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Fork Rake...4.0 or 4.5(4 posts)

Fork Rake...4.0 or 4.5LemondFork?
Aug 9, 2001 8:38 PM
I have a 55 Lemond Zurich what fork rake should I get for it? 4.0 or 4.5? How can I determine? It has a 4.3 now, but I want to go threadless. Thanks
Kevin
re: Fork Rake...4.0 or 4.5Cliff Oates
Aug 10, 2001 5:40 AM
I would stay with forks that have the same rake as the one on the bike now. Reynolds, Profile, Kestrel, Time, Columbus, and probably other manufacturers all offer carbon forks with threadless steerers of various materials and a 43mm rake.
re: Fork Rake...4.0 or 4.5EN
Aug 10, 2001 10:23 AM
The answer to your question can get a little complicated. Steering characteristics are affected by both the rake and trail of the front end. In general, more offset results in less trail which will quicken steering. The bottom line is that the 4.5 will handle a little faster than the 4.0. One problem with this simplification is that some forks are longer than others. If you change out your fork with a longer one, the steering head rake will slacken which will slow steering a little. If possible, check the fork length and try to match them as close as possible. Good luck.
74 degree head angle, go 4.0; less, go 4.5/TRAIL FORMULAclub
Aug 12, 2001 9:19 AM
{wheel radius (use 13.375" for skinny 700c) divided by tangent of head angle] minus {rake in inches (25.4 mm or 2.54 cm/inch for the mathematically impaired) divided by the sine of the head tube angle]=trail in inches. Best descending bike I ever owned was a couple of Dave Tesch customs, which had like 2.4 inches of trail which is more than normal. Got a calculator? Have fun comparing.