Used them on my old Cross Check with 35c tyres/45mm chromoplastics, rubbed the guards a little but didn't affect braking.
Did you have the guards pretty close to the tyres?
Around 10mm clearance around all part of the tyre, like I said, it did catch/rub but didn't affect braking or guards in a detrimental way.
@sorethroat1 started
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Used them on my old Cross Check with 35c tyres/45mm chromoplastics, rubbed the guards a little but didn't affect braking.