Join Date: Jan 2008
Location: Beaverton, OR
Bikes: Kona Jake, Kona Jake the Snake, Kona Major Jake, Kona Kula, Ridley Excalibur, LeMond Buenos Aires, Pinarello Gran Turismo, Pinarello Montello, Trek 614, Austro-Daimler Team, Motobecane Grand Record, Schwinn Voyageur, Nishiki Olympic, Steyr Clubman
Mentioned: 36 Post(s)
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I don't think I agree with Knobster. There were a couple of races around here last year (Sherwood & Astoria) where being able to ride a hill that some other people were dismounting for got me a couple of extra places in the standings. I suspect that's mostly a beginner thing, because nobody in the upper cats were dismounting for those hills. For me, having a 30-25 gear at my disposal made all the difference.
Obviously, the course will dictate whether or not this matters for you. This year, I plan to use 50-39-30 front/12-27 rear gearing for a few races but 46-36 front/13-25 rear for most others.
FWIW, a 27-tooth cog with a 39-tooth chainring has slightly higher gearing than a 25-tooth cog with a 36-tooth chainring, while a 30-tooth cog with you 39T ring, would have slightly lower gearing than a 36T ring with a 27 -tooth cog.
Last edited by Andy_K; 07-31-10 at 08:57 PM.