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Ultegra/105 Rings(4 posts)

Ultegra/105 Ringskup
Jun 24, 2003 7:21 AM
I want to replace my 42 and 52 chainrings with a 39 and 53 on my 105 Triple but I have only seen Ultegra chainrings in this size. Are there 39 and 53 105 Triple chainrings available? If not, will Ultegra work with my 105 cranks.
Thanks
re: Ultegra/105 RingsRusty Coggs
Jun 24, 2003 7:54 AM
Yes, ultegras fit,but the 39 won't be ramped like the 42 and may not shift as well. There may be aftermarket 39 rings with shifting ramps.Check www.branfordbike.com
Here's the dillio...Lone Gunman
Jun 24, 2003 6:17 PM
TA makes a 39t ring for a triple that is pinned and ramped that will work well but not identical to Shimano stock parts. Probably also make a 53 that is ramped and pinned. Check peterwhitecycles.com for info.

You will also need to swap out your front derailleur for a DA triple front derailleur. Huh? That's right, the 105 and Ultegra are meant to shift a difference of 10 teeth on the middle to big ring and 39 to 53 is 14t on a triple setup. Basically you want DA performance in ring sizes on a 105 budget, and Shimano got you there. Info courtesy of peterwhitecycles.
Well actually,Rusty Coggs
Jun 24, 2003 6:35 PM
The ultegra triple FD will shift a 39/53 ok. There just needs to be at least a 10 tooth difference between the middle and big ring.