tyre for b31

[Derek996]

I have a 21" WM1 rim on my ZB32 with a 2.75" tyre which I think is correct for that rim..

[limeyrob]

I agree, I'm looking at something similar for the front my my Matchless G3CS.  Is that a trials pattern tyre?

[V500]

I have a ZB32 with a 21" front wheel with 7" brake. I recently bought a 3.00" trials pattern tyre and I'm glad I did as even the 3.00" looks small.

[Derek996]

I agree, I'm looking at something similar for the front my my Matchless G3CS.  Is that a trials pattern tyre?

Yes, a Heidenau K67