RoadBikeReview.com's Forum Archives - Components
questions about steerer tube diam & stems, threadless vs. ?(5 posts)
|questions about steerer tube diam & stems, threadless vs. ?||Haiku d'état|
Jun 7, 2001 3:28 PM
|converting an old SS cruiser to some kind of crazy mutant bike. learning experience. questions:
stem: replacing comfort-angled quill/threaded stem with another, and the cruiser bar with a straight bar. getting whatever's on sale at nashbar (this is a beater).
how do i determine the steerer tube diameter? can the fork be removed and the top of the steerer tube rolled along a ruler to get an accurate diameter measurement (of 1/4 or 1/8)?
also, anyone have experience with threadless stem adapters?
|check quill diameter...||C-40|
Jun 7, 2001 7:12 PM
|Quill portion of a stem for a 1 inch steering tube is 22.2mm or 7/8" inch diameter. Quills are 25.4mm or 1 inch diameter for 1-1/8" steering tubes.
To get an approximate diameter measurement, use an adjustable (crescent) wrench, and set it to fit tightly to the quill. Use a ruler or tape measure to measure the distance between the jaws. Works like a crude caliper.
|Crude caliper....||Rusty Coggs|
Jun 7, 2001 7:24 PM
|...I like it. One to remember.|
|re: questions about steerer tube diam & stems, threadless vs. ?||Rusty Coggs|
Jun 7, 2001 7:22 PM
|Pull it quill stem out.1" ones are usually marked 22.2mm ones for 11/8" are marked 25.something mm. Thoes numbers refrence inside diameter of steerer tube. Pull the steerer and measure diameter. A ruler across the top is good enough. Or just remove the top nut and pull the quill and then measure. If you have a caliper You can just measure the quill at the insertion mark. 22.2 or 25.something. Once you have seen several, you can tell the diff just by looking. I have used a few quill adapters. They are OK . Some are better than others.|
|thanks! i'll check this weekend.||Haiku d'état|
Jun 8, 2001 7:28 AM
|funny how you lose this stuff from school if you don't use it often enough. i was thinking diameter was the full distance around the tube, but that's circumference...diameter is the distance across the opening, radius is 1/2 the diameter. ouch. head hurt.
thanks again for your input!