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Road Bars (26mm) in a Mountain (25.4mm) Stem = Problem?
On Sat, 02 Apr 2005 20:38:12 -0500, Steve Sr.
wrote: Is this small diameter difference likely to cause a problem in real life? You bet. I am trying to put a high angle (130 degree) stem on my road bike to improve the fit and the high angle stems seem to only available for Mountain bars. Add a layer of cola can as a shim. That generally takes care of the misfit. Make your first ride leaning hard on the hoods along a bumpy run *expecting* the bars to pitch forward and down at any time, and if the bars don't rotate under those conditions, you should be safe. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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In article , Steve Sr. says...
Is this small diameter difference likely to cause a problem in real life? I am trying to put a high angle (130 degree) stem on my road bike to improve the fit and the high angle stems seem to only available for Mountain bars. Thanks, Steve I did this for the same reason. If the stem does not have a removable face plate the bends in the road bar will not fit through the hole in the stem. Get a one inch ******* (half round) file and enlarge the hole. The radius of the file and the radius of the hole match closely so it is easy to enlarge the hole evenly. Check you work by trying to put the bar into position in the stem. If the stem head is aluminum you should be done in 15 minutes. Steel may take much longer. I was amazed that the 0.6mm difference in diameter is enough to prevent the bends in the road bar from passing through the hole in the stem. |
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On Mon, 04 Apr 2005 21:49:48 -0400, Steve Sr.
wrote: Sorry, I don't believe they make negative shims as others have already pointed out. The bars are already bigger than the stem. Oops, yes, that's correct. Your best bet, then, will be to find a set of 25.4mm drop bars to fit the mtb stem. Although it would be possible to resize the bar clamp to fit the larger diameter, this is a tricky process when the clamp must be honed or machined with a fixed gap retained to ensure that the clamping is successful afterwards. It's been a good many years since I had access to the type of hone that would do this easily, and I'd be hesitant to trust the task to someone unfamiliar with the requirements. Accordingly, the more rational approach is to match the sizes of the components. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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Werehatrack wrote:
On Mon, 04 Apr 2005 21:49:48 -0400, Steve Sr. wrote: Sorry, I don't believe they make negative shims as others have already pointed out. The bars are already bigger than the stem. Oops, yes, that's correct. Your best bet, then, will be to find a set of 25.4mm drop bars to fit the mtb stem. Although it would be possible to resize the bar clamp to fit the larger diameter, this is a tricky process when the clamp must be honed or machined with a fixed gap retained to ensure that the clamping is successful afterwards. It's been a good many years since I had access to the type of hone that would do this easily, and I'd be hesitant to trust the task to someone unfamiliar with the requirements. Accordingly, the more rational approach is to match the sizes of the components. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. In the "old days" my friend, Bicycle Bob, put a 26.4 Cinelli bar through a 25.4 SR road stem by prying the clamp apart a little. He rode it many hard miles without a problem. Your mileage may vary. Dano Lopez Island WA |
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"Ed" wrote in message ... In article , Steve Sr. says... Is this small diameter difference likely to cause a problem in real life? I am trying to put a high angle (130 degree) stem on my road bike to improve the fit and the high angle stems seem to only available for Mountain bars. Thanks, Steve I did this for the same reason. If the stem does not have a removable face plate the bends in the road bar will not fit through the hole in the stem. Get a one inch ******* (half round) file and enlarge the hole. The radius of the file and the radius of the hole match closely so it is easy to enlarge the hole evenly. Check you work by trying to put the bar into position in the stem. If the stem head is aluminum you should be done in 15 minutes. Steel may take much longer. I was amazed that the 0.6mm difference in diameter is enough to prevent the bends in the road bar from passing through the hole in the stem. 0.6 mm is huge in this kind of work. Try to fit a bearing in a hole that is 0.6 mm to small. Boy, that would be a press fitting, Lou |
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In article , Lou Holtman says...
"Ed" wrote in message ... In article , Steve Sr. says... Is this small diameter difference likely to cause a problem in real life? I am trying to put a high angle (130 degree) stem on my road bike to improve the fit and the high angle stems seem to only available for Mountain bars. Thanks, Steve I did this for the same reason. If the stem does not have a removable face plate the bends in the road bar will not fit through the hole in the stem. Get a one inch ******* (half round) file and enlarge the hole. The radius of the file and the radius of the hole match closely so it is easy to enlarge the hole evenly. Check you work by trying to put the bar into position in the stem. If the stem head is aluminum you should be done in 15 minutes. Steel may take much longer. I was amazed that the 0.6mm difference in diameter is enough to prevent the bends in the road bar from passing through the hole in the stem. 0.6 mm is huge in this kind of work. Try to fit a bearing in a hole that is 0.6 mm to small. Boy, that would be a press fitting, Lou True. But the part of the handlebar where the bends are is less than 25.4mm. The bends will not fit through 25.4 hole but will fit through a 26mm hole. |
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