_ said:Ben C said:_ said:On Fri, 19 Oct 2007 20:13:22 -0600, [email hidden] wrote:
[...]Quoted message said:>>> It does seem odd that rim cracked around the spokes with less initial
>>> tension.
>>>
>>> If they lost all tension (rattling loose), would impact be a possible
>>> explanation?
>>>
>>> That is, the higher-tension drive-side spokes just see tension falling
>>> and rising smoothly, but the lower-tension non-drive-side spokes might
>>> be loose enough that they go bang-bang-bang against the rim as they
>>> lose all tension momentairly and then reseat.
>>>
>>> The distance involved must be tiny, but it's still an impact rather
>>> than just tension rising and falling while the spoke nipples stay in
>>> contact with the rim.
>>>
>>
>>I rather suspect were that the case, the wheel would go out of true long,
>>LONG before the non-drive side cracks appeared. As the orignal poster
>>seems completely capable of determining which spokes are on the drive and
>>non-drive side, he would be extremely unlikely to have failed to notice the
>>lack of truth.
>
> Dear _,
>
> Why would the rim go out of true before the rim cracks appeared if the
> non-drive-side spokes go completely slack?
>
> (I don't know if they were in fact going slack, I'm just wondering
> what might cause the more lightly tensioned spokes to crack the rim.)
>
> Nipples unscrewing?
>Got it in one, you clever boy.
They don't necessarily unscrew though. OP used oil, not linseed or
threadlock, but even so, things can get gummed up or stick a bit.Any "hammering" sufficient to cause rim cracking would loosen gummed up
threads long before rim cracking.
Dear _,
Really? My experience is different.
I once stopped after about 80 miles on a flat rear motorcycle tire in
Baja and used LocTite on lots of loosened spokes.
The spokes held fine for the next 100 miles, when the tire bead came
out and halted the proceedings.
I suspect that the hammering on the rocky road was far more than any
bicycle rim would survive.
Cheers,
Carl Fogel