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I'm a bit of an amateur but looking for advice at the moment.

My cassette is 11-26t which is pretty hard for me (not that fit).

I'm looking at changing to the 36t which I can see would be bigger, if so would I need a new derailleur system and gear lever etc.?

Thanks in advance.

  • Your rear derailleur needs to have the capacity and max cog size to support the new cassette. You'll probably also need a new chain. – Batman Jul 7 '17 at 18:18
  • ok thanks for the reply, should the gear changer be ok ? – garry Jul 7 '17 at 18:35
  • The shifter will be fine if the derailleur is fixed. If you change the derailleur you will need to check the derailleur and shifter compatibility. I'd suggest you go to a shop to do this, since it sounds like you won't have a chain breaker, cassette tool, chain whip and (the possibly needed) housing+cable cutters, aside from the know how for compatibility. – Batman Jul 7 '17 at 21:09
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    Uh, how about just changing the front chainring? – paparazzo Jul 7 '17 at 21:55
  • With a SRAM WiFli derailleur you can go up to 32 teeth, it has a longer cage. – Carel Jul 8 '17 at 10:37
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Since you're staying at 10 speed (ie, 10 different gears on the rear cassette) then you don't need a new shifter on the handlebars. That's a wise plan. If you got an 11 speed cassette you need also a new shifter, which gets expensive.

Your rear derailleur should be okay for the width, but the problems come about trying to clear that top gear. Its hard to tell if you'll get away with 36 tooth big gear, or whether your rear mech can only cope with a 34 or 32. My road bike takes nothing larger than a 28 tooth.

Do you have a short/medium/long cage rear derailleur?

As Batman says, you need a new 10 speed chain when you change cassettes. Worn chains slip on new cassettes and drastically increase wear.

Another thought - if you're not pulling top gear a lot then you can forgo the 11 tooth little cog and have a 12 or even a 13 tooth small gear.

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  • Well the length will be different is the main thing, not necessarily the worn part. – Batman Jul 7 '17 at 21:32

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