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Spoke Tension per MTB Wheels
Good day to all,
I have reviewed most of the material written on wheelbuilding, but most of it seems to be geared toward road riding, which is fine. But I have just started building wheels for MTB racers. So far I have had no complaints. But just wanted to hear some thoughts on how tight MTB wheels should be laced given the fact that MTB wheels take a huge amount of abuse. If you tension as per normal road specs which is close to maximum, are you building a wheel too close to failure for use off-road taking hits from logs, jumps, and whatever else nature can through at a wheel. Thank you |
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#2
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Spoke Tension per MTB Wheels
P. Lynn Miller wrote: Good day to all, I have reviewed most of the material written on wheelbuilding, but most of it seems to be geared toward road riding, which is fine. But I have just started building wheels for MTB racers. So far I have had no complaints. But just wanted to hear some thoughts on how tight MTB wheels should be laced given the fact that MTB wheels take a huge amount of abuse. If you tension as per normal road specs which is close to maximum, are you building a wheel too close to failure for use off-road taking hits from logs, jumps, and whatever else nature can through at a wheel. Thank you Wheels are wheels, regardless of use. Pick the proper rims, use a good hub(XT), use enough 14/15 spokes, lace 3 cross, and the tension for right side rear and front should be 100 kgf, measured on a tensionopmeter. |
#3
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Spoke Tension per MTB Wheels
P. Lynn Miller writes:
I have reviewed most of the material written on wheelbuilding, but most of it seems to be geared toward road riding, which is fine. But I have just started building wheels for MTB racers. So far I have had no complaints. But just wanted to hear some thoughts on how tight MTB wheels should be laced given the fact that MTB wheels take a huge amount of abuse. What is it that you think is different whether the load on the wheel comes from asphalt or dirt? If there were such a difference I would not so readily ride my thin tired bicycle on unpaved roads and forest trails. http://www.paloaltobicycles.com/alps_photos/f64.html If you tension as per normal road specs which is close to maximum, are you building a wheel too close to failure for use off-road taking hits from logs, jumps, and whatever else nature can through at a wheel. I think you should read ho a bicycle wheel supports loads before making that assessment. Spokes do not become tighter when riding over obstacles, the downward spokes in the road contact area slacken. You can find out about all this in "the Bicycle Wheel" that also has an extensive section on wheel building. http://sheldonbrown.com/harris/books.html#brandt Jobst Brandt |
#4
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Spoke Tension per MTB Wheels
P. Lynn Miller wrote:
Good day to all, I have reviewed most of the material written on wheelbuilding, but most of it seems to be geared toward road riding, which is fine. But I have just started building wheels for MTB racers. So far I have had no complaints. But just wanted to hear some thoughts on how tight MTB wheels should be laced given the fact that MTB wheels take a huge amount of abuse. excess tension increases the propensity of the rim to taco - contrary to popular belief, it does not make the wheel "stronger". similarly insufficient tension can allow spoke nipples to work loose unless threadlocked. If you tension as per normal road specs which is close to maximum, are you building a wheel too close to failure for use off-road taking hits from logs, jumps, and whatever else nature can through at a wheel. Thank you simply build according to the rim manufacturer's spoke tension spec. as peter says, a wheel is just a wheel. |
#5
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Spoke Tension per MTB Wheels
Thanks, Mr. J. Brandt et al
What is it that you think is different whether the load on the wheel comes from asphalt or dirt? If there were such a difference I would not so readily ride my thin tired bicycle on unpaved roads and forest trails. I believe that there is practically no difference in loading or stress on a wheel that is ridden on asphalt or dirt as you say. But I was not referring to a wheel being ridden on gravel roads or even fire trails. I am talking about a wheels that is ridden over 160kms of technical single track during an 8-hr race, facing a constant on-slaught of tree roots, rocks, logs, ruts and rough landings from taking air from tired racers. That is how the wheels I am building are being used. The level of stress and loading is raised to a whole new level over a wheel that is used on marginally smooth surfaces with some sort of care. I think you should read ho a bicycle wheel supports loads before making that assessment. Spokes do not become tighter when riding over obstacles, the downward spokes in the road contact area slacken. You can find out about all this in "the Bicycle Wheel" that also has an extensive section on wheel building. I understand how a wheel supports loads and have read most everything that has been written on wheels including your own writings, and as far I can tell there is as much agreement on the subject as there is on the virgin birth. Just was inquiring of the experience of anyone out there that specializes in building wheels for free-riders, trials and endurance MTB racers. Thanks, P. Lynn Miller |
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