What should I be looking for, visible cracks?Geoff wrote:Check the hub flanges, too. I have broken a number of DT240 flanges and I am much lighter than you...
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why are my rear spokes pinging on 12%+ climbs?
Moderator: robbosmans
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Does this help?alcatraz wrote:Maybe it's my eyes but it looks like you are running 3x on a hub designed for 2x.
If this is the case, it would stress the spoke heads and flanges because they don't line up with the drill angles in the hub.
My bad, seems that the 28h hub is 3x and 24h is 2x.
How's your spoke tension? Maybe it's a bit low.
You could feel the (drive side) spoke tension difference with the tire inflated and deflated. Tell us if you notice something weird like a large variation.
120kgf should feel quite stiff, like if you squeeze hard they could start hurting your hand a bit. Deflection could be 2-3mm at most at the crosses.
(Edit: valve is in the right position)
How's your spoke tension? Maybe it's a bit low.
You could feel the (drive side) spoke tension difference with the tire inflated and deflated. Tell us if you notice something weird like a large variation.
120kgf should feel quite stiff, like if you squeeze hard they could start hurting your hand a bit. Deflection could be 2-3mm at most at the crosses.
(Edit: valve is in the right position)
I can make them move when squeezing a pair of drive-side spokes. they move 2 or 3mm at the cross, as you suggest. My LBS builds wheels, maybe I'll get him to measure the tension on them all.alcatraz wrote: ↑Thu Feb 07, 2019 5:38 amHow's your spoke tension? Maybe it's a bit low.
You could feel the (drive side) spoke tension difference with the tire inflated and deflated. Tell us if you notice something weird like a large variation.
120kgf should feel quite stiff, like if you squeeze hard they could start hurting your hand a bit. Deflection could be 2-3mm at most at the crosses.
(Edit: valve is in the right position)
Every time pinging has happened for me (on a cross spoke pattern), the cure has been a drop of oil on the crossing points and then wiggle them a bit to distribute. Sometimes happens after extensive cleaning.
Good point made by Andreas.
Lubing the heads and crosses is not a permanent solution but I would do it for failsearching purposes.
Maybe your spokes or hubs arent cut to proper tolerances so that you get a bad interface between them. Then when you apply heavy torque they start producing noises.
Even though it's not recommended maybe try some spoke head washers on your pulling spokes. You have 7 on each side but ds side is probably the highest tensioned ones where the noise is more likely to come from if the theory is correct. Problem with using washers is corrosion so brass or titanium would be more long term.
Lubing the heads and crosses is not a permanent solution but I would do it for failsearching purposes.
Maybe your spokes or hubs arent cut to proper tolerances so that you get a bad interface between them. Then when you apply heavy torque they start producing noises.
Even though it's not recommended maybe try some spoke head washers on your pulling spokes. You have 7 on each side but ds side is probably the highest tensioned ones where the noise is more likely to come from if the theory is correct. Problem with using washers is corrosion so brass or titanium would be more long term.
took the wheels into my local bike shop, and he said the same. Also checked spoke tension, they are low, but within range. Have them booked in to tighen them up late this week, and lube the cross points.
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