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I have 49x15 on my track bike and have a spare 14 sprocket too - there is quite a big gap between those two so looking at getting another chainring option.
Am i better going with a bigger chainring and sticking to a 15 or a smaller chainring and going to a 14 at the back? Changing the sprocket will be quicker to do but is there an advantage to having a bigger chainring and sprocket?
And now for what i suspect is a stupid question - assuming im using the same chain with a bigger chainring (say 50x15) that will mean my wheel will be closer to the seat tube - roughly how much closer will this be? I've got less than a cm to spare so will this mean a new chain too?
Depending on tyre sizes the approximate GI for each setup using the sprockets you have is 49/15 = 85GI and 49/14 = 91GI. All within the realms of normality for the track. 50/15 = 87GI which isn’t so different from what you already have.
I think (and I’m remembering from a long time ago so I may be wrong) one extra/less tooth moves the wheel position 4mm.
Personally I’d keep the 15 and the 14 on a flip flop hub for different race types.
If you’re riding on the road and encounter hills then that gearing massive and you are a riding god.
It is just for track use so no hills other than the banking so im definitely no riding god! A flip flop hub would have been ideal but they are banned i think.
hmmmm, [url= http://www.velodromeshop.net/index.php?p=page&page_id=faqtech-wheel ]velodrome shop[/url] appears to agree with you. damn, possibly time to rethink my wheels and gearing for spring.