Joined: Feb 2012
Posts: 19,352
Likes: 5,470
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
A very close measurement of rake with the fork still on the bike is to measure from the BB shell to the ft axle (obviously the wheel has been removed...), write this amount down. Now spin the fork around 180*, so it's backwards. Remeasure from the shell to the axle and write that down. Add the two measurements and divide by 2.
Better is to remove the fork from the frame, support the steerer on a Vee block parallel to a flat surface and do two height measurements. One from the surface to the steerer's center (or top, or bottom if you also know the steerer diameter/radius) and the other from the surface to the axle center. Subtract the first from the second. Andy
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AndrewRStewart