary with casette size; rear triangle geo can also affect this (seat tube - chainstay angles plus angle of chain relative to the rings and FD at the extremes) and differing ring spacings and ramps / pins can affect the reliability of the shift.
Campagnolo Main SC, UK
Head Tech, Campagnolo main UK ASC
what's odd is that this is the second frame (and second chain ring set) i've put this power meter on with the same issue. this present frame has a much shorter rear chainstay than the previous one (Cannondale Evo).
So you've tried the Praxis/Quarq combo on two frames, same results? This is odd, and I certainly hope you can figure it out.
Sounds like you need a proper front derailleur adjustment, or an improved front shifting technique.
The Quarq has little to do with this - and the Praxis rings should work reasonably well.
Assuming that there's not too much flex in the derailleur / braze-on, or a worn chain, likely a looser high limit and tighter low will show some improvement.
My Cannondale Evo was built from new with Record 11 and a Quarq Riken- new chain, Praxis rings, etc and despite the attentions of 3 different mechanics, has failed to shift smoothly. I had the rings replaced immediately with a Praxis warranty replacement set and althought it was better, it was but still not shifting well by any means. I sold the Evo frame, and transferred everything over to a new Litespeed C1R frame- same issue. Shoddy shifting.
Pondering this some more, I wonder if somehow your crankset is canted. Since you've had it in two different frames, it can't be there, but perhaps the spider or the bb is misaligned. Two tests would be to put the rings on another Quarq spider or to try a different bb. Also, have you tried putting the Praxis rings on your Quarq Cinco to see if they work there? Just thinking out loud...
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