Originally Posted by
FBinNY
I hope your tongue is firmly in your cheek, and that you're careful not to bite it.
2mm change in front height vs 1,000mm wheelbase, so we're looking for a change in angle = to one with a sine of .002. This is roughly 1/10 degree, hardly worth thinking about. (I couldn't find a sine table for angles less than 1°)
Anyway, if the OP takes my advice and uses a larger tire in the rear than front, this would change the head angle more. (in the opposite direction). Maybe if he combines both the bike will retain the original geometry.
I stand corrected. I was thinking of the change from 27" to 700c I made on a frame I was also having cut for S&S couplers. The frame builder insisted on building up the crown race seat of the new fork to keep the top tube level. Talk about ugly! That was more of a change, but still probably no biggie. My bad. Thanks for the gentle let down.