I know there was a discussion about this a few years ago but I can't find any conclusions.
I bought a set of stainless nuts from James Paddock 4 years or so ago because my original nuts were alloy. I have only just come to fit them properly as I have been rebuilding the car. I find that they are smaller than the originals and leave the wheels looser. My findings are:-
My measurements of the original aluminium nuts which I still have are:-
Observation 2:- It seems that with some of my original wheels/nuts it is the outer diameter of the flange in the recess of the wheel which centralises the wheel so the reduction of this diameter by over 2 mm will stop this happening. Also the flange is what holds the wheel on so should not be reduced in diameter and therefore area as that will be more likely to permit a wheel to come loose.
Observation 3:- In addition to the dimensional differences in 1 and 2 above, the original nuts have a taper at the junction of the flange and the shank going from the 18.7mm of the shank to 20.5mm approx.. This is presumably there to provide some form of centring. The nuts you supplied have no such taper.
Apart from the dimensional errors and design changes above not necessarily centring the wheel correctly and causing imbalance I do not consider them fit for purpose from a safety point of view as they are more likely to permit movement of the wheel and loosening of the nuts.
I reported this to the supplier and thy say that they supplied almost 1000 last year and had no complaints. They say that as far as they know there is only one source for these nuts so can't supply alternatives but will give me a refund.
Is anyone aware of a solution to this?
I bought a set of stainless nuts from James Paddock 4 years or so ago because my original nuts were alloy. I have only just come to fit them properly as I have been rebuilding the car. I find that they are smaller than the originals and leave the wheels looser. My findings are:-
My measurements of the original aluminium nuts which I still have are:-
- Diameter of the shank which enters the wheel – 18.7mm approx.
- Diameter of the flange which contacts the wheel – 30.1/30.2mm approx.
- Diameter of the shank which enters the wheel – 17.9mm approx.
- Diameter of the flange which contacts the wheel – 28mm approx.
Observation 2:- It seems that with some of my original wheels/nuts it is the outer diameter of the flange in the recess of the wheel which centralises the wheel so the reduction of this diameter by over 2 mm will stop this happening. Also the flange is what holds the wheel on so should not be reduced in diameter and therefore area as that will be more likely to permit a wheel to come loose.
Observation 3:- In addition to the dimensional differences in 1 and 2 above, the original nuts have a taper at the junction of the flange and the shank going from the 18.7mm of the shank to 20.5mm approx.. This is presumably there to provide some form of centring. The nuts you supplied have no such taper.
Apart from the dimensional errors and design changes above not necessarily centring the wheel correctly and causing imbalance I do not consider them fit for purpose from a safety point of view as they are more likely to permit movement of the wheel and loosening of the nuts.
I reported this to the supplier and thy say that they supplied almost 1000 last year and had no complaints. They say that as far as they know there is only one source for these nuts so can't supply alternatives but will give me a refund.
Is anyone aware of a solution to this?
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