I'm looking at getting a left side crank power meter and was wondering would the various shimano left cranks available with power meters fit with the existing Ultegra 6800 crankset I have? The 105 or even dura ace. Thanks
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We have quite a few similar questions. The answer is the same, the left crank is independent and the interface universal (among Hollowtech || cranksetes), you can mix various left crsnks freely.– Vladimir F Героям славаNov 1, 2020 at 23:30
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1This one has 105 and Ultegra bicycles.stackexchange.com/questions/60274/… Another similar, but there are more bicycles.stackexchange.com/questions/24798/…– Vladimir F Героям славаNov 1, 2020 at 23:31
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Is the Q-factor any different between models and generations? I would expect Shimano to have slightly tweaked the Q-factors (perhaps narrower for race-oriented DA etc)– MaplePandaNov 2, 2020 at 0:27
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@MaplePanda IIRC, the reported Q-factor and chainline should be identical among the road Hollowtech II cranksets. GRX (gravel groupset) have 2.5mm wider chainline, and slightly wider Q-factor also.– Weiwen NgNov 2, 2020 at 3:20
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@WeiwenNg the GRX chainsets are 3.4mm wider chainline, according to the Shimano specs. However the FD is 2.5m wider. No idea why. Q-Factor is 5mm more.– thelawnetNov 2, 2020 at 11:04
1 Answer
Yes, you can use the left crank arm of your choice from the Hollowtech II road series. (105, Ultegra, DA)
It is quite commonly done, especially using a newer generation arm on an older chainset where the older style is no longer available.
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Yeah, you can mix+match according to the Shimano compatibility chart. The 11s Ultegra + 105 left cranks are hollow forged whereas only the 105 drive side crank is hollow forged. Bonded cranks have a history of cracking+breaking. So I use a Frankenstein Ultegra left side + Stages power meter, 105 drive side and Dura Ace rings.– OlsonistApr 1, 2021 at 15:31
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I have never seen these bonded cranks break. What kind of animal are you @Olsonist ?– NoiseApr 1, 2021 at 19:50
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I'd hardly call that a worry especially in the context of Shimano replacing it even out of warranty plus was clearly damaged for some time before obvious failure. Don't live your life in fear.– NoiseApr 2, 2021 at 16:31