Hi

I have been seeking a new front pair of 255/50/20 tyres, but in doing my homework and research it would seem that I can get a MUCH better deal on a set of 255/55/20's. (I drive a 2012 4.4TDV8 Westminster).

I understand that if I go for the slightly larger tyre there will be a small % variation in the speedo reading and, I assume, the mpg calculations etc. in the computer. What I am keen to understand more about is if it is safe and operationally sound to fit the slightly larger tyres? (If I go down this route I will swap all 4 tyres).

I guess also that the additional 5mm would add a little extra to the ride comfort?

I'd appreciate your comments.

Thanks. 2017 4.4 SDV8 Autobiography

I've done it and it's all good.

I marginally prefer the look of a 50 series profile Pirelli but I much prefer the ride of a 55 series Michelin.

Incidentally I have a road angel and the GPS speed is almost exactly the same as the speedo displayed speed now whereas the speedo was historically 2/3 mph optimistic versus the road angel on 50 series tyres.

Hope that helps 2016 (L405) Autobiography in Black with Ivory - for ULEZ
2014 (L405) VSE in Black with Ivory
2011 (L322) VSE in Black with Ivory
2005 (3.2 V6) Porsche Cayenne in Black with Savanna
1999 (P38) VSE in Burgundy (?) with Sand

That's very helpful, thanks. Now I just have to find a good deal on a set of Scorpion Verde's......! 2017 4.4 SDV8 Autobiography

Have the 55s in my 2007 and all.good, as previous poster stated, no real diff in speedo . 2015 4.4 AB
GSXR 1000 K5
R1 1998

I've recently fitted 405 style 502 with 255/55R20s, no problems, immediately after fitting I did notice that the car was slightly higher, but this now feels normal. The steering is slightly slower than with the 255/50R20s, but that suits me as I am used to 19" wheels and 55 sidewalls in the winter and on my previous car. Only Range Rovers since 1988

Thanks to all for the comments.

I've just picked up a full set of Scorpion Verde's in 255/55/20 so looking forward to having them fitted next week. 2017 4.4 SDV8 Autobiography

I've recently done the same thing, gone from 50 to 55 profile on 20's. I fitted grabber A/T3's and love them. Current: TDV8 (3.6) RRS HSE



Past: TDV8(4.4) Vogue
Discovery 3 Commercial
TDV8(3.6) Vogue
TD6 Vogue
D2 V8 ES
D1 V8 ES
RR Vogue Classic

No intrusive noise from the AT3s I presume? I'm keeping a look out for quieter and possibly slightly smaller tyres than my current 275/55R20 BFG KO2 although AT3 in 255/55R20 isn't currently available here .

The A/T3's are fantastic! I have always had grabbers fitted on my cars and used all the various incarnations. The 3's are very quiet and handle superbly. They have various improvements over the 2's too!

They are a superb all round tyre, that will last for huge millages.

https://www.generaltire-tyres.com/car/tyre...rabber-at3 Current: TDV8 (3.6) RRS HSE



Past: TDV8(4.4) Vogue
Discovery 3 Commercial
TDV8(3.6) Vogue
TD6 Vogue
D2 V8 ES
D1 V8 ES
RR Vogue Classic

Thanks for the feed-back. I note that the AT3 in 275/55R20 has a load index of 117 so might have stronger sidewalls than 255/55R20 although not necessarily so. Neither size is available here yet but my current tyres are only half worn so plenty of time for availability to change.

Just changed my Scorpions from the 50 to the 55 Verdes and they look a lot larger/fuller and the ride is even better than when I had the car on 19s. I checked the speedo against my phones sat nav and it is bang on.

Recommend it if you have pot holes in the area (whole of UK)..... Tom

Current Drive
2011 4.4 TDV8 Autobiography - Santorini Black - Ivory Leather

Previous Drives
2004 Model Vogue Td6 (Touchscreen) - Java Black - Parchment Leather
1994 RR Classic 3.9 V8 Soft dash - Niagara Grey - Grey Leather
1972 Series III SWB Safari - Green (Hand Painted) - Black Plastic

Can you have a 255/50/20 on the same axle as a 255/55/20 ?
Can you have one size front and one size rear ?

no to all your questions... ... - .- -.




Y. O. L. O.
.

The diffs wouldn't last very long with different size tyres on the same axle 2015 4.4 AB
GSXR 1000 K5
R1 1998

DSC would go crazy too.