DI2 front shifting w/ non Shimano rings

[T.J.]

Anyone out there run DI2 with non Shimano chainrings? How was the shifting. I know they say the shifting is optimal w/ Shimano rings but I have a SRAM Quarq I would ideally like to run but not at the price of the smooth shifting that got me hooked on DI2 in the first place. Thoughts? Comments?

[vqdriver]

maybe i'm being ignorant, but can't you just move the rings over if the bcds are the same?

[Jawn P]

My shop sells about a billion Cervelos with Rotor cranks/rings and Ultegra DI2, no complaints. Go for it.

[FlashUNC]

I'd imagine you'd be fine.

[T.J.]

maybe i'm being ignorant, but can't you just move the rings over if the bcds are the same?

But ugly

[Louis]

But ugly

Agreed. That is hideous.

[T.J.]

Agreed. That is hideous.
No doubt it would function A1 but I can't get past the looks

[slidey]

Yeah, you're looking at SRM really if you want Power + Shimano throughout.

Going by a quick search the SRM looks fabulous: http://www.bikeradar.com/news/article/srm-adding-dura-ace-9000-for-2013-interbike-2012-35328/

No doubt it would function A1 but I can't get past the looks

[T.J.]

Yeah, you're looking at SRM really if you want Power + Shimano throughout.

Going by a quick search the SRM looks fabulous: http://www.bikeradar.com/news/article/srm-adding-dura-ace-9000-for-2013-interbike-2012-35328/

True but at 3100:eek: that ain't gonna happen for me

[vqdriver]

oops. never mind that suggestion. it indeed looks horrible.
tho the rotor arms don't help.

for all the love rotor gets, i'm surprised more people don't complain about those graphics.

[T.J.]

oops. never mind that suggestion. it indeed looks horrible.
tho the rotor arms don't help.

for all the love rotor gets, i'm surprised more people don't complain about those graphics.

I know I prob shouldn't be concerned with looks so much but this bike has such a clean build/look to it the franken-crank would ruin it

[vqdriver]

I know I prob shouldn't be concerned with looks so much but this bike has such a clean build/look to it the franken-crank would ruin it

nah man. we all care to some degree. there's nothing wrong with it.

[oldpotatoe]

Anyone out there run DI2 with non Shimano chainrings? How was the shifting. I know they say the shifting is optimal w/ Shimano rings but I have a SRAM Quarq I would ideally like to run but not at the price of the smooth shifting that got me hooked on DI2 in the first place. Thoughts? Comments?

First Di2 I installed was with Quark crank and it worked fine. Not the stiffness of Ultegra/DA hollow ring rings(and not the $ either) so if you are sprinting up a hill in the small ring and want to shift to the big ring, in the sprint, it may not be as clean but otherwise, it's fine.

[oldpotatoe]

Yeah, you're looking at SRM really if you want Power + Shimano throughout.

Going by a quick search the SRM looks fabulous: http://www.bikeradar.com/news/article/srm-adding-dura-ace-9000-for-2013-interbike-2012-35328/

Or Stages..about 1/4 the price of SRM with comparible accuracy.

[shovelhd]

Anyone out there run DI2 with non Shimano chainrings? How was the shifting. I know they say the shifting is optimal w/ Shimano rings but I have a SRAM Quarq I would ideally like to run but not at the price of the smooth shifting that got me hooked on DI2 in the first place. Thoughts? Comments?

I am about to find out.

[T.J.]

I am about to find out.

Ohhhh, please report back !

[shovelhd]

Sure. It's going to be a few weeks, though, as it is a custom setup, and I have to wait a few weeks until my first break in the racing season to install it. It's in the bench prototype stage now.

[poff]

I have rotor oval rings on rotor SRM and it works great with 7970.

[ColnagoFan]

I ran FSA rings forever on my Di2, on the Hollowgram cranks, no complaints here. If I were buying new rings now though, I'd do Praxis for sure, best ring tech out there.

[10-4]

Or Stages..about 1/4 the price of SRM with comparible accuracy.

We define "comparable" differently. You don't actually believe that, right?

[10-4]

Been using Di2 (7970, 6770, and now 9070) with Rotor Quarq and Cannondale rings. Works fine, though I'm guessing the Cannondale rings are about the flexiest of rings on the market.

[oldpotatoe]

We define "comparable" differently. You don't actually believe that, right?

I do believe the 2% accuracy from Stages, when compared to the $veryexpensive SRM.

[10-4]

I do believe the 2% accuracy from Stages, when compared to the $veryexpensive SRM.

"±2% accuracy of strain gauge measured power". Very different than "2% accuracy". That's also "claimed", not at all what I am seeing reported.

[firerescuefin]

Read pezs write up...heck shoot him a pm. They look and perform awesome on my rotor quarq. Stiffest/best rings I have run:)

[10-4]

Read pezs write up...heck shoot him a pm. They look and perform awesome on my rotor quarq. Stiffest/best rings I have run:)

I've also heard great things about Praxis. I ran WickWerks on my Rotor Quarq for CX season, they shifted incredible.

[ColnagoFan]

Read pezs write up...heck shoot him a pm. They look and perform awesome on my rotor quarq. Stiffest/best rings I have run:)

This.
I'll only buy Praxis replacement rings from here on out, their DA7900 kits are about as clean as you can get with non-Shimano rings.

[oldpotatoe]

"±2% accuracy of strain gauge measured power". Very different than "2% accuracy". That's also "claimed", not at all what I am seeing reported.

Believe what you wish. Stages is a good product, accurate and not the big dollars and questionable reliability of other systems. I have had to send one guy's SRMs back to Colorado Spring 3 times for 'calibration'.

PLUS another that was a MTB one, BUT with a 44t big ring, on a XTR system, direct mount FD..that would not work with the 44t big ring...a call to SRM and they said, 'yep, that's a problem', and advised a 10 by 2 instead of a 10 by 3..in spite of the fact he already spent the $3000 for the crank. Finally found a 42t that would fit their goofy spider.

Power is mostly relative anyway, when used for training, not just 'max' numbers. But if ya like SRM, groovey.

[10-4]

Believe what you wish. Stages is a good product, accurate and not the big dollars and questionable reliability of other systems. I have had to send one guy's SRMs back to Colorado Spring 3 times for 'calibration'.

PLUS another that was a MTB one, BUT with a 44t big ring, on a XTR system, direct mount FD..that would not work with the 44t big ring...a call to SRM and they said, 'yep, that's a problem', and advised a 10 by 2 instead of a 10 by 3..in spite of the fact he already spent the $3000 for the crank. Finally found a 42t that would fit their goofy spider.

Power is mostly relative anyway, when used for training, not just 'max' numbers. But if ya like SRM, groovey.

Sounds like your guy should have checked compatibility BEFORE dropping $3k on a crankset. Not sure why I'd put that on SRM's shoulders. In my dealings with SRM, I wouldn't have hesitated for a second to return the SRM for the correct one. Their customer service has always been awesome, and if you couldn't use it I can all but guarantee that they would have taken it back.

I do like SRM, but I own Quarq systems 2:1 to SRM.

But you're right, ride whatever you want. Just make sure you're sharing correct information.