The CAAD12 fork that was mentioned, would it work with a long reach caliper like the Shimano R451?
No, it works with normal reach calipers...
Are there normal reach calipers that have that much clearance, though?
Long reach calipers don't have any extra clearance, they just have lower brake pads. The extra clearance comes from a longer fork and therefore the whole brake being higher. Hence the lower brake pads.
@exteroceptive started
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No, it works with normal reach calipers...