Thinking of a crank based power meter, the Quarq Elsa 10R, would this be compatible with Chorus 11, I have an English Bottom Bracket. would I need to change the front Derailleur. Does any one have any real life experience.
Thanks for any help
Both cranks' Q-factor is spec'ed the same: 145mm, IIRC.
I measured Chorus at 145-146mm, and the Quarq/SRAM was maybe 0.5-1mm wider. Probably within manufacturing tolerance and surely Unnoticeable.
Chainrings have to be common standard 110mm or 130mm BCD. This rules out Campy 53/39 (135mm) or Campy compact, which has 1 bolt offset to a 112mm BCD position.
Previous generation Quarqs were very sensitive to chainring flex, and Quarq maintained a list of "supported" rings at their website.
New generation Elsa & Riken are supposedly much more tolerant ("Omnical" feature) of chainrings. Officially Quarq supports only SRAM rings, but other sources indicate most other chainrings will work fine, although a recalibration is probably a good idea.
Additionally, an experienced usear at Wattage forum (Tom Anhalt, i think) states for best results after changing or replacing rings,
- apply friction paste to the interface between rings & spider.
- only use steel chainring bolts (came standard on my Quarq Riken).
- torque to 10-12 N-m in a criss-cross sequence.
- do several hard, all-out starts, in both small and big rings.
- re-torque, as above.
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