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Best way to measure fork rake?(6 posts)

Best way to measure fork rake?homegrown2004
Apr 3, 2003 4:58 AM
What is the best way to measure fork rake when the fork is not attached to a bike? Been looking all over the web but could only find motorcycle stuff. Thanks.
re: Best way to measure fork rake?Quack
Apr 3, 2003 2:20 PM
Flat surface(table), block of wood, ruler. Place the block of wood on the table, place the steerer parallel to the table on top of the block of wood and make sure that the only thing touching the wood is the steerer tube. Making sure the fork blades are parallel to the table and the steerer against the block, place a ruler perpindicular to the table behind the fork blades and look between the dropouts to get a center measurement. Once you have the measurement, subtract both the block of wood thickness and one half of the thickness of the steerer and you should have your rake. Not sure if it's the best way but it sure is cheap.
its kinda hard to talking mm here!nmthe bull
Apr 3, 2003 3:51 PM
generally the right idea...C-40
Apr 3, 2003 5:44 PM
There are additional requirements. The axle holes must be absolutely parallel to the table or the measurement must be taken with the an axle mounted in the fork, at the center point between the dropouts to minimize error.

You need a finely graduated scale, preferably a machinist's scale to minimize error.

When you consider that most forks are in the very narrow range of 40-45mm, the chances of getting the correct number aren't great.

If you have a local machine shop, they would put the steerer in a V-block on a granite table and use a height gage to give you the answer in a few minutes.
Refined techniqueNessism
Apr 3, 2003 10:38 PM
Go to Lowes or Home Depot and buy a short piece of machined hardwood. They have some very accurately machined 2" x 2" x 12" pieces that will work perfectly. Next, place a front hub axle in the dropouts - now is a good time to service that hub you've been neglecting! Just take your ruler and site to the center of the axle hole. Measure up on both sides of the fork and make sure the measurement is the same - this will assure the axle is parallel to the surface plate.

Good luck.

Ed
Thanks for the info guys! nmhomegrown2004
Apr 4, 2003 8:50 AM