Changing Tyre Size on a GU

Submitted: Monday, Jan 31, 2005 at 09:23
ThreadID: 19944 Views:1908 Replies:8 FollowUps:20
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I tried to search for this subject with not much success.

Has any GU Nissan owners out there gone up a tyre size and if so what size and what make.

I am very unhappy with a set of Bridgstone that came with my car, 24000km and the rears need changing, Bridgstone are going to look at them tomorrow with a view to replacing them so I thought I would change the size. Might help to bring the speedo in line with the GPS.
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Reply By: GUPatrol - Monday, Jan 31, 2005 at 09:51

Monday, Jan 31, 2005 at 09:51
I changed mine to 265/75 16, Nissan sells the new tyre placard with this size so that your insurance company can't complain.
AnswerID: 95779

Follow Up By: Michael ( Moss Vale NSW) - Monday, Jan 31, 2005 at 15:25

Monday, Jan 31, 2005 at 15:25
Yes, 265/75 16 is the go, very popular size if you have to buy one out in the never never. Even if you have to settle for a used tyre, you still have more chance of being that size. Believe it or not, it makes a fair difference to the height iof the vehicle.. Michael.
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Reply By: Leroy - Monday, Jan 31, 2005 at 09:58

Monday, Jan 31, 2005 at 09:58
Algee,
I went up to 285*75 and Im happy with that.

Leroy
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Follow Up By: Member - Roachie (SA) - Monday, Jan 31, 2005 at 10:06

Monday, Jan 31, 2005 at 10:06
Leroy,

Thinking about going from 265/75 to 285/75 on my 4.2T/D as well. What motor do you have in yours? as I am a bit concerned the slightly bigger size might make the old girl even more sluggish?

Thanks.
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Follow Up By: Leroy - Monday, Jan 31, 2005 at 10:53

Monday, Jan 31, 2005 at 10:53
Roachie,

One of your favorites.....3.0l lol Mate's got same tyres on his 4.2td and it turns them ok. I've driven it and it's certainly 'no powerhouse' but we are looking for a bit more air between the diff and the ground as the vic high country is where we play. Prob not a real issue where you are.
Someone else may be better to answer your question as to sluggishness.

Leroy
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Follow Up By: davidta - Monday, Jan 31, 2005 at 11:50

Monday, Jan 31, 2005 at 11:50
Hi

I too have a 3 L with 265/75 & was thinking of going to 285/75/ Is the difference in engine power & braking really noticable ? I imagine you would get less engine braking with bigger tyres, but is it really noticable ?
Thanks
David
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Follow Up By: Leroy - Monday, Jan 31, 2005 at 12:18

Monday, Jan 31, 2005 at 12:18
David,

I don't have a problem with engine braking/power but I supose it's subjective. Bro in law bought some 35" Simex and reckons it hasn't effected power or engine braking all that much but braking (using the pedal) he has noticed a significant increase in the stopping distance! I'm yet to try his tyres on my truck to confirm all this.

Leroy
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Follow Up By: Brian - Monday, Jan 31, 2005 at 12:43

Monday, Jan 31, 2005 at 12:43
Algee I went up to 285/75/16 and Regret the move should have gone to 265/75/16.
Why? The loss over power was a bit much, I have to change gears sooner when going up hill.
Other than the loss in power I love the tyres Grip ride Wear!

Brian
2001 4.2TD Wagon 285/75-16 BFG AT's
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Follow Up By: Happy GU Owner - Monday, Jan 31, 2005 at 14:44

Monday, Jan 31, 2005 at 14:44
Roachie,

If our little old 3 Litre's can push 285's surely your 4.2 should be able to do the same -- wink,wink

Mic
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Follow Up By: Brian - Monday, Jan 31, 2005 at 15:14

Monday, Jan 31, 2005 at 15:14
I didn't say it wouldn't push the 285's it does and well but it was even better with the 265's

Brian
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Follow Up By: Member - Roachie (SA) - Monday, Jan 31, 2005 at 20:57

Monday, Jan 31, 2005 at 20:57
Yeh it's a worry alright. I'm also tempted to go for 315/75s and change the diff ratios so it'll pull as good as standard. The 285s are a bit of a compromise, not big enough to warrant the diff ratios changed, but big enough to probably cause me some angst with hill climbs; cripes even now I find 1st gear is too high (high range) when it shouldn't be!!! lolol
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Follow Up By: Member - Roachie (SA) - Monday, Jan 31, 2005 at 22:59

Monday, Jan 31, 2005 at 22:59
G'day Brian,
I've just been checking out the response down the bottom of this post from Andrew. In it he quotes some links to the Patrol Group site and in some of those there is a Brian who was contemplating buying 285s (about september 2004 I think).....was that you by any chance?
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Follow Up By: Brian - Tuesday, Feb 01, 2005 at 08:08

Tuesday, Feb 01, 2005 at 08:08
Roachie
I was contemplating 285's and did buy 285/75-16 BFG AT's but it was in Jan 04. I statred to reaserch in Sept 03.
Send me the link and I will look

Brian
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Follow Up By: Brian - Tuesday, Feb 01, 2005 at 08:17

Tuesday, Feb 01, 2005 at 08:17
Found the links
Yeh thats me but the date is wrong as I definatly fitted them in Jan 04

Brian
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Follow Up By: Andrew - Tuesday, Feb 01, 2005 at 09:59

Tuesday, Feb 01, 2005 at 09:59
Brian

Those messages are archives from the Patrol Yahoo Group that have been sorted into threads for the new Forum. We are (slowly) creating a huge database of info.
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Follow Up By: Member - Roachie (SA) - Tuesday, Feb 01, 2005 at 12:01

Tuesday, Feb 01, 2005 at 12:01
Andrew,

I joined up to the Patrol group last night....now all I've gotta do is find time to get involved.

Seems like a great site with lots of useful input.....and no d i c k heads!!
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Reply By: flappan - Monday, Jan 31, 2005 at 10:04

Monday, Jan 31, 2005 at 10:04
I've got 265/75 's and happy with those.

A mate went to 285/75's and is happy , but another mate tried those , and went back to 265/75.

The speedo is almost spot on up to 100.
AnswerID: 95786

Follow Up By: davidta - Monday, Jan 31, 2005 at 11:51

Monday, Jan 31, 2005 at 11:51
Hi

Why did he go back to 265 and what vehicle / motor was it ?
Thanks

David
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Follow Up By: flappan - Monday, Jan 31, 2005 at 12:09

Monday, Jan 31, 2005 at 12:09
It was on a 4.2TD , and they were Muddies as I recall.

He just felt that the bigger tyres , especially muddies , just made the steering a bit vague , and unpleasant to drive.

I think for his use , the extra clearance didn't warrant the handling issues.

The other mate fitted BFG AT's.
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Reply By: DARREN - Monday, Jan 31, 2005 at 13:25

Monday, Jan 31, 2005 at 13:25
I have had 295/75 Coopers ST 16's on my 3.0 GU since new (at Leroy's suggestion actually) now almost up to 50,000km and will replace with the same when needed in another 20,000 or so.
AnswerID: 95833

Follow Up By: Leroy - Monday, Jan 31, 2005 at 13:56

Monday, Jan 31, 2005 at 13:56
285/75 actually.....but lets leave him with the illusion that he has bigger lol

Leroy
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Reply By: Happy GU Owner - Monday, Jan 31, 2005 at 14:40

Monday, Jan 31, 2005 at 14:40
Algee,

Definately go for a bigger tyre size. I have had both 265 and 285's on my two 3 Litre DI Patrols and the motor pushes them both along very well, whilst noticing a slight power drop from the 265's to the 285's.

The 265's are generally cheaper than the standard size tyres on the Patrol, are available from more remote locations, give you another centimetre or so ground clearance to the bottom of the diff, and you will notice hardly any difference in drivability. With all of these reasons behind you, I would definately 100% say change up.

With the 285's, you get another centimetre or so clearance to the diff, but more expensive tyres, a slight reduction in power ( drove my brother-in-laws identical car, his with 285's and mine with 265's, side by side, and even with the power loss, decided it was worth changing up to 285's for my type of driving since I keep damaging my side steps walking the vehicle through deep holes. )

Next step is to decide on what brand/type --- that's even more fun than trying to get the right size!!!

Mic
AnswerID: 95846

Reply By: Michael ( Moss Vale NSW) - Monday, Jan 31, 2005 at 15:30

Monday, Jan 31, 2005 at 15:30
Hey roachie, with that bulging machine of your and towing i reckon you may be cursing it for the next 80,000 ks, i went to 265/75 16 and it does affect takeoff compared to the standard tyres even though its only about 3% bigger. I also noticed low first was worse. Michael
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AnswerID: 95857

Follow Up By: Member - Roachie (SA) - Monday, Jan 31, 2005 at 21:06

Monday, Jan 31, 2005 at 21:06
80,000 ks................Jeez Michael, I'm lucky to get half that distance out of any tyres I've ever had...hahahaha.

But I think you're probably spot-on. I'd love to have bigger tyres (for pose value as much as anything..lolol) but not at the expense of performance and also availability in remote places (even though I don't think the latter is really an issue, cos I carry 3 spares and have NEVER had to buy a tyre in a remote location).

Cya mate
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Reply By: Andrew - Monday, Jan 31, 2005 at 21:54

Monday, Jan 31, 2005 at 21:54
I have 305/70/16s on my GU TD42T, previously I had 285/75/16s as my touring tyres. (both sizes are 33") Well worth it for the extra clearance under diffs but with a slight loss of torque and increased fuel consumption. Engine braking and braking are also affected. The 315/75/16s really require increased braking ability (front slotted rotors) and new diff ratios (4.6s) as well as knocking a lot off of performance.
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AnswerID: 95934

Reply By: joc45 - Tuesday, Feb 01, 2005 at 19:57

Tuesday, Feb 01, 2005 at 19:57
Algee,
I'm happy with 265/75's. Got the Nissan sticker to cover change of tyre size.
I believe that if you fit the 285's, you will have to modify your wheel carrier on the back door to accomodate the bigger tyre.
As an aside, everyone reckons that the bigger tyres make the GU speedo read slow or occasionally spot-on. Mine is still 3km/h fast at 100km/h with the 265/75's, so if I had run with the original 265/70-series tyres, the speedo would have been hopelessly inaccurate (and the warranty would have run out sooner). Odo is now spot-on with the bigger tyres.
Had a hired current series 3.0TD for a week late last year, and found that the speedo in that was 4km/h slow at 100km/h (std tyres), as I found to my dismay as I went thru a radar trap.
Cheers, Gerry
AnswerID: 96127

Follow Up By: Member - Algee (NSW) - Wednesday, Feb 02, 2005 at 13:51

Wednesday, Feb 02, 2005 at 13:51
I cant find the trye sticker anywhere my local dealer doesnt know anything about it. CAn you tell me where to get one.
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