Bicycle Mechanics - 52D chainring to 53 chainring

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Jquest
08-12-09, 03:12 PM
I have an Ultegra crankset. It's 6604 triple ice grey with a 52t-D chainring.
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FC/EV-FC-6604-G-2762_v1_m56577569830621037.pdf
Does anyone know if that is compatible with a 53B? I can't seem to find a 53D on their website or at least I couldn't find it.

DMF
08-13-09, 12:10 PM
There is no 53D. The letter designation notates that the shifting aids on the ring are set up in a certain way. You might get away with using a B alongside a D, but then you might not.

But why are you trying to do this? Do you want a taller gear? The solution is to change the cassette. (And if 52-11 isn't tall enough for you, learn to pedal faster.)
Al1943
08-13-09, 12:13 PM
Triple chainrings are designed as a matched set. It is possible to replace a single ring but the shifting won't be quite as well. I have a 53 and often wish it was a 52. 53 is overkill.

Al

JanMM
08-13-09, 02:35 PM
You could go retro and replace middle and large rings with non-ramped and pinned rings but that would be too much cost for very minimal value plus the shifting would be retro, too.