not to totally thread jack this but.... im thinking of changing my front to a 15t. the chain has about 3k on it, but isn't showing stretch(reading the swing arm label) and i know this is supposed to be a no go, change the whole set-up. question is has anyone ever changed just the front and not the chain and rear?
Changing just the chain or either of the sprockets singularly is not that big of a deal so long as the wear on the other 2 items isn't noticable. With only 3k on the chain, the chain should still be next to new. If the sprockets only have 3k, they should be in excellent shape as well. However, if the sprockets are older than the chain, the sprockets should have been inspected for wear during the last chain swap. If the sprocket(s) are currrently showing some wear, then I advise on chaging out the worn sprocket(s) now before they cause unever wear on the chain. :twocents
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Mass is your worst enemy, skill is your best weapon.