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#1
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spoke gauge/spoke tension relation....
assuming the same hub and rim combination....how much higher would the
spoke tension be if you changed from a 3X with 1.8/2.0mm spokes to 1.5/2.0mm spokes? on an unrealted note, i recently built another wheels set for a road bike. the spokes when laced and tensioned, ended up to be about 2mm too short. if you can imagine the slot in the nipple, for the nipple driver, the spoke end is about 2mm below this point. i know that only a portion of the nipple is actually threaded. will this be a problem at some point? thanks in advance. |
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#2
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wrote:
assuming the same hub and rim combination....how much higher would the spoke tension be if you changed from a 3X with 1.8/2.0mm spokes to 1.5/2.0mm spokes? The tension should be the same assuming everything is the same except the spoke gauge. on an unrealted note, i recently built another wheels set for a road bike. the spokes when laced and tensioned, ended up to be about 2mm too short. if you can imagine the slot in the nipple, for the nipple driver, the spoke end is about 2mm below this point. i know that only a portion of the nipple is actually threaded. will this be a problem at some point? Ideally, the spoke should come to the top of the slot so that you could not place a screwdriver in the slot. Second best is if the spoke reaches the bottom of the slot. What you've got is not ideal, but shouldn't be a problem. I assume you can't see any exposed threads below the nipple. Art Harris |
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#4
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nope...no exposed threads below the nipple. thanks to you both. i
just want to be sure. as for the spoke tension changes....got it. tensions is tension. |
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#6
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The tension of the spoke needs to be the same, regardless of the gauge. A wheel is a pretensioned structure who's strength depends on the initial stress state. Because a butted spoke must be elastically deformed to a greater extent to achieve the same tension, the wheel constructed with butted spokes will have greater durability because rim deformations will result in less spoke tension loss. Racing engines utilize the same technique when bolt towers are used on the head bolts since increasing the length of a fastener is analogous to decreasing the diameter with respect to elasticity. You need at least 6 turns of engagement on the nipple IF it is brass. Aluminum nipples NEED to be at the bottom of the slot MINIMUM, otherwise the nipples will fail. -- Weisse Luft |
#7
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You need at least 6 turns of engagement on the nipple IF it is brass. Aluminum nipples NEED to be at the bottom of the trash can. 6! dancedancedance. i'll go with it. on first threads carrying loads-this would seem to be a faith based concept not a manufacturing reality. ahaso! on tension, on donner, on galileo-the spokes will twang at a different pitch, will different twangs produce a different tensions using the tensionometers? |
#8
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#9
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Michael Dart writes:
assuming the same hub and rim combination....how much higher would the spoke tension be if you changed from a 3X with 1.8/2.0mm spokes to 1.5/2.0mm spokes? As was said, tension is tension. Most tensiometers use a measurement of spoke deflection (bending) when held at two points and pressure is put on a third between them to represent tension. Since different gauges of spokes deflect differently under the same tension, the tensiometer readings are 'calibrated' to compensate for this. The numerical reading off the tensiometer would be less for the 1.5 mm spoke than the 1.8 mm spoke given the same tension. That's the case with currently available tensiometers but the one I use does not measure across the spoke but rather on one side so thickness doesn't enter into it and deflections over a four inch span are nearly identical for 1.6 to 2.0mm diameter spokes. Although the instrument is shown in "the Bicycle Wheel", manufacturers of these instruments do not recognize the advantage of unilateral measurement and require the user to use a lookup table for spoke thicknesses. Jobst Brandt |
#10
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datakoll- the spokes will twang at a
different pitch, will different twangs produce a different tensions using the tensionometers? BRBR Yes why tone doesn't tell you tension, just if the spokes are close in tension to each other...I think ...that's what you asked.. Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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