Bafang spokes breaking

[trex]

I'd have a word with the guy who did your spokes and go watching him fixing your wheel.
It takes seconds to check the spoke tension. Did he check the tension of each spoke? if so, what was the spoke tension?
If your rim was slightly wonky, the rebuilt wheel will settle down after a few miles, the wheel needs truing again. The second truing will last a lot longer than the first, the third truing will last longer than the second. Nothing beats mastering the dark art.

 

[Deleted member 4366]

Nearly all my rims are Chinese. I've not had anything like that. I'm 100kg and use a motor with a lot more torque than yours. What they said doesn't ring true to me.

 

[MaxMachin]

I've spoken to him. He couldn't give me a spoke tension so I gave him the sudgested 100Kpf.
I'm collecting it this afternoon and I'll let you know the outcome.

 

[trex]

you mean 100kgf (220 pounds). I am sure he'll sort that wheel out.

 

[KTM Bike Industries UK]

What rim have you got? If swapping the spokes hasn't sorted it, I'm afraid you'll need to buy a decent rim.... the country of origin isn't the important factor - the quality is.

This will sort your problems, even a very good wheelbuilder can't keep a rim straight if its made of soft cheese. A good rim will disguise a bad wheel build, but a good wheel build can't hide a poor quality rim.

 

[NZgeek]

Hmmm...I've just been having some issues too...

After the first chinese spoke broke, I used Sapim double-butted 13/14's, and a Mavic downhill double wall, eyeleted rim. It was the second wheel I've ever built, so I may have screwed it up entirely!

After about 200 miles, a spoke broke on the way home.

Today, I had the bike parked next to my desk - I heard a twang, and a spoke head landed on the floor!

Both spokes broke at the bend, they're 165mm, running single cross.

I had one side running tighter than the other, to offset the rim, and they both seem to have broken on the side with the straighter spokes.

I'm thinking I'll respoke it, turning the spokes on one side, so the heads face inwards, offsetting the rims, but allowing me to run the same angle and tension on both sides.

Does that sound sensible?

I was considering redrilling the hub, in case the holes are badly formed/countersunk and causing the issue?

Or perhaps I need washers on the head side to pull them into the holes.

It there a cheaper alternative to the Park Spoke Tension tool?

Cheers.

 

[trex]

there is no alternative to Park Tool spoke tensiometer.
Once the problem has gone, you can always put the spoke meter on ebay.

 

[NZgeek]

there is no alternative to Park Tool spoke tensiometer.
Once the problem has gone, you can always put the spoke meter on ebay.

Hmmm... I like tools though - I can nver bear to sell them, or even hire them. I got some silly ones, that I'll only ever use once probably (BMW Suspension Bush removers, Aircooled VW hinge pin removers, Medical Lasers etc)

Haha... I just ordered the Park tool (and arm coolers, to get free freight) all up totalled 51.5 pounds shipped to NZ!

 

[trex]

I am a little like you on that respect. Have used my tension meter 2 minutes so far.