Bicycle Mechanics - ? S-Works chainring change to compact 50/34??
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I recently purchased a Sepcialized 2011 Tarmac s-works, new left over. It presently has a 54/39 s-works front chainring and i plan on chainging it out to a comppact 50/34 . LBS cant get the s-works compact 50/34 chainring and recommends i go with a SRAM red compact 50/34. All other components are SRAM red . My question is will the SRAM front chainring effect the shifting quality ...Rear cassette , derailuers are all SRAM RED too. Cranks are s-works. Any tips, advice .....comments would be greatly appreciated. Thanks!
10-13-11, 02:56 PM
Compact cranks have a 110 mm Bolt Circle Diameter (BCD) and standard cranks have 130 mm. The smallest ring that can fit on a standard road crank is 38 teeth, and the smallest on a compact crank is 34 teeth. So, to go compact chainrings, you need a new crank.
A good compact crank like the SRAM RED will shift just as nicely as a good standard crank (probably as well as or better than the s-works, which will be a relabeled FSA or something), with the caveat that the front derailleur should be set up correctly. There are "compact specific" front derailleurs, but I never could tell the difference- normal derailleurs work just fine for me.
10-13-11, 03:01 PM
The Red chainrings have a reputation for not very good shifting, although I think they are ok but not great. But the Specialized chaingrings have the same reputation. So I am not sure you are losing much by going to Red.
If it was me I'd look harder for a compact spider to go on the Specialized cranks. Red is perfectly acceptable (I have one) but I like the Specialized crank design.
unfortunately its out of stock. Specialized seems to be lousy for parts support lately. Try calling around to dealers to find one.
Thanks for the info....appreciate it.
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