80 Series & Tyre Load Index

Submitted: Monday, Jul 21, 2003 at 15:03
ThreadID: 6091 Views:4565 Replies:5 FollowUps:13
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Just going through the process of buying new tyres. Currently I have Olympic Overlander 31 x 10.50R15LT with a load index of 109S. I have completed over 100000kms on all types of road surface throughout Australia with no punctures on these tyres. I am looking at the Cooper ST 31 x 10.50R15LT with a load index of 109Q.

The issue is this. I have just been informed that neither tyre actually conforms with my 80 Series Cruiser, as it has a load index of 112S on the door frame.

My question is, does anyone else with 15 inch rims have tyres that are under the vehicles load index? If so have you had any problems with insurance, roadworthyness, punctures, blowouts etc?

The Olympics were put on the truck by the Toyota dealer on purchase, and it passed a roadworthy, as well as the insurance company insuring it, but are there any other implications for me if a purchase a tyre that is under the vehicle load index?Just Do It!

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Reply By: jonny knowalittlebit - Monday, Jul 21, 2003 at 16:34

Monday, Jul 21, 2003 at 16:34
just went through all this crap myself went to a tire dealer and they put 109q on when they should of been 110s see i didnt know anything about load speed rating until rohans thread about insurance and stuff.
now with the RTA i rang them and they said it would be fine if you got an engineers ticket but i didnt look that far into it i just rang the tire dealers up and said what they did and they put the correct tires on.
With a road worthy i take it your talking about a pink slip and they only check tread not the load speed rating. Now with insurance they wont cover you if your car is unroadworthy now if you want to take the risk of them not checking your tires go for it but in a ding it takes 2 sec to check the tires and then you placard so i bet your bottom dollar they would. Now how much would you want for your rig $30000 (i dont know just guessing) now to get the proper tires it might not cost anything more or maybe $10/tire =$40 thats if they come in that size not to sure but its well and truelly worth it considering insurance companies would no doubt look at getting out of paying anyway they can and that would be one way.
personally i wouldnt risk it. but at the same time and engineer might ok it then you might have to check with your insurance company.
AnswerID: 25500

Reply By: diamond (bendigo) - Monday, Jul 21, 2003 at 17:59

Monday, Jul 21, 2003 at 17:59
gday john.
vic laws state that the minimum load rating on your vehicle placard is the minimum you can fit.end of story.i just had a huge blue with another tyre place up here about load ratings on cars.he was wrong lol.
and as said above insurance null and void if wrong tyres on.
new job coming so no fraser this time:-((
AnswerID: 25506

Follow Up By: Member - Glenn(VIC) - Tuesday, Jul 22, 2003 at 10:25

Tuesday, Jul 22, 2003 at 10:25
Hi Diamond,

I may be incorrect in assuming that this is your line of business, and I apologise in advance if I am wrong, but do you know of any all terrain light truck radial tyres that fit a 15" rim and have a load index of 112S?Just Do It!

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FollowupID: 17334

Reply By: Steve from Drive Systems Victoria - Monday, Jul 21, 2003 at 19:35

Monday, Jul 21, 2003 at 19:35
Glenn, just to be a pain in the arse, have you informed your insurance company that you have changed wheel types, given that you quote a 31/10.5x15 means you must be running 8" or 7" white spokers, which were not standard fare in the first place?
AnswerID: 25518

Follow Up By: Member - DOZER- Monday, Jul 21, 2003 at 20:40

Monday, Jul 21, 2003 at 20:40
Hi If its a GXL, they come std with 15x7 chromies
Andrewwheredayathinkwer mike?
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FollowupID: 17300

Follow Up By: diamond (bendigo) - Monday, Jul 21, 2003 at 20:43

Monday, Jul 21, 2003 at 20:43
gday steve.
in vic your alowed 1" in width over standard.
cruiser come with 6" or 7".
31" tyres only need 7" rims so it shouldnt be a problem.new job coming so no fraser this time:-((
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FollowupID: 17301

Follow Up By: Steve from Drive Systems Victoria - Tuesday, Jul 22, 2003 at 10:10

Tuesday, Jul 22, 2003 at 10:10
It's 1.5" actually, but my point was, if he has changed rim types (ie white spoke), other than factory rims, he should inform his insurance company.
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FollowupID: 17331

Follow Up By: Member - Glenn(VIC) - Tuesday, Jul 22, 2003 at 10:39

Tuesday, Jul 22, 2003 at 10:39
Hi Steve,

I am running the standard 15x7 chromes.Just Do It!

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FollowupID: 17337

Follow Up By: diamond (bendigo) - Tuesday, Jul 22, 2003 at 13:14

Tuesday, Jul 22, 2003 at 13:14
sorry steve its actually 1" wider than wheel offered on the vehicle.
the actual allowed is 25 mm.new job coming so no fraser this time:-((
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FollowupID: 17354

Follow Up By: Steve from Drive Systems Victoria - Tuesday, Jul 22, 2003 at 13:28

Tuesday, Jul 22, 2003 at 13:28
Well Mr. Diamond, my sources dispute this, and I reconfirm it's 1.5" over factory. Explains why you do not have any problems with Vicroads when going from a 5.5" split rim to a 7" drop-centre rim. Going to 8" presents rego and insurance hassles. On the flip side of this; if the manufacturer offers an 8" wheel on a similiar model (eg Nissan Patrol), then 9.5" is also legally allowable as far as rego is concerned,But, just try and get insurance approval with 9.5" rims and see how you go!!!!
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FollowupID: 17355

Follow Up By: diamond (bendigo) - Tuesday, Jul 22, 2003 at 18:08

Tuesday, Jul 22, 2003 at 18:08
sorry again steve.
your sources are wrong.
acording to vic roads vsi8(modifications)from my vsi book when i got my roadworthy testers licence.
section (b).
rim width increase must not be more than 25mm greater than the widest wheel offered by vehicle manufacturer for that model.
also adr24 mentions it as well.new job coming so no fraser this time:-((
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FollowupID: 17371

Follow Up By: Steve from Drive Systems Victoria - Tuesday, Jul 22, 2003 at 21:36

Tuesday, Jul 22, 2003 at 21:36
Hmmm, a conumdrum no less. Are you positive that section is regarding rim widths and not offsets?
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FollowupID: 17391

Follow Up By: diamond (bendigo) - Tuesday, Jul 22, 2003 at 21:53

Tuesday, Jul 22, 2003 at 21:53
gday again.
nothing worse than a conumdrum.lol
no wheel offsets come under a different vsi.
im 100% sure on rim size.
i deal with it day in and day out.
always arguing with customers over what wheels allowed and whats not so i show them the law and in most cases people happy.
theres lots that i dont agree with eg.i have gq3ltr only wheel allowed for that vehicle is 16x6 so i can only go 7". but other patrols have 16x7 option but i cant fit 8" therefore no 33x12.5x15 for mine.
not saying laws right but laws the law.new job coming so no fraser this time:-((
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FollowupID: 17395

Follow Up By: Member - DOZER- Tuesday, Jul 22, 2003 at 22:05

Tuesday, Jul 22, 2003 at 22:05
Hi Dimond
Are you legally allowed to put 255x85x16 on the 16x7 you can run?
These BFG muddies are 33 and a third inches diameter, but relatively skinny at 7 inches wide.
Andrewwheredayathinkwer mike?
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FollowupID: 17397

Follow Up By: Steve from Drive Systems Victoria - Wednesday, Jul 23, 2003 at 09:58

Wednesday, Jul 23, 2003 at 09:58
OK, I stand corrected. Must have been a change in allowable width when they "metricated" the laws. Seeing as your GQ model was also fitted with 15x7 (4.2 petrol + diesel), why can't you go to 15x8 ??
Or alternatively, run 255/85x16 on a 7" rim, which is a better tyre combo than 12.5/33 anyway, does not require flares to cover them and is a lighter assembly in regards to unsprung weight??
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FollowupID: 17410

Follow Up By: diamond (bendigo) - Wednesday, Jul 23, 2003 at 13:16

Wednesday, Jul 23, 2003 at 13:16
gday again steve.
once again this is where the problem lies.
gq with the 3lt motor never had 15x7 wheels only 16x6.
this is where the law says largest wheel option on perticular model.
even thou its the same everything except motor as 4.2 im not aloowed to fit 8"new job coming so no fraser this time:-((
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FollowupID: 17421

Reply By: charlie - Monday, Jul 21, 2003 at 22:11

Monday, Jul 21, 2003 at 22:11
Just went through this myself. I bought the car with some crappy korean or something 31 x 10.5 x 15 on it and one gave up and bubled out after apparently 35 - 40k. Looked around and found only a couple of 265 / 70 15's that had the load rating. I couldn't find and 31's that were up to the task. A couple of tyre blokes here in Bris said straight away that I had the wrong tyres and they would not recommed ggoing back to the 31's as insurance will not cover.

I looked around for a long time and finally put 16 inch wheels on and got cooper discoverer ST's and they are great. There are more tyres to choose from in this size however some are more expensive. The vast majority though are up to the load rating.

Toyota must have had deal going with Dunlop when they originally put the 15 x 7 chrome wheels on because there are very few metric tyres or imerial tyres around that will do the job. Not even BFG allterains all the way up to 12.5 x 33 are up to the task on the 80 series.

Anyway got the new wheels and they are nice and shiny aswell so I am happy.

Good luck,
Charlie
AnswerID: 25547

Reply By: diamond (bendigo) - Tuesday, Jul 22, 2003 at 13:25

Tuesday, Jul 22, 2003 at 13:25
gday glenn.
what tyre size does it actually does it say on your tyre placard its just not many cruisers came out with 31x10.5x15 standard.new job coming so no fraser this time:-((
AnswerID: 25602

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