Bicycle Mechanics - How high can I have my stem with this head tube?

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nutbag
08-12-04, 09:43 PM
The head tube is 160mm, and the steerer is a one inch carbon (threadless, obviously), that is (i think) 300mm.

If I use an A-head set-up, how high can I have the top of the stem, measuring from the bottom of the steerer? 290mm? I probably couldn't go lower that 29cm from the fork crown without getting one of those "pointy right uppy" stems, which I'm trying to avoid. I do give the bars a bit of a workout, so there's gunna be a bit torque.

Thanks :)

sydney
08-13-04, 07:09 AM
The head tube is 160mm, and the steerer is a one inch carbon (threadless, obviously), that is (i think) 300mm.

If I use an A-head set-up, how high can I have the top of the stem, measuring from the bottom of the steerer? 290mm? I probably couldn't go lower that 29cm from the fork crown without getting one of those "pointy right uppy" stems, which I'm trying to avoid. I do give the bars a bit of a workout, so there's gunna be a bit torque.

Thanks :)You can only use about 25mm of spacers with that 1" CF steerer. with a 160HT, 30 mm bearing stack, 40mm stem stack and even 30mm or spacers,you will only be at about 260 to the top of the stem.I thnk you are barking up the wrong tree with this idea of stem/bar height, a 1" CF steerer and lots of torque.
nutbag
08-13-04, 11:40 AM
So, it sounds like I'd be better off with an old quill stem and a threaded
head-set........maybe? I have another bike with a ~166mm head tube, and I have the top of the 3ttt stem at about 290mm from the bottom of the steerer.

sydney
08-13-04, 02:33 PM
So, it sounds like I'd be better off with an old quill stem and a threaded
head-set........maybe? I have another bike with a ~166mm head tube, and I have the top of the 3ttt stem at about 290mm from the bottom of the steerer.You can get away with what you are trying to do with a threadless steel or aluminum steerer, but it will look goofy.That kind of stack is just not recommended with a CF steerer especailly with lots of torque.