Had Colin ream and face the headtube, then I took it home and installed headset and new fork, took new geometry measurements.
Old fork clearance
New fork clearance
However, using a longer fork with more tire clearance changes the rest of the bike geometry which affects handling and ride experience – sometimes for better, sometimes for worse.
Seat Tube is 71.7 degrees (was 72)
Head Tube is 72.3 degrees (was 73)
Bottom Bracket Drop is 74mm (was 80mm)
26.8 Seat Post
388mm Axle to Crown Measurement (was 375)
62mm Offset (was 50mm)
45mm Trail with a 32mm tire (40mm is the sweet spot – it started with 57mm).
Low trail but not as low as it could be. I think this thing is ready for initial build up – or at least good enough to start. Fork angle needs more work, load bearing brazeons added, and the canti posts in the rear need shaving off but it’s in the ballpark. I’m excited to have a big rubber low trail 700c bike.
More measurin shit pics in the set if that’s your thing
On a separate but related note,
I think I will build a measuring board for doing this kind of thing in the future. I’m going to run out of workbenches to draw on. :)