I have Tektro R539 calipers on my Pacer, currently running 35mm Gravelking Sk tyres, it's tight, but not scary tight.
35s definitely won’t fit my carbon fork, but the cromoly fork it came with is surprisingly spacious.
Will have a go with sram red calipers, got some duraace 7900 to try if they don’t work.
@Acliff started
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I have Tektro R539 calipers on my Pacer, currently running 35mm Gravelking Sk tyres, it's tight, but not scary tight.