Bicycle Mechanics - Stumpjumper fork sizing
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08-22-08, 06:22 AM
I'm building up a MTB, based around a 1994 Specialized Stumpjumper frame. My LBS tells me I need a 1 1/8" fork, but I'm confused as to what this actually means.
Craigslist, eBay, and the BF for-sale threads are my parts sources. Will a 1" stem and 1" fork work in this frame? They seem to be easier to find. I assume I'd need to find some sort of adapter, but I'm not sure how to measure all this.
08-22-08, 07:34 AM
the 1 1/8" fork mean the diameter of the steering tube (which goes into the head tube of the frame) is 1 1/8 " and nothing else will fit. The 1" fork will not fit because it to small. use a set of caliper to measure the steering tube.
08-22-08, 10:06 AM
I've never researched it but you may be able to buy an adapter to allow you to use a 1" steerer in the 1 1/8" head tube but I'd recommend against it. For a mountain bike I want as much beef there as I can get. Most modern forks have a 1 1/8" steerer, but some of the latest bikes have headtubes that start at 1 1/2" and neck down to 1 1/8" at the top. Hit up Craigslist and/or EBay and you should find plenty of forks to suit your needs. You probably don't need a fork with lots of travel either, maybe 110mm or so for your hardtail.
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