28s GP4Seasons on mine but it would easily take larger without guards - I reckon you could go to 32c with ease.
Yeah, I've run 28 Duranos so I figured bigger will work. Just waiting for a dry day so I can clean the bike and try out the 32 and 25 Hypers I bought. If the 35s don't fit I'll sell them on.
@MrSweary started
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28s GP4Seasons on mine but it would easily take larger without guards - I reckon you could go to 32c with ease.