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Howard
How fat are the fattest tyres I can run on my Mavic Open 4 CD rims?
These: http://www.bikepro.com/products/rims/mavicroad-c.shtml
I believe Mavic would say 28mm is max but I've certainly done more in the past, although I'm aware there is a point at which it could/would be dangerous. But surely ppl used rims like this for CX back in the day and ran 30+ width tryes with no problems?
Planning a decent length ride in a few weeks mostly along toepaths and the current 25 width gators are gonna be mighty uncomfortable (I can switch to 28s but doubt it'll make a huge amount of difference). No issues with frame clearance. Could probably stick my 29er wheels in if I wanted to (although I'd have to lose the guards).