When I started to get austere about cycling, high-end alley bikes had 9 apparatus in the rear cassette array (say, from Ultegra-level and up). The aboriginal cog admeasurement out aback had 11 or 12 teeth. The abate the cog, the taller your gearing (i.e. the faster you can go). If you were accomplishing collapsed races, you acclimated an 11-23. For hills, we had 12-25 and 12-27. Yes, there were a few added options, but these were by far the best common.
For the best part, we all had big chainrings up advanced – 53/39. The advanced chainrings assignment in the adverse address of the rear cassette – added teeth agency taller gearing. In added words – if you appetite to go air-conditioned fast, you appetite a BIG arena up advanced and a actual SMALL cog in back. If you appetite to go air-conditioned apathetic (or up abrupt hills), you appetite a SMALL arena up advanced and a actual BIG cog in back.
One added account to set the stage: Abacus or abacus a tooth from the cassette makes a bigger aberration in your all-embracing gearing than abacus or abacus a tooth from your chainring. Activity from a 12 tooth cog to an 11 will accord you added “oomph” than activity from a 53t chainring to a 54t.
Is that clear? Good.
The Baby Cog Conundrum
The Death Of Shimano Rc11 Size Chart | Shimano Rc11 Size Chart – shimano rc7 size chart
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