Originally Posted by
Mogens
It's weird, I'm seeing conflicting reports on whether the 45mm SKS fenders will work with 38mm tires, I guess there are too many unknowns. I guess I'll just try to order some with a generous returns policy!
The packaging from my fenders says they're compatible up to 38mm. They're flexible, so letting out the stays a little will give a wider diameter, more than enough for a 38mm tire. Coverage over the sides of a 38mm tire won't be as good as with a wider fender, but acceptable for me. I wouldn't put a 42mm fender over a 38mm tire. I think you could squeeze a 50-52mm fender in the frame and fork. Just check how much room you have in front of the rear 38mm tire of your choice. It might get pretty tight.
Here's some closeups of my install if it helps:
https://www.bikeforums.net/commuting...l#post20690952