Looks like the bike came originally with Michelin 2.2 Wildgrippers.
The 2.3 I've currently got on there is pretty tight although there is clearance. I think anything above 2.3 would be risking some nasty frame damage.
I'll post a closer pic up shortly to show what I mean
The 2.3 I've currently got on there is pretty tight although there is clearance. I think anything above 2.3 would be risking some nasty frame damage.

I'll post a closer pic up shortly to show what I mean