Tyre Eng Certificates

Submitted: Tuesday, Jun 06, 2006 at 11:27
ThreadID: 34671 Views:2230 Replies:5 FollowUps:11
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G'day All

Following a few posts on the subject of legal/illegal tyre sizes I have checked out getting a engineering certificate for the 285/75R16 (33in) tyres I have on my Patrol which has a placcarded tyre size of 265/75R16 (31.5in), after a number of phone calls and emails the basic procedure is; I make an appointment with one of the Transport SA registered vehicle engineers they check that the rolling diameter is within the allowable speedo error, check that the tyres don't not foul on the body or suspension, check the load ratings. I pay approximately $330 and they give me a custom tyre placcard and certificate for the vehicle. So in short I next time I am in the big smoke I will probably fork out the money for peace of mind because I like my bigger tyres.

On a related matter, what is the best price anyone has found in SA recently for 285/75R16 Goodyear MTR's?

Cheers

Snowy
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Reply By: Member - 'Lucy' - Tuesday, Jun 06, 2006 at 12:05

Tuesday, Jun 06, 2006 at 12:05
Snowy

There is usually a braking test involved in this scenario.

Just check this aspect before you launch off, because if it isrequrired you may have to have your brakes serviced before undergoing the subject engineering scrutiny.

Ken Robinson.
AnswerID: 177002

Follow Up By: Truckster (Vic) - Tuesday, Jun 06, 2006 at 14:17

Tuesday, Jun 06, 2006 at 14:17
who did you use for yours?
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FollowupID: 433038

Follow Up By: Member - 'Lucy' - Tuesday, Jun 06, 2006 at 19:02

Tuesday, Jun 06, 2006 at 19:02
Ian Prain in Pakenham

Vicroads accredited which is 95% of the 'battle'
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Follow Up By: Truckster (Vic) - Wednesday, Jun 07, 2006 at 12:28

Wednesday, Jun 07, 2006 at 12:28
contact info?
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Reply By: brian - Tuesday, Jun 06, 2006 at 14:11

Tuesday, Jun 06, 2006 at 14:11
Are 285,s illegal do you need a certificate they are only 15 mm taller than std and i thought you could get a sticker from nissan specifing 285,s as they are used on other models std,maybe i am wrong anyone know for sure...im in nsw.BTW quoted $340 for 285,S here yesterday.
AnswerID: 177023

Follow Up By: Truckster (Vic) - Tuesday, Jun 06, 2006 at 14:19

Tuesday, Jun 06, 2006 at 14:19
depends if they go on measured size (some 285's are bigger than others), or marked size of 285.
but yes you do need a cert.
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FollowupID: 433039

Follow Up By: Robin - Tuesday, Jun 06, 2006 at 16:02

Tuesday, Jun 06, 2006 at 16:02
Brian

facts are

1/ 285's are more than 15mm taller than the most common standard GU(275/70/16), and taller again than 265/70/16 which is often on 3lt.

2/ The alternnate placard is for 265/75/16 which is about 5mm taller than standard. (275/70/16)

3/Nissan does not use 285 on other model patrols

4/ As per Truckster - their is up to 10mm difference in 285 tyre diameter and also wheel rim spec - e.g. X Terrains require only 7in rims and everyone else uses 8in

4/ Depending on model - check your handbook - in back of my handbook it refers to an overseas model using 245/85/16 which is a much larger tyye.
I rely on this clause and victorian guidelines which allow 15mm bigger than biggest used on other models , and hence get away with use of even larger diameter tyres than 285 (255/85/16) without a certificate.

Can't comment on other states guidlines

Robin Miller


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Follow Up By: brian - Tuesday, Jun 06, 2006 at 17:21

Tuesday, Jun 06, 2006 at 17:21
Robin thanky for setting me straight you are right i was wrong goodyears 285 are 840mm and 265 are 810mm when new ie 30 mm difference.

Still wonder if this difference further affects low speed gearing noticeably,mine is too high geared in my view,but i am told the 4.2 is even higher geared in first gear than the 3litre is that true do you know??
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Follow Up By: Robin - Wednesday, Jun 07, 2006 at 08:19

Wednesday, Jun 07, 2006 at 08:19
Hi Brian

Yes the 4.2 has same 4.26 1st gear ratio as 3lt (models around 2002) but has a final drive of 3.9 compared to the 3lt & 4800's 4.375, so it has less
rev's.

Going up in tyre size clearly makes it harder to get off the line
but many seem to cope with this change ok.

See how you go taking off in second gear - its not as bad as that but
this gives some idea.

A good dynotune can negate the effect of larger tyres.

Robin Miller
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FollowupID: 433152

Reply By: SA_Patrol - Tuesday, Jun 06, 2006 at 16:26

Tuesday, Jun 06, 2006 at 16:26
285/75R16 Goodyear MTR's? $ 279.00 from Beaurepairs in Gouger St Adelaide I got that as a trade price. plus I paid an extra $16.00 per tyre for insurance which covers m for 4 years / 80,000kms and all puntures repaired free of charge

AnswerID: 177052

Follow Up By: Truckster (Vic) - Wednesday, Jun 07, 2006 at 12:30

Wednesday, Jun 07, 2006 at 12:30
$279 Trade?
Makes my $265 walk in off the street price on Friday outstanding!
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FollowupID: 433203

Reply By: Member - Troll 81 (QLD) - Wednesday, Jun 07, 2006 at 00:36

Wednesday, Jun 07, 2006 at 00:36
I am not so sure about all this stuff anymore. When I got my patrol second hand from a car yard it came with 295x75R16. Them selling me a car like that tells me everything in the truck is legal and I should not be worried about a thing
AnswerID: 177137

Follow Up By: Pajman Pete (SA) - Wednesday, Jun 07, 2006 at 08:22

Wednesday, Jun 07, 2006 at 08:22
Would you like to buy a bridge in Sydney?
Any mug can be uncomfortable out bush

Member
My Profile  My Blog  My Position  Send Message

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FollowupID: 433153

Follow Up By: Member - Troll 81 (QLD) - Wednesday, Jun 07, 2006 at 08:49

Wednesday, Jun 07, 2006 at 08:49
If I get a safety certificate with the car it means it's roadworthy and legal
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FollowupID: 433159

Follow Up By: Truckster (Vic) - Wednesday, Jun 07, 2006 at 12:31

Wednesday, Jun 07, 2006 at 12:31
You have never heard of dodgey roadys?

Just cause thats how they sold it to you doesnt make it legal or roadworthy. They can say that you changed the tires, and your gone. your word against theirs..

Whats the oldest rule? Ignorance of the law is no excuse?
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FollowupID: 433204

Reply By: Al & Mrs Al (Vic) - Wednesday, Jun 07, 2006 at 12:41

Wednesday, Jun 07, 2006 at 12:41
Hi there

Al sold his Dual Cab with a roadworthy with 285/75/16 Cooper Sts on it, that didn't pass the engineers report 6 months earlier.

Lyn
AnswerID: 177209

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