Cassette Size
07-21-21, 07:19 AM
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Cassette Size
Can I replace a 10 speed 11-28 with a 10 speed 12-27? My goal would be to do this without replacing the chain or chainrings because those are fairly new. I would assume the rear derailleur would need adjustment.
07-21-21, 07:33 AM
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Yes, but assume the chain will need replacement too as chains and cog sets both wear with use. Also always check der adjustment when any gear system part is replaced. Andy
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07-21-21, 07:35 AM
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Yes, it shouldn't need any other changes but there is a small chance the new cassette doesn't sit exactly the same distance from the hub so may need some minor limit screw and cable adjustment. Also possibly a B-tension screw adjustment but not likely.
07-21-21, 09:52 AM
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There's a very good chance you may only need a click or 3 on the barrel adjuster.
07-21-21, 10:39 AM
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Measure your chain with a tape measure or ruler.
If it is exactly 1/2" per link (12" per 24 links), then you are fine. If it is stretched, I'd go ahead and replace he chain too.
If it is exactly 1/2" per link (12" per 24 links), then you are fine. If it is stretched, I'd go ahead and replace he chain too.
07-21-21, 12:47 PM
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Fairly new doesn't really tell the story. Measuring the elongation does tell whether the chain should require replacing. 12" pin-to-pin. Greater than 1/16" elongation?
07-21-21, 05:20 PM
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The switch should need only the most minor limit screw and cable tension changes at most. But tell me, where did you get a 12x27 10-speed cassette? That was my favorite combination for years but they seem to have completely disappeared. I can find 12x28 and 12x30 but they both miss the 16T cog the 12x27 has.
