Quarq DFour with Rotor Q-Rings modification

Discuss light weight issues concerning road bikes & parts.
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lemkeg
Posts: 14
Joined: Sun Nov 20, 2016 9:38 am

by lemkeg

I recently bought a Quarq DFour powermeter which has a 110bcd Shimano 4-arm fitting for the chainrings. I wanted to put on the Q-rings I had from my previous bike which had Shimano Ultegra 6800 on there. So, also a 110bcd 4-arm fitting. I can't seem to fit the Q-rings on there. When the crank is installed, I can't get the rings around the battery pod. I also tried removing the crank but it still did not fit around the quarq spider. It is as if the Q-ring hole is not round, and the Quarq spider is round.

Has anyone managed to fit this combination of powermeter and rings? I contacted Quarq and ROTOR and they both said that I should modify the rings to fit on the Quarq. I am not very confident on my skill when it comes to modifying bike parts, so any input / pictures would be helpful.

Thank you

stormur
Posts: 1182
Joined: Tue Aug 12, 2014 3:50 pm
Location: FIN

by stormur

dremel is your friend. it is doable. I did it... just need to trim chainring on battery pod area. slowly, until it fits.
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)

lemkeg
Posts: 14
Joined: Sun Nov 20, 2016 9:38 am

by lemkeg

stormur wrote:dremel is your friend. it is doable. I did it... just need to trim chainring on battery pod area. slowly, until it fits.


Do you maybe have a picture? I don't want to ruin my Q-Rings :p

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MattC
Posts: 570
Joined: Tue Apr 11, 2006 12:17 pm
Location: Not where I said I was.
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by MattC

The dimension across the battery compartment is more than 110bcd, so you won't fit the chainring on without modification.

eins4eins
Posts: 36
Joined: Wed Sep 28, 2016 11:49 am

by eins4eins

I had the same problem with q rings and the quarq dzero. I removed the spider from the crank, but the housing of the battery still increased the inner diameter a little bit, so I took the flex and removed some material. no pictures, but I made a small drawing where to make the cuts.

Image

TroyG
Posts: 19
Joined: Wed Jun 18, 2014 7:58 pm

by TroyG

eins4eins wrote:I had the same problem with q rings and the quarq dzero. I removed the spider from the crank, but the housing of the battery still increased the inner diameter a little bit, so I took the flex and removed some material. no pictures, but I made a small drawing where to make the cuts.

Image

Would a person run into the same fitment issue with the QXL rings or the osymetric rings?

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eins4eins
Posts: 36
Joined: Wed Sep 28, 2016 11:49 am

by eins4eins

with the QXL you face the same issue

the osymetric rings have not material between the mounting holes, so no problem mounting them to a quarq powermeter.

TroyG
Posts: 19
Joined: Wed Jun 18, 2014 7:58 pm

by TroyG

eins4eins wrote:with the QXL you face the same issue

the osymetric rings have not material between the mounting holes, so no problem mounting them to a quarq powermeter.

THANKS.

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