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Sizing a Threaded Fork(4 posts)

Sizing a Threaded ForkVW
Jul 12, 2001 3:40 PM
I like upgrade to a threaded Kestrel carbon fork currently on sale for $120, but I'm not sure what size to buy. Can anyone tell me how to figure it out? I have a 54cm 1996 Trek 5000 with the original aluminum fork. Also, is the Kestrel carbon fork a good match for my bike?
re: Sizing a Threaded ForkSpoke Wrench
Jul 12, 2001 4:13 PM
Sizing a threaded fork, there are three things to consider.
1. The length of your bike's head tube.
2. The stack height of your headset. Unless you have a hyper expensive headset like a Chris KaChing, I'd get a new one and the stack height information should be available.
3. Spacers, if any, to raise your handlebar.
Add 'em all together and that's it.
measure the one you have...C-40
Jul 12, 2001 4:28 PM
Threaded forks only come in 20 or 30mm increments, with about 50mm of threading. All you have to do is get it long enough to cut to the exact length needed, but not too long, or you'll run out of threads. Use a tape measure and measure from the bottom of the headset to the top of the headset lock nut. Convert from inches to millimeters by multiplying by 25.4. Make sure the one you buy is at least that long, or not more than one size longer.

On a 54cm frame, it should require a 160mm. The head tube should be in the 110 to 120mm range, and the headset will add another 40mm. If the total length is over 160mm (6.3 inches) get a 180.
re: Sizing a Threaded ForkVW
Jul 13, 2001 1:45 PM
Thanks! That's not too difficult to figure out. Anybody out there know if the Kestrel EMS carbon fork is a good match for my 1996 Trek 5000? Trek 5000 is an earlier OCLV carbon fiber frame.