D40 Tyre Size - Nissan-Navara.net
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post #1 of 56 (permalink) Old 22-08-07, 08:40 PM Thread Starter
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D40 Tyre Size

YES i know i know this has been talked about many many many times but please please can someone tell me once and for all whats the max size tyre i can fit on my standard d40 adventura? i,m getting new ones hopefully before i go away on sat. I really fancy the BFG AT,s but what size or do i stick to standard? i,ve done 28,000 miles and the fronts are totally stripping away at the sides but the back are fine? whats disadvantages of the BFG,S????
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post #2 of 56 (permalink) Old 23-08-07, 11:15 AM
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BF Goodrich don't make tyres the same size as the standard OEM ones.

The nearest they have is 265/70 r17 which is slightly wider and slightly taller. However, they fit the standard car without problems although they are closer to the front spolier trim. (25mm clearance).

The standard speedo on the Navara (and most cars actually) under-reads by about 5%. With the BFG's, the speedo is much closer to accurate but is still slightly lower than actual. (between 1 and 2%). I've checked it with GPS.

I've had 50,000miles out of a set of BFG's on a previous car. They are good on road and excellent off road...

Mine were about 540 fitted, iv VAT and balance etc.

Cheers,

Dunc

Had an 06 Silver D40 Outlaw....
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post #3 of 56 (permalink) Old 23-08-07, 11:52 AM
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Ive had my BFGs on for over a year now, Fantasic Tyres

Lasting far longer than the Tyres on our vans

D40 Adventurer, Sat Nav, Leather + Heated, Auto Lights, Auto Climate Control, Auto Wipers, Auto Box. Cruise Control, BF Goodrich AT, Rear Winch, Front A Bar, 4X 140 watts S/S driving lights, Forward facing gate opener.
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post #4 of 56 (permalink) Old 23-08-07, 12:27 PM
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I have been researching tyres and wheels for some time now, to ensure any upgrade I make is correct for safety and stability etc........ and to ensure I don't fall foul of the Nissan warranty.

Anyway, it has led me to this conclusion. 265/70R17 anything is,........ wrong!

In fitting non standard tyres or alloys to any car, you are advised to stay within 2% - 2.5% of the circumference of the standard tyre/alloy combo fitted.

In fitting 265/70 R17 BFG A/T's or similar, you are fitting a "way over" size - at over 5% difference.

255/65 R17 763 mm 2397 mm = 0 %
265/70 R17 803 mm 2523 mm = +5.17 %

Surely, a 275/60R17 is the right fit

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post #5 of 56 (permalink) Old 23-08-07, 12:28 PM
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Spoke to Mark Harvey at Formula4

He now stocks the 255/65 R 17 Yokohama Geolandar GO12 A/T-S 110H RBL

http://www.formula4.co.uk/products/Prod ... erProduct=

A perfect straight swap for the Goodyears, if you want an ALL TERRAIN tyre, and NO ISSUES with wrongly sized tyres on your pride and joy!

DISCOUNTS AVAILABLE

10% on all items marked E to P in their catalogue
7.5% on all wheels and all tyres.

Currently FREE shipping across Mainland UK too. (you'll have to get a local fitter to fit, but many of them do it)

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post #6 of 56 (permalink) Old 23-08-07, 12:32 PM
pj
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I have done 16000miles in about 5 months travelling up and down the country, mainly motorway miles . I am curious if the bfg's have better grip on tarmac or noisier than the original hoops.
Paul

Paul
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post #7 of 56 (permalink) Old 23-08-07, 12:33 PM
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There's a lot of discussion as to the correct tyre size fitments if changing from Nissan standard size which is 255/65/R17T

Any decent website, tyre fitter, adviser, will recommend no more than a +/- 2% difference in the rolling circumference of the replacement tyre.

The rolling circumference is the distance covered in mm by one revolution of a tyre, so in theory, any smaller or larger circumference difference will affect speedo readings, mileage covered etc.
There's also the possible Nissan warranty refusal to consider ..... "Sorry sir, but you've caused the problem to your ??????? as they aren't standard tyre sizes, we believe that has caused the problem and you aren't now covered!"

Check this link http://www.rochfordtyres.co.uk/tyrecalc.asp

It is a very efficient and easy way to check how to upgrade any tyre / alloy combination from 16" up to 24" and you can ensure that any changes you make are SAFE, STABLE, and WITHIN WARRANTY!

For quick reference, the BFG A/T 265/70 R17's that are being suggested as a perfect fit, are +5.17% too big.

The 275/60 R17's are within 0.2% of the correct circumference.

As they say, you do the maths, oh and ........RTFM!

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post #8 of 56 (permalink) Old 23-08-07, 09:20 PM
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A few weeks ago when I was researching tyres I had the following options:

265/75/17s (either BFG's, Grabber AT2's, Toyo open county and a couple of others)
255/65/17's (Original Wranglers, Colway remoulds in AT or MT, or the Geolanders as mentioned above)
245/70/17's (Most patterns by cooper, ST's, STT,s and a couple of road biased patterns too)

I was trying to push the company into the Geolanders (as they were the OEM size) but as it was all done at the last minute we ended up fitting 5 BFG's. Cost was 558 for FIVE, fitted and balanced. I have just noticed that Formula4 have the Geolanders at 151 EACH!! Thats 755 for a set of 5!!! Yeah right!

I knew full well about the 5% difference in circumference and indeed have posted about this in the past.

I have been using them now for several weeks and have found them to be brilliant. There has been no rubbing of wheel arches etc, although at extreme positions this would be possible. Lets face it though, not that likely to be on an extreme cross axle situation in a pick up, thats not what they are designed for. When we bought them I asked the dealer for advice, and they suggested that size, they had quite a few in specifically for sales to Navara/Pathfinder drivers. If anything goes wrong they will get it in the neck!

There is no extra road noise, no loss of grip on the tarmac (wet or dry) and a very noticeable improvement when off road. I have been driving through wet fields this last week, through mud/**** left where cattle feed and pulled through better than when I had the wranglers on.

The speedo is more accurate now as the gearing, will inevitably be slightly different, although not noticeable.

BFG's have a good reputation for high mileage potential, not sure of the Geolanders reputation.

Regarding warranty, my clutch is about to get changed, they looked at it a couple of weeks ago, ordered in the parts as a warranty claim. They saw the tyres, in fact I told the workshop manager that I had them on. When I have asked Nissan Dealers about alernative tyre sizes they dont know (or not interested) so I doubt if they could moan that the tyre size was wrong when they cant say what was right!!

I was going to try the Colway remoulds. I had arranged a heavy discount on them (5 at cost price) for a running review of them but as mentioned as it was a last minute thing to get tyres (9am monday before a drive to Durness and had 3 barely legal tyres at the time). They may be worth a try as they are made to the same spec as a new tyre now, lot more regulation in remoulds now.

Steve

Was: Silver D40 Aventura (06 plate), BFG's, reversing sensors, Snugtop XTR.
Now: Skoda Octavia vRS TDi (170bhp) Hatch,07 plate
And: Land Rover Freelander TD4 commercial.
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post #9 of 56 (permalink) Old 23-08-07, 10:12 PM
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Good reply Steve,


Yamred - BFG AT's are the best and most versitile tyre I know of, 265/70/17 is a big as you would want to go at standard spec, most fiters will advise this size if looking for AT type tyre. This has been said countless times before.

Chunk - I really dont see the problem with bigger tyres nearly everyone I know with a large 4X4 has upped the size of their tyres, none have had problems because of this.

Thanks, Thomas.
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post #10 of 56 (permalink) Old 23-08-07, 10:51 PM
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Just as an addition to my post above....

For the work that my jeep is doing the BFG's at that size are fine, not really that much chance of rubbing as its not gonna go rock crawling to any extreme.

I visit radio station (mobile phone masts) sites up and down scotland. These tend to have steep, rocky, muddy and rutted tracks to them of varying degrees. Many are OK to get a Transit van up at speed (and lots of wheel spin) but some need a slow, steady approach in low range. The added grip of AT's and knowledge that there is less chance of tyre damage to an AT than a road tyre helps. If the track was boggy or too deeply rutted we use an ATV, and even they get stuck.

Anyone upgrading there tyres have a think on what use you are going to put them too, remembering the limitations of a pick up with long over-hangs etc.

If, like me its just tracks/fields/odd bit of mud/steep inclines then BFG's would be fine. I drove up a track last week (just for the sake of it, could of gone over a tarmac road but that meant opening a gate) that was quite deeply rutted (maybe 9") and made up of rocks with sharp edges all over. Was quite an incline too, maybe 35 degrees. Went up in 2wd with no problem with the tyres hitting the arches etc.

If, you are likely to be using the truck in a situation of extreme cross axles and the bigger tyres would be a hinderance, then maybe opt for the same size Geolanders (or coopers would be my choice).

But, if you want the best tyre and grip and promise of long life etc and will put the truck to good use off road then get the BFG's with a suspension lift like Dunc has.

One thing to remember is AT's (and I suspect MT's too) will retain quite a lot of stones. So when pulling off the track onto tarmac it sounds like someone is shooting at the truck with an air pistol as they all spin off!!

I have also read in a mag that cooper are offering a 30 day money back guarantee on their tyres. The appropriate cooper size would be 245/70/17 which is almost the same circumferance as the OEM tyres. There is a school of thought that says for every width step you change, change the profile the opposite way. So 255/65 becomes 245/70 etc. Never go more than 1 width size bigger or smaller on original rims without seeking advice.

Steve

Was: Silver D40 Aventura (06 plate), BFG's, reversing sensors, Snugtop XTR.
Now: Skoda Octavia vRS TDi (170bhp) Hatch,07 plate
And: Land Rover Freelander TD4 commercial.
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