The trials ones on tartybikes.co.uk are very good but mostly 18t, the one I have on my polo bike comes in 16t and 17t too I think, if you want bigger then you're probably looking at a white industries one.
@snottyotter started
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The trials ones on tartybikes.co.uk are very good but mostly 18t, the one I have on my polo bike comes in 16t and 17t too I think, if you want bigger then you're probably looking at a white industries one.