FWIW, I did a quick Cad sketch and the headtube angle changed .547° slacker with the longer fork based on a 1750mm wheelbase and 73° headtube initial headtube angle. Installing the longer fork would place the angle at 72.453°.
With both forks set at a 73° headtube angle, the trail dimensions are 61.00mm with the True Temper Alpha Q2 374mm crown to axle and 44mm rake. The Reynolds comes in at 49.49mm trail with 395mm crown to axle and 55mm rake.
Installing the longer fork at the new 72.453° headtube angle changed the trail to 52.99mm.
If you know inflated tire dimensions for various sizes these could be plugged in. I based everything off a front and rear tire OD of 700mm giving me a level ground/terrain basis.
Not disputing any of your comments, just took a moment to see exactly what is happening. Please others, if possible, please check my numbers.
PK
Last edited by PMK; 08-02-09 at 06:43 PM.