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Old 02-20-2015, 04:28 AM
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MOPAR lock nuts different weight to stock nuts

Hi all from down under. When I bought the genuine MOPAR lock nuts (part # 82212564) from the local dealer they said I wouldn't need to balance the wheel afterwards.

When I weighed the nuts on the digital kitchen scales they were 77g (2.7 oz) vs stock nuts at 106g (3.7 oz). I have the 20" standard Limited 5-spoke wheels - "polished aluminium with mineral grey pockets".

Surely this is a huge weight difference at high rotations and would cause vibrations. The dealer says they haven't had any issues, and in any case, there is no other lock nut. Then again, apparently very few people buy them (they had to order it in). I just can't understand from a physics point of view how it's a good idea to have such unbalanced weights at high rotational velocities. Surely it contributes to metal fatigue and vibration on the hub assembly/axle.

Has anyone had any experience? Thanks.
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Old 02-20-2015, 08:28 AM
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Re: MOPAR lock nuts different weight to stock nuts

I don't think you need worry as the new weights each weigh the same as each other. If you mixed in some of the old nuts with the new ones then there would be an unbalanced condition.

Think about changing the stock wheels for lighter wheels. No unbalanced condition created then either.

Dan
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Old 02-20-2015, 08:50 AM
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Re: MOPAR lock nuts different weight to stock nuts

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Originally Posted by Lightninrod View Post
I don't think you need worry as the new weights each weigh the same as each other. If you mixed in some of the old nuts with the new ones then there would be an unbalanced condition.

What Dan said PLUS... the nuts are not attached to the wheel during balancing.

-john


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Old 02-20-2015, 09:26 AM
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Re: MOPAR lock nuts different weight to stock nuts

You are absolutely correct in assuming that 30g or around an ounce would throw the balance off...wheel weights are available in increments to offset smaller imbalances. So yes an ounce is enough, however the closer the weight is to the outer edge the greater the effect it has and the reverse is true. As this weight is located so close to center its effect will be negligible, but still measurable. I guess in a way the nuts are the hub too.. Another discussion. There's a bunch of science stuff centri something or other, but nah you'll be fine is the simplest answer. I don't use locking nuts. I don't live in NJ anymore and have a GPS that has a no ghetto route feature.
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Old 02-20-2015, 10:14 AM
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MOPAR lock nuts different weight to stock nuts

I swear I felt less vibration in my steering wheel going from the Mopar locks to Gorilla locks on my previous WK. Granted I only changed one lug nut per rim to a lock and all the rest were OEM lug nuts.

The gorilla (chrome) lock nut was significantly lighter than the Mopar lock nut, using my hand for comparison.


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Old 02-20-2015, 07:53 PM
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Re: MOPAR lock nuts different weight to stock nuts

Quote:
Originally Posted by Lightninrod View Post
I don't think you need worry as the new weights each weigh the same as each other. If you mixed in some of the old nuts with the new ones then there would be an unbalanced condition.

Think about changing the stock wheels for lighter wheels. No unbalanced condition created then either.

Dan
I don't understand how changing stock wheels to lighter ones will fix the problem, when the stock lug nuts are already much lighter than the lock nuts.

Regarding your first sentence, unfortunately that would mean I would need to buy 4 packs of lock nuts (total 20), which would cost $450 AUD (almost $400US) for me. My understanding is that each set comes with a unique key - at least that's what it says on the packaging, with a unique serial number to register with McGard in case you lose the key. Imagine the pain of having to have 4 separate keys for the lock nuts (one for each wheel). The mechanics who rotate my tyres every 6 monthly service will no doubt lose one of them and have to grind off the nuts. Apart from the pain of having to have 4 separate keys for the lock nuts (one for each wheel).
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