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Spoking wheels
On Wed, 22 Nov 2017 19:27:20 +0100, Tosspot
wrote: On 22/11/17 06:53, John B. wrote: I'm rebuilding a rear (derailier) wheel as, to be frank, I used spokes that were slightly smaller in diameter on the cassette side of the wheel then probably wise, and had occasional spoke breakage. I finally got some slightly larger diameter spokes and am lacing the cassette side of the wheel. Over probably a couple of years I had four spokes break, one at a time, all were what Sheldon referred to as trailing spokes, the ones that have the highest strain when pedaling, and all broke at the middle of the bend at the head end. While I was lacing the wheel with the new spokes I got to wondering whether the side of the hub flange that spoke heads were on might have had any effect on strength. I have always laced 36 hole wheels over three for rear wheels and over two for front wheels with the trailing spoke heads on the outside of the hub flange and the leading spokes with the heads on the inside of the flange, as I believe that Sheldon recommended. But I also remember someone here with a rant about rear wheel lacing who I think was recommending that on the cassette side that the heads should all be toward the outside of the flange. I assumes to prevent damaging spokes if the chain were to come off the largest cassette cog and jam between the spokes and the cassette. This is the only wheel I've had problems with and I deliberately bought the bits and pieces with the idea of long life in mind - cartridge wheel bearings and medium weight rim with eyelets, etc., and as this is the only wheel that I've had problems with I'm fairly sure that my wheel building technique is reasonably effective. Any thoughts on spoke head orientation and the effect on spoke strength. No, but the one time I had that I had over tensioned the wheel. Exact symptoms you described. Backed off all the spokes, never had a breakage in the subsequent 4(?) years. Could be. I rarely use a spoke tension gauge and just tighten things until they feel right so I might have over tensioned that wheel. -- Cheers, John B. |
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