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max spoke tension(4 posts)

max spoke tensionDougSloan
Nov 30, 2003 10:44 AM
Is recommended or maximum spoke tension of rims based upon the strength of the spoke hole/grommet or the total rim tension?

The reason I ask is that it seems to me that since spoke breakage is often caused by unsufficient tension, changes in tension, and fatigue, having fewer spokes, with each under higher tension than each would be with more spokes could actually decrease the risk of spoke breakage. Just a theory.

Here's what I'm thinking. If a 36 spoke wheel allows 100 pounds (unsure of units) of tension per spoke, that's 3600 pounds total. If the spec is based upon total tension, then a 28 spoke wheel would allow 129 pounds per spoke.

However, if the spec is based upon tension per spoke, then more spokes, each sharing less load, would be better, right?

Anyone know anything about this? Thanks.

Doug
re: max spoke tensioncurlybike
Nov 30, 2003 12:59 PM
Maximum spoke tension is determined by the weakest of the assembled parts. I have found that exceeding a particular tension while using Open Pro rims will lead to reduced rim life. Not much less than that will lead to premature spoke failure. When using Velocity deep V rims, I can exceed that tension value, but some hubs will blow apart after time from the tension. I have also found that with more spokes, you have to be carefull with tension or you may get rim sidewall failure that does not appear in the same rim at the same spoke tension with less spokes. The more I know, the more I know that I don't know enough.
re: max spoke tensionAl1943
Nov 30, 2003 4:56 PM
I agree with your line of reasoning. I think a 36 spoke wheel will have a longer life with less trouble. The wheels on my 23 year old commuter bike have been rebuilt with 36 Revolutions laced 3X on Shimano 600 hubs and they are bomb proof. All of my other wheels have fewer spokes and require some occasional attention to keep true. Same builder, me.
~Al
Then these must be really good wheels - they're gold to boot! ;-)B2
Nov 30, 2003 9:47 PM