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Discussion Starter #1
Hi Guys,

I need some advice on selecting the biggest off-road Tyre that I can fit on my stock (with EAS) P38A with 18" wheels.

The tyre I am considering is the 275/65-R18 (Big Horn) from Maxxis. This is an off-road type tyre with an aggressive tread pattern.

The stock tyre is 255/55R18 which results in a 29" total diameter. The 275/65R18 results in a 32.1" Diameter. Apart from the offset in the Odometer (and the fuel consumption calculations), will I face any other issues with the ECU, ABS, TCS or the EAS systems ?

Regards,

Smokey
 

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1995-2002 Range Rover P38A
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smokey said:
Apart from the offset in the Odometer (and the fuel consumption calculations), will I face any other issues with the ECU, ABS, TCS or the EAS systems ?Smokey
Abit more effort in braking is required also braking distance will also need to be increaesed due to tyre size and traction
 

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Discussion Starter #4
Hi Tim,

I did take a look at the Tyres section, but I could not find any conclusive info. Maybe I was looking at the wrong threads. Would you be so kind as to post me a link to the relevant threads ?

I have also been told by some friends that it makes more sense to move to 16" wheels and to use a slightly over size (width) tyre to give you more protection if you end up rubbing rocks ! .. I checked with my local tyre dealer and he tells me that one of the most popular sizes on the 16" wheel is the 305/70R16. This is a 33" Tyre ! Anybody tried fitting this on a stock RR with EAS ?

Regards,

Smokey
 

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Hi Smokey,
And since nobody else said hello: welcome!

About the largest 16" tire you can run with a completely unmodified P38 is a 265/70. Your tire dealer was either thinking Defender (although I'm not even positive that a 305/70 would fit w/o rubbing) or he has 'all show no go' customers who just want the car to look cool in off-road mode and only drive in straight lines on flat surfaces. My Wrangler AT/R's are small for 265's (the exact size of a tire depends on model/manufacturer) and I have no rubbing: others have mild rubbing at full articulation/lock with this size.



There a numerous threads here on the board and the tire page on the main site is http://www.rangerovers.net/outfitting/t ... tires.html (you didn't look very hard... :roll: )
 

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Discussion Starter #7
Hi Stevemfr,

Thank you for that update (and the welcome :) !)

I have a friend here in Bangalore, India who has fitted Yokohama Geolander ATS tyres of size 265/65R18 on his Range Rover (sans EAS, he has fitted Coil springs). This is a 31.5" Diameter as compared to a 30.6" Diameter with the 265/70R16. I don't know if it is because of the fixed coil springs, but he has no problem with the tyre size.

Another friend in our group runs 305/70R16 on his Land Cruiser. I plan to try out his wheel & tyre (hoping the fixing holes are the same PCD) on my Range Rover before I go out and buy myself a full set of wheels & Tyres. I may have to re-program my EAS to increase the height in Access Mode. Will keep you posted.

BTW, your Range Rover looks beautiful !

Regards,

Smokey
 

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Smokey and the Rangie.

As per my '88 Highline it's typical for Land Rover to have strange fitment requirements when electing more off-road rubber !

Your typical tire height on the standard P38's of 29 inches is the same as previous Range Rover Classics and I've now been running Dick Cepek FC-2's on Performance 15x7 inch wide rims in Australia with great success as this truck is tyre sensitive.

An earlier scribes suggestion of selecting the smaller SE spec' 16 inch rims would be the best and least expensive path to an all round on/off road package, as this offers the benefit of having one set oriented for play and your 18's for highway use.

The preferred maximum requirement whilst fitting within the guards is a 31x10.50R16 fitting or metric 265/70R16 tire size ?
Interco tire offer the excellent TRXUS MT in this format & is what I would rate superior to the Maxxis Bighorn's I have tried.

Two other options in 16 inch are the beautiful Parnelli Jones Dirt Grip or Pro-Comp Xtreme Mud Terrain's - though expensive.

A major concern if you get a puncture is matching your spare to the other three, otherwise you'll get a broken transfer case.

Cheerio,


Vince.
'88 Highline
Perth, W.A.
 

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Discussion Starter #10
Guys,

The tyre I have selected in the Maxxis Mudzilla ! .. measuring 31x11.5R16. This tyre just about fits my stock P38 with the EAS in the Access mode. There is a little (about 3 mm) of tyre rubbing the front mudflap when the steering is turned full. The mudflaps are going to be off when I go off road anyway.

The tyre has a very aggressive tread pattern (see photo attached) and I believe it is well suited for Mud and Trail. I plan to take my P38 with Mudzilla for the next 4x4 event close to where I live. Check out the link to see the event that took place at the same place last year.

http://www.team-bhp.com/forum/4x4-excur ... 008-a.html

Will post some photos of my RR with the Mudzillas soon !

Smokey
 

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Hey Smokey I currently have Toyo proxes 285 60R/18 (came with the truck when I bought it) and there is a little rubbing. The truck also sits on the tires when the EAS is completely deflated (haven't gotten to putting in thicker bump stops yet).
Pics : http://www.cardomain.com/ride/2934773
 

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Smokey Dokey.

Very good selection of a 31x11.5R16 Maxxis as I've heard positive news of this tyre pattern and performance on Landcruisers.

Apparently they are an equivalent to the Goodyear MT/R's in terms of bullet-proof reliability, just they don't like tarseal at all.

Be careful with the width of the rubber, as mentioned the maximum should be 265(10.5") across, otherwise as aflicts all the Land Rover product if you are at the maximum droop or compression and are turning the wheel these can rip off the fenders !

The tyres weigh nearly 25kg's each which is very heavy and as I suggested your shocks will need beefing up to cope with this. Best to contact Rick from www.doetsch-shocks.com and request a set of Pre-runner 8000's which are ideal for slow going, as from the link and photos at your off-road adventure playground seems to me tough on the truck so run 25 psi tyre pressures ?

Cheerio,

Vinniman.
'88 Highline
Perth, W.A.
 

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Maxxis are a good tyre for the price. I'm running 33" 285/60 Maxxis Bighorns on 16" rims for off-road play and they are pretty comfortable on road too, albeit a bit noisier than the 30.5" 265/60 Cooper H/T Plus' on 18" rims that I bought for on-road use.

I'm thinking of changing over to BFG M/T KM2's next time I need change over the off-road tyres. They have been getting a very good review by the local 4WD magazines here in Oz.

Cheers, Paul.
 

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G'Day Paul with the P38A.

Touch base with Ryan at www.fourbys.com.au in Brisbane, Qld as they are evaluating the Dick Cepek Mud Country and Crusher tyre patterns from www.dickcepek.com - which I would rate much better than the BFG KM2's in their new 265/75R16 fitment ?

If you're running a factory 16"x8" wide wheel on your beast in high mode, then I think their actual height of 32" is O.K. dude.

I'm really impressed with my 31x10.5R15 All-Terrain Fun Country's on my Classic which are the perfect pattern touring W.A. !

Cheerio,


Vinniman
'88 Highline
Perth, W.A.
 

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I run 275/65/18 Cooper Discoverer ATR's and it didnt rub that much at all. I recently recalibrated the eas to allow a little more clearance. they are big.
 

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Discussion Starter #17
Gentlemen ...

I have the Mudzilla 31x11.5x16 fitted on my stock P38A and they work like a charm !! Just did some 4x4 today ... I have posted some photos here.

Smokey
 

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