Plays in traffic
Join Date: May 2006
Location: Rochester, NY
Bikes: 1996 Litespeed Classic, 2006 Trek Portland, 2013 Ribble Winter/Audax
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I like my SKS P35 fenders. They're much, much nicer than Planet Bike's Freddy Fenders, which I have on last winter's bike. That said, Planet Bikes Cascadia's seem different enough that I'm going to try them out.
My 28mm three-season tires work best in the 35mm fenders. My 34mm CX and 35mm studded snows work in them, but there's some spray out the sides. Wider fenders would solve the problem, which has provided the excuse to try the Cascadias.
As for clearance, your "hard points" will determine that. Between the front brake, the chainstay and seatstay bridges in the rear. Figure at least a half-inch, preferably more, in addition to the diameter of your largest tire, and whatever you need in width.
When I switch tires, I adjust the fenders up or down. I like them as close to the tire as possible to control spray. When I put the larger tires on, they would rub if I didn't move the fender.
Edit: Oh yeah, you're on a fixie. I'm sure there are other concerns with fenders when it comes to horizontal dropouts and changing the rear tire. There's a current thread around here somewhere asking about that. In Commuting maybe?