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Compact vs semi, what cassette

Sb4rlySb4rly Posts: 122
edited March 2018 in Workshop
Hi. Last year prior to a trip to the alps I fitted a compact chainset with an 11-28 cassette to my bike. I have now bought a semi compact for all year round riding and wanted to leave it on for the alps. Would a 11-30 on the back give me similar to the compact or would I have to go to a 32 and get a new rear mech etc to have the same ratios?



  • timothywtimothyw Posts: 2,482
    Pretty similar yeah, 36x30 is actually very slightly easier than 34x28.
  • londoncommuterlondoncommuter Posts: 1,550
    I love this site, everyone should have it saved as a favourite:
  • oxomanoxoman Posts: 11,183
    Cheers LC, easier than most to understand. Sb4rly, You could always go to a 32 and see if existing mech will cope. A lot of rear mechs will cope beyond supplier spec, it will give you a bail out margin if needed as well.
    Too many bikes according to Mrs O.
  • Sb4rlySb4rly Posts: 122
    Thanks guys.
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