tyres and saftey
Submitted: Friday, Jan 09, 2004 at 13:35
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10 Para
Just finished ready the 4X4 Mag and in particular the Ron Moon story with the set up of his rig and noticed that he is running 285/75/R16 size tyres on his partol( also on his web site) and he explains how he has had a Gearmaster trasfer case fitted offset the effects in low range, however he does not explain how he has got over the fact that now his speedo will be out by about 15% and that the brakes on the patrol might not be as good as they were also turning could be affected, and last but not least is it legal also could suffer on
hill starts and pulling up
hill.
I called a tyre outfit today and asked them if they would fit the same tyres to my patrol and the answer was no way its not legal.
can someone clear this up for me.
Home For Xmas
Reply By: Mark - Friday, Jan 09, 2004 at 14:21
Friday, Jan 09, 2004 at 14:21
I have a GU patrol with 285/75R16 Cooper ST's. I have checked the speedo with my Garmin V GPS and its within 1 km/kr at 100km/hr. The speedo was WAY optimistic with the standard tyres (perhaps thats why others report fuel economy I cannot achieve!!!).
As for braking, I also have ABS and whether the tyre size affects things I do not know. But to my way of thinking, if a 25mm (3.5%) increase in radius is going to make the brakes unsuitable, then they are way marginable in the first place. Overloading the vehicle would make MUCH more difference IMHO. It is rated for 3000kg vehicle AND 750kg tow (unbraked), so there should be plenty in reserve. Theoretically, if 3.5% under the maximum load limit, it should be within spec (perhaps by de-rating maximum load would bigger tyres be acceptable???)
It appears to brake normally, and was told when fitting the tyres that it was fine to do so by Tyrepower. I am not sure about the legality with insurance, perhaps I don't want to know!!! Its insured through my work (novated lease) and bottom line is I do not know the details.
Cheers
Mark
AnswerID:
42354
Reply By: chrisfrd - Friday, Jan 09, 2004 at 14:21
Friday, Jan 09, 2004 at 14:21
4x4 monthly addressed this issue this month!
In fact, the vehicle is not legal, as it is running tyres to which it was not origionally fitted with. (ADR 24!). The only way to comply with the intent of the ruling is to re-engineer the truck completely.
That would be to upgrade the braking system, (probably just change the pads over), and to change the diff ratios to get the speedo reading correctly.
The only way to do this effectively are crown wheel/pinion changes. Look at $1900 for that. That's about the same price as the gearmaster t-case gears!
By the way, Nissan design their speedo systems to read UNDER, typically by 10%, so he would only be out by 5% if everything went to plan.
AnswerID:
42355
Follow Up By: jackablue - Friday, Jan 09, 2004 at 14:49
Friday, Jan 09, 2004 at 14:49
chrisfrd
I was told by another GU driver that you can get another tyre standard placard from NIssan for the GU. for a small fee. I haven't questioned him further on it though. Wont be seeing him until Feb.
Cheers
Jackablue
FollowupID:
304807
Follow Up By: Member - Kevin (NSW/ACT) - Friday, Jan 09, 2004 at 16:17
Friday, Jan 09, 2004 at 16:17
Standard GU placard is for 265/70R16 - you can buy one for a 265/75R16 tyre (same as on utes).
Cheers
KevinKevin - sitting here, thinking of there
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2002 GU Patrol ST 4.2TD
2000 15' Supreme Getaway
FollowupID:
304815
Follow Up By: chrisfrd - Friday, Jan 09, 2004 at 16:23
Friday, Jan 09, 2004 at 16:23
G'day...
The vehicle ADR compliance details, as recorded by DOTRS (www.dotrs.gov.au) would indicate a truck fitted with such tyres. Not the 285's that Moonie fitted.
If you had an engineers compliance plate, you could change the tyres over to whatever you wanted. I would suggest that there's probably no reason to get booked with 285's on the truck, but if you had a crash and were at odds with the insurance company (as we normally are!) then they could use this as an out with regards to their obligations!
FollowupID:
304817
Follow Up By: Brian - Saturday, Jan 10, 2004 at 11:18
Saturday, Jan 10, 2004 at 11:18
How do you go about this tyre placard?
Do you just buy it or have to get them to certify it to the vehicle?
Brian
FollowupID:
304889
Follow Up By: Member - Kevin (NSW/ACT) - Monday, Jan 12, 2004 at 10:05
Monday, Jan 12, 2004 at 10:05
It's a genuine Nissan spare part - Number 99090VB000A - and
mine cost $17.40 in February 2003.
CheersKevin - sitting here, thinking of there
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2002 GU Patrol ST 4.2TD
2000 15' Supreme Getaway
FollowupID:
305015