Tyre load ratings

Submitted: Saturday, Feb 25, 2006 at 10:46

ThreadID: 31136 Views:7958 Replies:1 FollowUps:6

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Member - Norm C (QLD)

I posted this as a follow up on another thread, but thought I'd put it in another subject so it gets seen a bit more. Hope someone out there has some real knowledge and suggestions on this:

My vehicle plaque ('05 Hilux) doesn't give a tyre load rating. It just says the sum of the load capacities of tyres fitted to an axle or axle group is to be not less than 1255 KG front or 1600 KG rear. Referring to the Cooper website, 800 KG load (half of 1600) requires a 100 load rated tyre.

The manual however says 112/110S. I am guessing this means if your tyre is speed rated S, then 110 load rating is OK, otherwise 112 is required.

No one that I can find makes a 112 or 110S tyre in 31/10.5/15. The BFG is 109S and the Cooper ST is 109Q(below S). The nearest I can find is the Cooper ATR in 265/75/15 which is a bit smaller than the 31 and with a less aggressive tread, so likely to be not as good off road as the BFG or ST.

The local BOB Jane Sales Manager says 'mmm, thats interesting. I reckon the 109Q would be OK, but I can't be certain'.

Haven't spoken to the Toyota agent yet, but don't expect any real knowledge there.

Any tyre experts out there who can help?

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Reply By: Hero - Saturday, Feb 25, 2006 at 11:49

Saturday, Feb 25, 2006 at 11:49

Had this exact experience with he 04 Hilux, Your quoted reading: "the sum of the load capacities of tyres fitted to an axle or axle group is to be not less than 1255 KG front or 1600 KG rear." This is the magic loophole.

Divide the 1600 by 2, giving you 800kg, the fitted tyre must not be below the load rating of this 800kg. This statement overides the placarded 112S, or the original tyre fitted. Most 31x10.5R15 tyres are rated around 109S, the minimum requirement in this case would be 104.

Dont worry you are not alone, and you will have no problems with the fitment.

AnswerID: 156991

Follow Up By: Member - Norm C (QLD) - Saturday, Feb 25, 2006 at 12:08

Saturday, Feb 25, 2006 at 12:08

Thanks Hero, not worried about the fitment or necessarily looking for a loophole. More worried about the safety when fully loaded and the insurance if bleep happens.

I suspect the tyres will be fine though and there aren't many options if I try to stay with the 112s.

According to my info, 109s are rated to 1030KG, well above the placarded 800KG per wheel.

FollowupID: 411159

Follow Up By: Member - David B (QLD) - Saturday, Feb 25, 2006 at 12:11

Saturday, Feb 25, 2006 at 12:11

I agree.

FollowupID: 411160

Follow Up By: Member - Norm C (QLD) - Saturday, Feb 25, 2006 at 12:24

Saturday, Feb 25, 2006 at 12:24

David, looks like BFG 31s on yours? Going OK?
Are you interested in an SR5 alloy that matches those on your vehicle to put your spare on? That way you can do a full 5 wheel rotation.
I posted about this on another thread yesterday. I'll probably have a couple of spares soon.

FollowupID: 411162