Noob question regarding cassette sizing

macleod113

Hi all,

Does anyone know that if i change from an 11-25 cassette to an 11-28 or 32 if this will cause shifting problems?

will i just need to tweek the rear mech or wil it be fine?

Cheers for the no doubt obvious answers i'll get

smidsy

a 28 should be fine - you may struggle with a 32 without a MTB rear mech

drlodge

Should be fine, may need to lengthen the chain though - check for length in both small-small and large-large combinations.

Also see if you can get a 12-28 cassette, you won't need the 11T cog and a 12-28 will give you another intermediate cog that will be more useful.

hstiles

A 28 will be fine with a medium cage. Are you using a compact or standard chainset? I ask because there are very few scenarios where a 34 up front and 28 on the back won;tbe enough.

macleod113

Its a standard set chainset. think it would be best not to go beyond 28 tbh.

i do find it very easy in the big ring on the flats. would a 12t bring my cadence up higher by much?

Mad_Malx

MacLeod113 wrote:

Its a standard set chainset. think it would be best not to go beyond 28 tbh.

i do find it very easy in the big ring on the flats. would a 12t bring my cadence up higher by much?

11 to 12 is a 9% increase - so cadence from eg 100 to 109 (100*12/11 =109%).
12 should be enough as the smallest coupled with a standard big front (unless you are at pro level).

If you are in the 12 then you are better off the big ring up front anyway - and definately should be if that is the smallest cog.

hstiles

11-28 with a standard chainset gives you a very good range of gears - the big jumps occur in the three largest sprockets (21, 24 and 28). I run either an 11-28 or 11-25 (with a compact - I try and keep my cadence at 100+).