I've run 38's under PB Hybrid(45mm) fenders with no probs. 40's would be close. My Big Buzz has 32's under 35mm Hardcores,and they're real close to the edges and I've noticed a fair bit of spray getting around them(I'm going to swap them for some wider ones when I get the chance).
Just remembered. SKS makes alot of different sizes,if you're not set on PB. I've got a set of like 50mm SKS's I was going to use on a bike that was running 42mm tires.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line
Last edited by dynaryder; 12-11-09 at 01:45 PM.