Member Since: 06 Aug 2011
Location: Edinburgh
Posts: 185
275 Section Tyres
Hi
Can any recomend a 275 setion tyre, that will have the same rolling radius as the std 255 tyre, that is all terrain rated?
KeithCheers
Keith
10th Aug 2011 9:10 pm
crews control
Member Since: 18 Mar 2007
Location: Dorset
Posts: 5011
19 or 20" wheels?
19" = 275/50 is close in diameter to standard 255/55
20" = 275/45 is close in diameter to standard 255/50
Ooops - sorry just seen what you mean...
I'll shut up now!
10th Aug 2011 10:42 pm
kljw
Member Since: 06 Aug 2011
Location: Edinburgh
Posts: 185
275 section tyres
Crews
thanks for the info, the wheels are 20" from RRS. 275x45 gives a radius that is 23mm less than std. i like the look of the wider tyres, but would prefer the rrr to be slighly bigger, than smaller i think.
i will keep looking, or maybe just accept the std wheels and tyres.
KeithCheers
Keith
11th Aug 2011 9:02 am
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15243
I reckon the tyre you want is the Coper Zeon LTZ in 275/45/20.
I'm currently running these on 20" Stormers on my D4 - no rubbing issues.
Been using this tyre for the last few years on my D3 in 285/50/20, but you get rubbing on the D4.
Fantastic trye for both on and off road with no noticeable road noise.
If you went down this route just double check you don't get rubbing on LR oem wheels, as I said, mine are stormers and are not oem.
btw, a reasonable difference in rolling radius imo is not really an issue [well experienced with the 285/50's]
You even get it with std tyres ie diff between a brand new and worn down....... always on the road less travelled 🚧
11th Aug 2011 9:50 am
crews control
Member Since: 18 Mar 2007
Location: Dorset
Posts: 5011
I've always been led to believe that you should try to stay within 2% of the standard tyre diameter? If the standard tyres are 255/50 then 275/45 is only -7mm smaller - less than 1%. If the originals are 255/55 then you're right - that's too much at -33mm.
11th Aug 2011 12:30 pm
kljw
Member Since: 06 Aug 2011
Location: Edinburgh
Posts: 185
Chaps
again, thank you for the comments. have done the maths as a comparison between the std 255x55 and the 275x45, the diference is 23.88mm smaller for the wider section. i may look to see if there is a 275x50 or 285x45, this would increase the rrr and may correct the lower speed reqading. did something similar on my SVX, put 305x60x18 Mick T's on, and all things read spot on, despite being told by land rover dealer tht the SVX would know that the wrong wheels are where on and it would not run propperly.........Cheers
Keith
12th Aug 2011 10:06 am
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15243
kljw wrote:
despite being told by land rover dealer tht the SVX would know that the wrong wheels are where on and it would not run propperly.........
It would only show up if you were running a different radius on the same axle.
Even at that, it would still run ok e.g. in light of a spare of different radius being used [though not recommended].
But in an Auto, it won't shift up beyond 4th gear [unless you use Command Shift to do so]....... always on the road less travelled 🚧
12th Aug 2011 10:50 am
crews control
Member Since: 18 Mar 2007
Location: Dorset
Posts: 5011
kljw wrote:
have done the maths as a comparison between the std 255x55 and the 275x45, the diference is 23.88mm smaller for the wider section.
Ahh... just realised you're talking radius and I'm talking diameter!
12th Aug 2011 3:18 pm
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15243
Just taken a pic for comparison between the 275/45 LTZ & 255/50 Pirelli
By calculation the Pirelli should be taller than the LTZ with sidewall heights of 123.75 versus 127.50 respectively.
So the Pirelli should sit around 7.5mm taller than the LTZ
BUT, as this picture shows, the LTZ is the taller tyre [sitting around 15mm taller].
OK the Pirelli has the weight of the D4 sitting on it, but even that won't compensate for the variation.
Oddly, I measuerd the diameter of both 20" rims and that comes out at 21.5" edge to edge.
OK, I know that's not where a wheel's measured, but it does throw a question mark around tyre/wheel measurements in general.
I'll do a more accurate measurement on the tyres when I've got the Pirellis off the D4 and sitting side by side with the LTZs.
edited to add: D4 is at off-road height btw, for purpose of pic.
Click image to enlarge
...... always on the road less travelled 🚧
Last edited by ronp on 12th Aug 2011 5:57 pm. Edited 1 time in total
12th Aug 2011 4:42 pm
Wildrover
Member Since: 19 Jul 2005
Location: Walkabout
Posts: 628
with all that discussion do you knowleable chaps think Cooper LTZ 275 /55/20 on non OEM stormers will rub??2007 D3 HSE Artic Frost Silverish
Wandering Aussie-Looking for SUN
Growing Old is Mandatory, Growing Up is Optional.
12th Aug 2011 5:03 pm
Wildrover
Member Since: 19 Jul 2005
Location: Walkabout
Posts: 628
Found this tyre calculator and given that on a previous post Lee mentioned his Coopers
285/50/20s rub on full lock
will the 275/55/20s rub on a 2006 Disco with an increased diameter of 17.5mm and a increased circumference of 54.98mm?
Is there more or less space in the wheel arch of a D3 vs D4?
Cheers
Matt2007 D3 HSE Artic Frost Silverish
Wandering Aussie-Looking for SUN
Growing Old is Mandatory, Growing Up is Optional.
12th Aug 2011 5:26 pm
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15243
Matt, real sure the 275/55's will rub and personally I'd forget that size.
Lee's Coopers were my previous set, they fitted my D3 fine with no rubbing, but they did rub on my D4.
Not as bad on Lees as his is the Com with different wheel arches, but the main point of rubbing is in the chassis extension that runs in front of the footwell area.
Chances are they'll also rub in post 07 D3's.
But by your icon you have an 06, so you've got best chance.
However, it's all down to the wheel offset that you have.
Others have fitted 285's to pre 07's, had rubbing and had to use spacers.
Best way is to do your calculations is with a 20" wheel & tyre already fitted.
Before the LTZ's [now on third set] I had Grabber 295/45's previously fitted and did the calculations around that.
Hope this helps.
edited to add: see pics of Simons and my Java D3 with 285 LTZ's fitted on this thread.
http://www.disco4.com/forum/topic67189.html...... always on the road less travelled 🚧
12th Aug 2011 5:49 pm
kljw
Member Since: 06 Aug 2011
Location: Edinburgh
Posts: 185
wheels
ronp
gret picture, and thankyu for taking the trouble. it is odd that the math shows one thing, and actual is something a little different.
just to clarify things, the 275 did not rub is that correct? also, i assume you where on a 20" rim, but was that a std landy rim, designed for a 255x50 or an aftermarket rim, designed for the 275 sect?Cheers
Keith
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just seen what you mean...
