4Runner Rim Sizes

Submitted: Wednesday, May 18, 2005 at 23:32
ThreadID: 23112 Views:4072 Replies:4 FollowUps:0
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Hi Guys,

My head is going bonkers at the moment. I currently have 31x10.5xR15 on the 4wd. Now I decided for a change to actually look on the tyre plaquer and see what the recommended tyre sizes are on that vehicle. Found out that the correct size is actually 16xJ6 and 205s.

Now my question for you is what size is 205s when it comes to 28,31,33s etc?? and what is the J6 all about? Like I said above I currently have the 31s on and Im looking at going up to 33x12.5xR15 for the mud terrain tyres. With this change will there be much of a difference considering that the car is Recommened to have 16" rims??

As far as I know right now my speedo could already be currently out and if i were to go up to the 33s on 15" rims I would assume that this should then correct the speedo, gearing and even improve the fuel consumption, I could also be incorrect.

If anyone can help me out it will be greatly appreciated.

Thanks All,
Shaun
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Reply By: Andy C - Thursday, May 19, 2005 at 00:17

Thursday, May 19, 2005 at 00:17
There's a great article on "fitting bigger rubber" in Aust 4WD Monthly (No 62). It gives you all the numbers to crunch re the bigger tyres. And stay with the 15" rims.

As far as J6 and j7 etc (width), the important thing is to make sure if you're going up a rim size (eg. 6" to 7") to fit a bigger tyre, the new rim has an adequate offset for the vehicle and the new tyre doesn't damage anything on full lock and/or full compression.

But to answer one of your questions - a "205/70/R15" means a "tread width of 205mm/a side wall height of 70% of the tread width/on a 15 inch rim"! Now that doesn't mention the required rim width though!

Fuel consumption - your theory is right but in practice you may burn more just getting up to speed.... I'm working on that at the moment - will let you know how I go with the current tank after fittin some 32"

And have a chat to your local tyre dealer about rim sizes (doesn't cost a cent to chat) and what will fit and can fit yours.

If you think your speedo is out, borrow someone's GPS and go for a run on the freeway to see what the error is. And remember it!

Good luck!
AnswerID: 111881

Reply By: Andy C - Thursday, May 19, 2005 at 00:46

Thursday, May 19, 2005 at 00:46
Sorry to go on

But why I'm saying I'm running 32", I'm actually on a 265/75/R16.

So the width is 265mm = 10.5"

So the side wall is 75% of the tread width - 199mm = 8.1"

So the side wall x 2 = 16.2"

Plus the rim size of 16"

Equals 32" There you go - easy as pi!

And in mentioning "offset" above, is to make sure the "wheel track" (ie the centre line of your current wheels in total don't go out further than the max allowed (25mm in WA) apparently!
AnswerID: 111882

Reply By: Jim-Bob - Thursday, May 19, 2005 at 09:00

Thursday, May 19, 2005 at 09:00
G'day Shaun17

I had the chrome rims on my 4runner which were 16xJ6 and had 205/75-16 tyres.
These tyres are only 28.1 inches in diameter.
Try these web sites, one is to calculate tyre size and the other is BF Goodrich AT,s web site.
http:www.miata.net/garage/tirecalc.html
http:www.bfgoodrichtires.com/assets/pdf/all_terrain_ta_kd.pdf

The last trip I did to the gulf I used 235/85-16 and I was towing my CT but it was geared too high for low range 1st gear crawling.
Hope this helps.

Safe travells
Jim-Bob
AnswerID: 111899

Reply By: Longy - Thursday, May 19, 2005 at 17:48

Thursday, May 19, 2005 at 17:48
G'day mate,
I got the RV6 4runner myself and it's got the alloys that come with the sr5 models. 15x7inch. Currently running a set of 32x11.5R15 MTR's as this is the biggest I could go without needing new rims. The 33's require you to get 15x8inch rims. Didn't want new rims and plus the speedo is accurate now right on the line. Fuel consumption is the same I'd assume, depends more how you drive though. Plus I just put a new reconditioned engine in my 4runner so I'm getting about 430kms before I need to fill up and the light comes on.

So all in all it depends on what you need and the size requirement will be determined by the type of driving etc...

cheers,
AnswerID: 111950

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