It's real tight. I guess you can go up to 25 safely, any more than that couldn't say without testing
Cheers. My Corsa 25mms hit nearly 29mm on my 19mm internal rims. I think they come up a bit big anyways.
For what I've seen wheel diameter could be the biggest concern, so maybe you'll get away with it.
https://www.youtube.com/watch?v=8tb3RLqY9Xo
@croft started
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It's real tight. I guess you can go up to 25 safely, any more than that couldn't say without testing