I currently have a 53/39T with 170mm arm Record 10 Speed. Would I have shifting issues if I replaced it with a 50/34T with 170mm Super Record 11 Speed crank?
I just swapped the cranks on my bike like you want to do, except I went Chorus to Chorus. Honestly the easiest swap I have ever done. The only negative is the crank says 11 speed on it, and my bikes a 10 speed, but I got over that in less than 11 seconds.
OP wants to switch to SR. The bottom brackets are actually different with the newer versions of the SR BB. The old ones were identical except for the seals. The good news is the new ones will still hold the seals if you transplant them from a non-SR BB. You can run the SR ceramic bearing crank with seals. I have done this for 4 years now.
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