Originally Posted by mickster
Really is impossible to say without lots more info - eg how long is the TT? How fit are you? What sort of time are you realistically aiming for? You need to be more specific about what you mean by wanting a 'better ratio' - what would you like to change about the 42x14 you used before (eg was it too heavy a gear or were you spinning out too early).
FWIW the one and only time I did a TT on fixed was a 10 miler, on a conversion with regular road bars, spoked wheels, on a flat but windy out-and-back course and I used a 44x14 (ish). I did something in the high 23 minutes (hey I never said I could TT...
) and this gear was about right for me. Based on that, your 42x14 sounds closer to the mark than the 50 etc you mention...
mickster
I knew I left out a bit of information.
It's a 10 mile course. The best I've done on this course was earlier this year with the geared 50x12, and I ended up with a 23:17. I've had some ups and downs since then, a 23:33 at the end of August, and then when I did it at the beginning of september with 42x14, I had like a 26:30, and I was spinning out the whole way. well over 90 rpm (and sitting on the bullhorns without aerobars the whole way)
I'm pretty fit, I'm not sure what kind of scale I could give you to gauge that on though. What I really want something below 23:00, but I don't know if that'll be possible now.