#16
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Last edited by tctyres; 03-12-2019 at 06:04 AM. |
#17
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For right above..OMG..battle of the equations... YOIKES!!
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#18
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Torque is applied when driving the hub (rear wheel) and as a result accelerating the rim or braking at the hub and as a result a negative acceleration of the rim.
I'd like to see a picture of a 3X laced 28 hole wheel that has spoke overlap. |
#19
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Sorry! I was trying not to ... but it happens.
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#20
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I lace my 28s 3x all the time and have never had a problem. Perhaps if you have small flanges and the wheel is laced at less than optimal tension you might have overlap issues, especially on the NDS where the tension is the lowest.
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It's all fun and games until someone puts an eye out... |
#21
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__________________
It's all fun and games until someone puts an eye out... |
#22
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[QUOTE=ergott;2512596]
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__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#23
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not 28 spokes
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#24
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If 28 3X was an issue I would have run across it long ago.
Last edited by ergott; 03-17-2019 at 10:05 AM. |
#25
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The hub only transmits torque loads if the spokes provide torsional stiffness. Since radial non-drive side spokes provide no torsional stiffness, they can't carry torsional loads, so torque is not transmitted across the hub. (Conversely, if the drive side spokes are radially laced, as on some Mavic Ksyrium wheels, the drive side spokes carry no torsional loads, and all torque is transmitted across the hub to the crossed non-drive spokes.) This is covered by several publications on wheel dynamics, including The Bicycle Wheel by Jobst Brandt. Quote:
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https://www.slowtwitch.com/Tech/Debu...ness_3449.html From the article: Quote:
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#26
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The average acceleration of the wheel is the average acceleration of the bike. If you're thinking only about the wheel, that's the problem. The wheel rotates over the ground (no-slip condition) and translates the hub. Quote:
Last edited by tctyres; 03-17-2019 at 09:46 AM. |
#27
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These forces can be quite substantial, certainly enough to bend the rim outright but for the effective later bracing provided by the spokes. Also, the bracing angle on the drive side has to provide a balancing equal force to the better-braced non-drive spokes, which may help one to visualize how substantive that the forces are. |
#28
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Is this thread now a battle between wheel and equations porn?
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#29
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Oh yeah? Take this.
What's scary is one or both of these guys will look at this and know what it means..
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#30
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Sheldon Brown's guide to wheel building says that radial lacing the non-drive side spokes can sometimes be an advantage because then these spokes experience no torque loads: https://www.sheldonbrown.com/wheelbu...ml#half-radial Here is an paper on the Williams Cycling web site, featuring an analysis of spoke loading with different lacing patterns. They also conclude that radial non-drive spokes transmit no torque: http://www.williamscycling.com/asset...e%20Lacing.pdf The Wheel Fanatyk blog also says this about radial non-drive spokes: Quote:
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This very obviously can not be true. The tire & rim are only connected to the rest of the bike by the spokes. Therefore all forces (lateral, vertical, and torsional) between the hub and rim must be transmitted by the spokes, and only by the spokes. |
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