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Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 5:03 am
by emotive
Geoff wrote:Check the hub flanges, too. I have broken a number of DT240 flanges and I am much lighter than you...
What should I be looking for, visible cracks?


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Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 5:03 am
by Weenie

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 5:13 am
by alcatraz
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.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 5:22 am
by emotive
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.
Does this help?
Image

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 5:38 am
by alcatraz
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)

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 6:28 am
by emotive
alcatraz wrote:
Thu Feb 07, 2019 5:38 am
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.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 10:21 am
by alcatraz
Sounds normal then. Maybe check the spokes for scratches? Is something touching them?

I have to say I'm very surprised. At 28 spokes too, and 85kg ride weight.

You must have legs the size of tree logs. :)

To be continued...

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 6:37 pm
by bm0p700f
Is the RD catching the spokes?

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Thu Feb 07, 2019 11:43 pm
by Cascadian
I had the same problem with my Mavic R-SYS SLR. It sounded like I was playing a piano very badly. The cure for me was a drop of teflon oil at the interface between the hub and spokes.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Fri Feb 08, 2019 2:12 am
by Geoff
@emotive, I can see from your pics that those are straight-pull 240s, which are apparently ok, so it is not that.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Fri Feb 08, 2019 3:27 am
by shimmeD
Hi Geoff, an earlier picture (on Pg 1 of this thread) shows DS spokes touching where they cross.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Fri Feb 08, 2019 6:14 am
by andreas
Cascadian wrote:
Thu Feb 07, 2019 11:43 pm
I had the same problem with my Mavic R-SYS SLR. It sounded like I was playing a piano very badly. The cure for me was a drop of teflon oil at the interface between the hub and spokes.
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.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Sat Feb 09, 2019 2:50 am
by alcatraz
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.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Tue Feb 12, 2019 3:59 am
by emotive
andreas wrote:
Fri Feb 08, 2019 6:14 am
Cascadian wrote:
Thu Feb 07, 2019 11:43 pm
I had the same problem with my Mavic R-SYS SLR. It sounded like I was playing a piano very badly. The cure for me was a drop of teflon oil at the interface between the hub and spokes.
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.
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.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Tue Feb 12, 2019 4:04 am
by alcatraz
Don't forget the heads.

If the pinging comes back it wasn't because of tension.

Tension is set without a tire. It's normal for tension to drop a bit after mounting a tire.

Re: why are my rear spokes pinging on 12%+ climbs?

Posted: Tue Feb 12, 2019 4:04 am
by Weenie