Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 2 Post(s)
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Most threaded replacement forks have about 2" of thread. A typical headset and spacers needs something less than 1" or thread. That means you can buy a replacement fork slightly taller than yours and trim it without needing to extend the thread (which adds new problems0.
The dimensions you need to be concerned with are total length which has to be longer than yours, and the thread length. The unthreaded length (overall - thread length) has to equal your old fork's overall length less one to two inches.
BTW- many replacement forks are sold with tall steerers, with 4-5" of thread. This excess thread length can be a problem, (unless you're cutting it off anyway) because if you have more than 2" of thread the stem might not extend into the unthreaded area, increasing the risk of steerer breakage over time.
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Last edited by FBinNY; 01-10-11 at 10:18 PM.