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I wish to upgrade my bike with the "SRAM Force eTap AXS 2x12 Upgrade Set"; this set would include the derailleurs and levers. The thing is, my current Shimano Ultegra 11-speed crankset (FC-6800) has a left-sided power meter that I would very much like to keep.

What are my options? Will this crankset work with my new 12-speed setup and a 12-speed chain?

Also, can I keep my Shimano Ultegra rim brakes?

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SRAM road 12sp is interesting because they claim to have redesigned the chain with larger rollers than the chains most people are used to. For this reason it is entirely possible that the Ultegra chainset you currently have will work very poorly and lead to some damage. On other 12sp systems, it may work or it may shift less than perfectly but a normal (non-AXS) 12sp chain would run on it.

Regarding brakes, these will work. There are considered to be two types of road brake actuation -- Campagnolo/SRAM and Shimano. The reality is that you can use the Shimano brakes and they will stop you just fine and feel OK -- but at the lever the system won't feel exactly like SRAM intended. Groupsets are pretty tightly integrated nowadays -- it seems to be getting more so than less so. It does make changing over from one group to another much less easy than previous generations.

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  • Thanks! Actually I have a bit of a franken bike right now too. Older Force and Red derailleurs, Ultegra cranks, Force levers, and Ultegra brakes. Works great, but I see your point about things getting harder to mix. But anyways, I think I will hold out upgrading until I can get the new Ultegra Di2 groupset
    – Figaro
    Oct 19 at 17:23
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The SRAM 12-speed chain is narrower and is not compatible with the 11-speed rings on Ultegra, it won't be taken up by the teeth. Swapping the chainrings for SRAM rings is not possible either because of the shape of the rings. and the BCD for Sram is 107mm while it's 110mm for Shimano. You could try to resell the powermeter crankset.

Even if you could keep the callipers, of which I'm not sure, I'm afraid you'd need a new crankset as well.

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  • Ah, I was wishing the chain was narrower on the outside only, not the inside.
    – Figaro
    Oct 19 at 17:21

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