Cutting Steerer Tube
03-10-06, 05:40 AM
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Cutting Steerer Tube
I just fitted a new set of forks and i need to cut the steerer tube.
Can anyone tell me how much clearance i need to leave between
the tube and the top of the stem on a threadless headset? I don't
know if i've made myself clear but i'm not sure of the correct terminology.
Can anyone tell me how much clearance i need to leave between
the tube and the top of the stem on a threadless headset? I don't
know if i've made myself clear but i'm not sure of the correct terminology.
03-10-06, 06:09 AM
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1/8" should do it.
03-10-06, 06:09 AM
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Install fork, stem, and handlebars. Do not cut steerer. Use spacers above and below stem. Test ride bike to dial-in fit, raising and lowering stem by moving spacers around until you have the right fit.
Then mark steerer at point where top of stem meets steerer.
Then remove fork.
Cut steerer 1/8 inch below mark ("below" means toward the fork crown).
Reinstall fork, star fangled nut or steerer plug, spacers, and stem. Adjust accordingly.
The site below has detailed instructions with photos.
https://www.parktool.com/repair/readhowto.asp?id=111
Bob
Then mark steerer at point where top of stem meets steerer.
Then remove fork.
Cut steerer 1/8 inch below mark ("below" means toward the fork crown).
Reinstall fork, star fangled nut or steerer plug, spacers, and stem. Adjust accordingly.
The site below has detailed instructions with photos.
https://www.parktool.com/repair/readhowto.asp?id=111
Bob
03-10-06, 07:47 AM
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...Or if yer happy with the length of yer old fork and youre reusing the old headset, simply measure it from the top of the crown race and match that length on the new fork. Whatever's clever...
03-10-06, 09:36 AM
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I like to leave the steerer a bit long so i can put a 5 or 10 mm spacer ABOVE the stem. It alows for later adjustment and, particularly with a carbon steerer, makes sure the stem clamps entirely on the steerer tube.
