Bicycle Mechanics - Skykomish Marble Point STI/Shimano
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12-07-08, 04:10 PM
I was hoping I could get some assistance. I am trying to get a bicycle fork for my Skykomish Marble Point STI/Shimano, but don't know how to go about measuring for one. The story is that I made the bicycle out of spare parts, and currently have a fork that is too long for the bicycle on there as well as a different kind of fork all together(it is a fork for road tires).
So, I was wondering if someone could tell me for certain that this is a mountain bike frame. And secondly, how would I measure for a new fork?
Thanks so much,
12-07-08, 07:29 PM
To pick out a fork, you need to know the following:
headtube diameter (if you had a fork installed previously, measure the outer diameter of the steerer tube to get this)
threaded or threadless (does the old fork have threads on the steerer tube?)
If threaded, headtube length so you can get the appropriate steerer tube length
crown height (determined by tire size and whether or not you want to mount fenders, not usually an issue with 26" forks)
brake type (cantilever/V-brake posts needed?)
rake (fork leg offset from steerer tube, not critical for casual cycling)
Judging by a quick Google search, your bike came with 26" wheels and was a MTB. In that case, you'll want a fork with cantilever/V-brake posts unless you are using disc brakes. Given that it was a 21 speed bike, it likely used a 1" threaded fork. All you should need to do then is measure your headttube and figure out what steerer tube length to buy.
There are plenty of cheap options here for forks: http://www.niagaracycle.com/index.php?cPath=105_261&sort=2a&filter_id=&sort=3a or you can probably find something very cheap used.
12-08-08, 08:11 AM
WOW. Thank you so much! You were a HUGE help!
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