Spokes thru rim- 3x same bike
09-11-18, 04:04 PM
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Spokes thru rim- 3x same bike
On my Kona, I just noticed all the spokes on the chain side (of the rear wheel) are coming thru the rim. Who knows how long Ive been riding on it this way. It happened to the original rear wheel- had to get new wheel. Now, same problem on that replacement wheel. ummm, the guy @ my lbs has this habit of tightening the spokes of all new wheels after ~100 miles. Says they get loose after riding on them a while, so you gotta tighten em. I think he tightens all the spokes the same amount, no matter what. Anyway, Im blaming him. Gonna ride it to the shop tmrw- what should I say/expect?
09-11-18, 04:20 PM
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How many miles on the old and the new wheels before spoke nipple pull through? What rims? What spokes, gage included? Is spoke nipple pull through (the rim is cracking around the spoke holes) the problem or is it that the spokes are longer then the nipple heads and poking past them? Too little data and description to really commit yet. I wonder what the shop mechanic has to say, or some other experienced wrench who can actually hands on the situation. Andy
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AndrewRStewart
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09-11-18, 05:19 PM
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OK, so it only happened twice on my Kona; but it happened once on my Masi; total 3x.
Id say several thousand miles on each rim.
Id say several thousand miles on each rim.
09-11-18, 06:10 PM
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Through that photo's lack of focus I think I see rim cracks at the spoke nipple holes. True? Andy
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AndrewRStewart
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09-12-18, 08:39 AM
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with an abundance of spokes sharing the tension load,
I've never pulled a nipple through the rim hole.
I built most of my wheels , the 30 year old ones, still fine..
I've never pulled a nipple through the rim hole.
I built most of my wheels , the 30 year old ones, still fine..
09-12-18, 08:45 AM
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Machine built wheels..... the tension is all over the place. I find you need to back them all down and start again... not just go around and tighten them.
09-12-18, 08:54 AM
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Although it has been known for the occasional batch of rim to come out too brittle, the usual cause of failures like that is overtension.
(at some point, the dividing line between overtension and simply lifed out becomes a matter of debate)
Merely upping the tension as standard practice is NOT a wise move. Specially if it’s done on feel only.
A dirtbike club I was loosely associated with decades ago had a spate of bad rear wheel failures and crashes. Turned out that there was a rumor going around among the junior riders that ”tight spokes gave better acceleration”, so they’d touch up their spokes almost weekly, and then ride the wheels to failure.
(at some point, the dividing line between overtension and simply lifed out becomes a matter of debate)
Merely upping the tension as standard practice is NOT a wise move. Specially if it’s done on feel only.
A dirtbike club I was loosely associated with decades ago had a spate of bad rear wheel failures and crashes. Turned out that there was a rumor going around among the junior riders that ”tight spokes gave better acceleration”, so they’d touch up their spokes almost weekly, and then ride the wheels to failure.
09-12-18, 02:04 PM
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Unfortunately you cannot now get an accurate read of the tension they tightened to, but I would still ask for a read of what the current tension is. Certainly it's bad practice to tighten spokes "just because". Proper tension is much more critical and is in a much smaller range nowadays due to decreased spoke count, increased dish, anodized rims and the emphasis on less weight.
Last edited by cny-bikeman; 09-12-18 at 03:21 PM.
09-12-18, 03:17 PM
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Unfortunately you cannot now get an accurate read of the tension they tightened to, but I would still ask for a read of what the current tension is. Certainly it's bad practice to tighten spokes "just because". Proper tension is much more critical and is in a much smaller range now due to decreased spoke count, increased dish, anodized rims and the emphasis on less weight.
