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Any problems with alloy wheel nuts?

sawood12

sawood12

New member
I recently read the Track Day Guide in PP which advised that you should not use the std alloy wheel nuts for track days and instead refit with steel ones. Is there a problem with the alloy wheel nuts or does it just affect track day junkees where the heat built up in the hub area is more than normal and cornering forces are higher?

I've often wondered about the fatugue affects of the alloy nut thread. I wonder how many tighten/loosen cycles the nuts can safely whithstand assuming a torque of 100ft/lb? Especially since I got a 2nd hand set of nuts shortly after buying my car as alot of the nuts were badly corroded so god knows how many cycles they've clocked up so far.
 
Judging from the state of the slim spoke "Siver Rose" Design 90 look-alikes that we've seen on here after track days, I would think the wheel or tyre would be more likely to fail over the 5 heafty bits of steel holding the thing on!
 
The nut torque is 90 or 95 I think, so not quite 100. In any case it's a fair question and I know for last year's competitive sprint at Brands the competing cars were supposed to be fitted with steel nuts. I have thought of doing that with mine but that's as far as it has got. 2 per wheel on mine are brand new at least.
 
Mine were awfull when I bought the car so I replaced them, have never noticed the comments in the trackday write up and have always used them wthout issues. I am also fairly sure that cars and car conversions (CCC) used to carry an advert for OZ alloy wheel nuts for rallying which I would have thought put them under even greater load.
Tony
 
I've read that a few times and did know that motorsport regulations stipulate steel nuts for safety reasons. Mine have been tightened and loosened many times to 130Nm as per spec but it does eem wise to replace them. I wouldn't want to be the first to find out what the actual lifetime is [:eek:]

Bert Gear sells the steel ones for about a quid each IIRC. They dont look pretty but it would make sense to keep them with the track wheels
 
Maybe it wasn't Porsche Post I read it in then but i've definately read it somewhere, but from the sounds of it, it doesn't seem to have caused a problem to anyone.
 

It was in the regulations for the Porsche Festival Sprint and, I seem to recall, noted in "The Blue Book" which also prohibits wheel centres IIRC.

I swapped mine last year for a full set after tales of people being unable to remove theirs and rounding them off [:eek:]. I paid £30 for a set of 20 purchased at the festival.

I have had issues with wheels coming loose as I'm not overly keen on over tightening alloy nuts but, particularly with the expansion and contraction through heat on a track, one does need to check them regularly.


Edit - Having read the above again I realize that it is ambigious in that it might be read that I purchased steel nuts. I actually bought a new set of alloy nuts. Have you seen how much heavier steel nuts are,and they are unsprung weight as well. [:eek:]
 
ORIGINAL: sawood12

Maybe it wasn't Porsche Post I read it in then but i've definately read it somewhere, but from the sounds of it, it doesn't seem to have caused a problem to anyone.
Click to expand...

Probably was, but I probably haven't read it properly
Tony
 
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