Thread: Questions on shifter, derailleur & cassette compatibilty
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Old 10-27-22, 09:46 AM
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cyccommute 
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Originally Posted by anga
Hi

Two combinations.

Added: Shimano

1. 7-speed shifter, 8-speed cassette, 7-speed derailleur
Can above combo use 7 out of 8 cogs in the 8-speed cassette?
If you are using Shimano HG or SRAM 8 speed, the thickness of the cogs are close enough (1.85mm for the cog and 3.15mm for the spacer for 7 speed vs 1.8mm and 3.0mm for 8 speed) that they can work.

2. 8-speed shifter, 8-speed cassette, 7-speed derailleur
Will above combo use all 8 cogs in the cassette?

Thanks
Yes, that will work. For the derailer, the number of speeds doesn’t matter for 7, 8, or 9 speed for the derailer. Once you get to 10 speed, Shimano changed the pull ratio so that it won’t work with the lower number of speeds.
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Last edited by cyccommute; 10-27-22 at 11:50 AM. Reason: Incorrect on cassette id
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