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Old 11-21-2021, 09:37 PM #1
kaitlyn2004 kaitlyn2004 is offline
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Any idea why manual says chains 5mm?

The 4runner manual, among other notices, says the chain diameter should not exceed 5mm. I've never seen this mentioned for other cars - mainly it seems to be about internal clearance issues... which is why I think there are "Class S" chains designed for minimal clearance?

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Use the correct tire chain size when mounting the tire chains.
Chain size is regulated for each tire size.
Side chain
(0.20 in. [5 mm] in diameter)
Cross chain
(0.20 in. [5 mm] in diameter)
I was looking at these:
2521Q - Light Truck Diamond Back Square Link (Rubber Adjuster Style) | Quality Chain Corp

They come in a "lightweight" 3.7mm version as well, but surely given the option the 5.5mm is the "better" option, but also technically exceeds the 5mm stated.

Thoughts?
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Old 11-21-2021, 11:56 PM #2
fkheath fkheath is offline
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I think 5mm is the diameter of the "wire" used to make each loop in the chain. That is almost a 1/4". Pretty hefty.
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Old 11-22-2021, 05:38 AM #3
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It has to do with clearance of the stock oem tire and the components (upper control arm, etc) behind the tire and wheel well.

I found that if you put a lift on a vehicle it will allow greater clearance for bigger sizes of chains.

Here's a 4.5mm diamond chain that ought to work:
P265/70R17, P265/70 17 TUV 4.5mm Diamond Tire Chains - TireChain.com

They also come in 3.8mm
265/70R17LT, 265/70 17LT TUV Diamond Tire Chains set of 2 - TireChain.com

I don't currently have snow chains for my 4Runner as I'm not locked in on my tire size. I still want to go bigger and think buying chains now would be a waste.

I do have diamond style chains for my 15 year old Nissan Frontier and have used them.
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