Member Since: 13 Apr 2010
Location: Houston, Texas, United States
If you have too great a difference in rolling radius [esp on front] the D3 detects this and puts it in safe mode.
ie in auto, it'll only change up to 4th - command shift needed to move to 5th & 6th.
I experienced this when I had a puncture and put on my just legal spare.
Cann't say what would happen on a manual though!
This happened to me last week. I bought a used LR3 and did not realize it had 3 Michelin tires and 1 Goodyear tire. The Goodyear tire was on the rear passenger side.
I had the tires rotated and the Goodyear was moved to the front passenger side. After the tire rotation, the LR3 would not shift past 4th gear automatically, although I could shift to 5th and 6th using command shift.
I had the Goodyear tire moved back to the rear, and now it will shift to 5th and 6th automatically again. The tires were the same size and appeared to have the same tread depth, but obiously there was a difference in the rolling radius.
That brings up the question, is the difference in rolling radius only detected if the front tires are different?
Personally, after seeing how sensitive the vehicle is, I'll feel better once I have all four tires replaced, not just the rear tires.
22nd Apr 2010 5:08 pm
Member Since: 17 Dec 2009
I popped into Costco at Leeds to ask about this. They said that they'll only change all 4 at the same time....to do with winding the diff up. I asked if they would change 2 if the manufacturer said it was OK and the bloke said no....they apparently stick to their policy on this. The only exception is if the 2 that don't need changing are the same make size, depth etc.............sound like a con to me...
i change all 4, winter down to 4mm, summer 3mm. dont like the idea off hitting water on the motorway with different tread depths with a car full of (mostly) loved ones representing my entire lifes investment just to save a few bucks.There's one wheel on my wagon, but i'm still rollin' along, it's the cherokee, they're after me, but I'm singing a happy song
1st May 2010 10:39 pm
Member Since: 02 Jan 2019
I have a 2006 disco 3 auto TDV6.
Car had worn off road tyres on the day of purchase so that’s fine as they looked ok.
Mot came and I got a warning on one of them being worn/on the edge (rear tyre) - so got a matching pair that matched the front.
The handling was shocking! Felt like death drive and scared me to death! Hard to describe but awful.
Had front track rods sorted as they had bust, old front wheels balanced and a full tracking done!
BETTER but still not right as it does still have a wiered pull but it is better!
Anyway, 5 weeks after replacing the back ones I’m replacing the front ones (tomorrow) and if it’s still crap I’m going to get the steering rack looked at.
Question, new rear tyres have been on my disco for 5 weeks and I have the new pair ready to go on the front tomorrow morning.
Will they be ok on the front?
They are Insa Ranger 255/55/18
7th Jan 2019 8:10 pm
Moo D3 Decade
Member Since: 13 Aug 2010
I never skimp on tyres. They are the bit in contact with the road in a 3.5 tonne brick.
I change all four at four mm (AT tyres) and buy good quality always. Currently have Durtracs on.D4 HSE (Known as Gerty) Mods in progress
No longer the Old Buses original owner
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
T-Max split charge
Hanibal Expeedition rack
BAS FBH control
7th Jan 2019 8:21 pm
Member Since: 02 Jan 2019
Thanks, I should have just done the full set but didn’t and 5 weeks on I’m like
So tomorrow it’s another matching new pair so I’m hopeful for better steering! I think the front ones after being unbalanced and 55% worn that they need to go!
Love my disco but want to get the feeling of control back!
7th Jan 2019 8:26 pm
Member Since: 30 Oct 2011
would they fit one tyre is you went in with a right off puncture
8th Jan 2019 1:32 am
Member Since: 24 Aug 2007
I think there is a few things to look at here.
Big 4x4 are heavey and need good tyres all round to help make them stay on the road. We recently went out to a Q7 that had crashed, on tyre was bald and was a major contributory factor to the accidnet, damp wet roads etc
We all treasure who or what we carry in our cars and as such want to maintain safety
Common sense, if all 4 tyres are down to say 2mm you would be made not to change all 4. However if all tyres had 8 mm of tread and you got a puncture that was not repairable you would alos be mad to chabge all 4 as long as you were sticking to the same make/tyreMY17 D5 1st Edition Namib Orange
MY15 D4 HSE Kaikoura Stone
MY12 D4 HSE Nara Bronze Sold and gone
MY11 D4 HSE Stornaway Grey Sold and gone
D3 S spec Silver Sold and gone
Tow bar, full length roof bars, side steps, tow bar storage unit, surround camers.
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8th Jan 2019 8:36 am
Member Since: 15 Apr 2015
For instance consider the following:
A vehicle fitted with 265/70R16 (Nissan Patrol size)
A new tyre will, according to the industry standard dimensions (ETRTO) have an overall diameter (O/D) of 792mm.
Average tread depth when new will be around 10mm.
A tyre with 5mm remaining tread depth will have an overall diameter of 782mm (original O/D - [2x5mm]).
To obtain the theoretical rolling circumference of the tyre you multiply the O/D by 3.05.
New tyre rolling circumference
792 (original O/D) x 3.05 = 2416mm
Tyre with 5mm remaining tread depth
782 (O/D worn tyre) x 3.05 = 2385mm
Difference of 31mm
This means that the new tyre will have 31mm further to travel for every revolution of the wheel.
A tyre of this size will rotate approximately 413 times per km, therefore for every km driven the new tyre will travel an extra 12830mm or approx 13 metres!!!!
Tyre manufacturers and retailers have differing views about the maximum allowable difference in tread depths between new and worn tyres fitted to a vehicle but in general most recommend a difference of no more than 3 - 4 mm. All manufacturers will recommend fitting at least matched axle sets.
This is patently nonsense as they are all part of the same wheel. I'm with Calvin on this.
Click image to enlarge
Now. Back to the Flat Earth Society's website for some informed debate.2014 - D4 2010 HSE Nara Bronze
2012 - FL2 2009 GS Stornoway Grey
2001 - VW Passat Estate Inky Blue
1999 - Ford Mondeo Light Blue
1998 - Rover 25 Red
8th Jan 2019 9:47 am
Member Since: 13 Jun 2016
Just to add Costco also insisted All 4 tyres would need to be replaced on a Honda CRV, even though it was only the front pair worn. Honda confirmed to me that there was no requirement for all 4 to be changed. Needless to say I don’t shop for tyres at Costco.
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