Blindguy

I'm planning on getting a new fork for my mercier kilo tt. its a 55cm but i don't know what size steer tube length to get since there is 165mm and 225mm at bikeisland. please help a brother out.

Understanding

will you be running threaded or unthreaded, cause, in the end you'll be cutting it down anyway.

Blindguy

i'll be running threaded.

PedallingATX

you need a threaded fork then, unless you are planning on getting your fork threaded at a shop or something. FYI, I just cut an inch off of my threadless steering tube and it was really easy. Just got the fork off the bike, by itself, and went at it w/ a hacksaw. Just mark a straight line around your steering tube then cut it. File at the end to make it smooth and put it all back together. Err on the side of caution (get a long one)

beethaniel

you need to measure the headtube of your bike (minus headset). then add the stack height of your particular headset (it should readily available measurement). add those two numbers and you get the length you would need for the new fork. since its threaded, you have to have threads down below that about an inch (2cm). so for a bike with a 13cm headtube, and a 2.5cm headset, you need to have a steerer tube at least 15.5cm to about 25cm, or as long as there are enough threads to put the headset together. most shops will not be able to cut any more threads on their, as the steel used in a headtube is almost as tough as the die used to cut. the dies are expensive and get worn out too fast for them to waste it on the fork. they usually just chase the threads with a chase tool, different than an actual cutting die. I live in San Francisco, bike mecca, and there aren't any local shops that can actually cut the new threads.