What's my fork diameter? Giant Boulder Alu Lite
#1
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What's my fork diameter? Giant Boulder Alu Lite
I recently acquired a mid- to late-90s Giant Boulder Alu Lite. I am thinking of replacing the threaded fork for a threadless fork, in order to have more access to oversized handlebars. (All the lower priced stuff appears to be oversized.) Several posts i read gave me impression that the quill to threadless adapters are not really that great, which is why I'm considering the threadless idea.
I am having the hardest time figuring out the exact diameter of the fork steerer. It appears to be between 1 and 1 1/8th. It depends on the measurement points used. Many people claim most MTBs made after 1995 have a 1 1/8th fork diameter.Is there another way to verify? I don't have any spare forks to usefor comparison.
I checked Giant's website for manuals -- no luck.
Thanks!
I am having the hardest time figuring out the exact diameter of the fork steerer. It appears to be between 1 and 1 1/8th. It depends on the measurement points used. Many people claim most MTBs made after 1995 have a 1 1/8th fork diameter.Is there another way to verify? I don't have any spare forks to usefor comparison.
I checked Giant's website for manuals -- no luck.
Thanks!
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It's easy enough to confirm.
Forks are defined by the outer diameter of the steerer, which is typically either 1"or 1-1/8". The wall is almost always 1/16", so if you have a quill stem you can measure the diameter of the stem which is the same as the inner diameter of the fork. Add 1/8" for the two walls, and you'll have the fork size. ie. a 7/8" stem fits a 1" fork, and a 1" stem (actual, not nominal) fits a 1-1/8" fork.
Forks are defined by the outer diameter of the steerer, which is typically either 1"or 1-1/8". The wall is almost always 1/16", so if you have a quill stem you can measure the diameter of the stem which is the same as the inner diameter of the fork. Add 1/8" for the two walls, and you'll have the fork size. ie. a 7/8" stem fits a 1" fork, and a 1" stem (actual, not nominal) fits a 1-1/8" fork.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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Awesome, thanks. My stem is 25.4mm (1 inch), so that makes the fork 1 1/8.
Last edited by f33dback; 05-19-13 at 03:54 PM.
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Sure does, this opens you up to a big selection of theadless forks, headsets and stems.
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.
#5
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I'm not a fan of the threadless quill adapters. They probably work, but are a kludge that adds unnecessary weight.
When you go threadless with a new stem, fork, and headset you will not be disappointed. Just add up the cost of the parts first to make sure a mid-90s Giant Boulder is worth the money.
When you go threadless with a new stem, fork, and headset you will not be disappointed. Just add up the cost of the parts first to make sure a mid-90s Giant Boulder is worth the money.
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Don't think it's worth investing in a new threadless fork. I realize the quill adapters add weight and aren't exactly pretty, but if those are the only drawbacks I'm comfortable throwing down $15 on an $80 bike. I believe the current fork I have is aluminum. $20 gets me a new steel fork, $50 for aluminum, and $80 for carbon.
#7
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I got a BBB stem raiser, being an internal quill , it also functions as an adapter, once wedge is tightened,
spacers are slipped over, and the shim from 1>1.125" , then the threadless stem grips the shim,
it worked... , my situation threadless , too short.. the clever bit is the steel wedge bolt, custom forged..
the 6mm allen hex socket is itself internally threaded, for the top cap bolt , that adjusts the headset preload.
spacers are slipped over, and the shim from 1>1.125" , then the threadless stem grips the shim,
it worked... , my situation threadless , too short.. the clever bit is the steel wedge bolt, custom forged..
the 6mm allen hex socket is itself internally threaded, for the top cap bolt , that adjusts the headset preload.