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A bigger size likely wouldn't solve this imo, the guards are actually a little too big, and therefore pinching together at the bridge and causing the rub. I've dremelled mine to sort it, but some sks guards (raceblades i think) come with bridge-bits cos they're designed for road bikes. I think @Ecobeard might have made one for his winter bike possibly
yoshy-
Not sure if it was the same 'guard but I had a royal fuckabodge with the rear on the Rourke.
I had to trim the guard back as @alialias say, then 'manually adjust' the plastic bridge mount to make it fit and take 25's.
Worked in the end and definitely added value, so its a solid investment in swearing.
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They were definitely too small to fit over the 28c tyres I had on originally. Even when not attached to the bike they barely fit over. Pinching from the frame might be the issue now that I've changed the tyres though.
Ecobeard
ltc
I've spent most of today trying to fit 35mm SKS bleumels to my Caad4. I think I should have gone for a bigger size, I had to swap the 28c tyres on there for 25c and I still can't get the rear to stop rubbing at the brake bridge. Might need to go down to 23c. Gave up so currently just have the front guard fitted.