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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spokes Aint Spokes - or are they?
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<blockquote data-quote="Monkeypants" data-source="post: 43607" data-attributes="member: 2708"><p>After reading Davd Dunfey's posts on using a spoke torque wrench for wheel building , I purchased one. David suggested that many wheels done without a torque wrench are not sufficiently tight and have big differences in spoke tension throughout the wheel. On checking some existing wheels for spoke tension, I found the same thing .</p><p>Tension varied from 15 lbs t.o 60 inch pounds on the same wheel, a professionally built wheel at that and running true to within .015.</p><p>Most of the wheels checked had an average spoke tension of around 30 inch pounds. </p><p>Excel wheel company recommends spoke tension be set at 60 inch pounds, while Buchanans go even higher at 80 inch pounds. Butchanans now use a spoke torque wrench on all their builds</p><p>I used the torque wrench last week to lace a Devon alloy rim to the Vincent rear hub. Devon provides inner and outer spokes for the back hub, but only one bend of spoke for the front hub. This is because of the greater width of the rear hub.</p><p>The process was pretty simple using the torque wrench. I used an ordinary spoke wrench to bring the spokes up to very light, but quite uneven tension and get the rim roughly concentric and centred over the hub. Starting at 15 inch pounds and adding ten inch pounds per rotation , I finshed with the torque wench at 60 inch pounds. Without even trying to true the wheel this automatically brought it almost on spec, just 20 thou total runout one way and 15 the other. A bit of weaking with a regular spoke wrench brought the rim to within 5 thou of concentric both ways. Spoke tension is within 5 inch pounds of even all the way around the rim.</p><p>I wonder how many broken spokes are due to under or over tension and uneven tension resulting in just a few spokes carrying most of the load?</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 43607, member: 2708"] After reading Davd Dunfey's posts on using a spoke torque wrench for wheel building , I purchased one. David suggested that many wheels done without a torque wrench are not sufficiently tight and have big differences in spoke tension throughout the wheel. On checking some existing wheels for spoke tension, I found the same thing . Tension varied from 15 lbs t.o 60 inch pounds on the same wheel, a professionally built wheel at that and running true to within .015. Most of the wheels checked had an average spoke tension of around 30 inch pounds. Excel wheel company recommends spoke tension be set at 60 inch pounds, while Buchanans go even higher at 80 inch pounds. Butchanans now use a spoke torque wrench on all their builds I used the torque wrench last week to lace a Devon alloy rim to the Vincent rear hub. Devon provides inner and outer spokes for the back hub, but only one bend of spoke for the front hub. This is because of the greater width of the rear hub. The process was pretty simple using the torque wrench. I used an ordinary spoke wrench to bring the spokes up to very light, but quite uneven tension and get the rim roughly concentric and centred over the hub. Starting at 15 inch pounds and adding ten inch pounds per rotation , I finshed with the torque wench at 60 inch pounds. Without even trying to true the wheel this automatically brought it almost on spec, just 20 thou total runout one way and 15 the other. A bit of weaking with a regular spoke wrench brought the rim to within 5 thou of concentric both ways. Spoke tension is within 5 inch pounds of even all the way around the rim. I wonder how many broken spokes are due to under or over tension and uneven tension resulting in just a few spokes carrying most of the load? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spokes Aint Spokes - or are they?
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