Swapping chainrings on a Quarq

DaveyL

What are the obstacles to swapping chainrings on a Quarq powermeter? Is it simply the fact that standard, compact and MTB chainrings are different BCD measurements? i.e. it's a physical limiter. Or is there a calibration issue that it's impossible to overcome?

Ideally I'd like to use the Quarq across road, 'cross and mountain bikes, with at least 50/34 (road and cross) and 39/26 chainrings.

estampida

The sensors are hidden inside the crank, so any chain-rings can be used (is that right, just a quick google to make sue there is not anything funny in bb..)

Middleburn hardcoat are my recommendation on chain rings, they manufacture all sizes and bcd, and are UK based but not cheap......
http://www.middleburn.co.uk/chainrings.php


but some company's are using very stylised cranks to force you to use sram or what not..... trying to stop an open market..... ffs.....

Herbsman

DaveyL wrote:

standard, compact and MTB chainrings are different BCD measurements

Yes.

Apparently they are susceptible to increased zero offset drift after chainring changes - grease the bolts first (threads and the contact points too) to help reduce this.

DaveyL

thanks for the replies, guys. It looks like it *could* work in theory if you got chainrings with the same BCD, and checked the calibration.

Alex_Simmons/RST

http://www.quarq.com/ring-difference

DaveyL

Thanks all!

DaveyL

Just to note that yesterday Quarq announced two new models of powermeter, the ELSA and Riken. These both feature the OmniCal system, which Quarq claims allows you to swap chainrings without recalibration (others on this forum more knowledgeable than me will be able to comment on how accurate this is).