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How much clearance between brake rotor and fork blade?

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How much clearance between brake rotor and fork blade?

Old 12-18-21, 08:34 AM
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How much clearance between brake rotor and fork blade?

Sorry, just wanted to ask this group about it. Most every metal disc compatible fork I've ever owned has a dimple or flattening to provide clearance. A recent mass-produced frameset I bought doesn't have any shaping and the rotor is less than 1mm from the alloy fork leg.
Frankly I don't feel like that's particularly safe, but I've become very cautious in my old age.
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Old 12-21-21, 04:52 PM
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This is from the SRAM Frame Fit guide. Seems to imply around 4.06mm from inside of the brake mount including the thickness of the rotor (which this doc specs in a different section as 1.85mm). It doesn't seem to show spec for clearance to frame/fork structure. I think it's probably a personal safety judgement call. 1mm is less clearance than I am comfortable with. 2mm would be fine. It's a pretty small window. The rear measurements according to SRAM are larger.

Would a smaller rotor help or be possible?

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