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I was actually looking into something similar for getting winter or all-season tyres for new car (still waiting for delivery), especially with temperatures now freezing.When I ordered my D300 HSE, I specified 20 inch wheels. I noted that summer tyres would be fitted. I informed the sales rep that I would be replacing the summer with all seasons tyres. The rep said he would arrange to have the new tyres fitted for the hand over.
When I was notified my new car was on it's way, I asked the dealer to confirm the tyre size. He told me 255/55R20. So I purchased a set of tyres and they were fitted by the dealer on the day I collected the new car.
My question is this. I got a message from the TPMS the other day that one of the tyres was a little soft. So I stopped at a local garage to use the air pump. When I checked the required pressure on the info plate, the 20 inch wheels were listed as 255/50R20.
So is there any potential risk from having 255/55R20 tyres fitted instead of 255/50R20 tyres?
I've not noticed any instability or problems with braking or cornering. The fuel consumption calculated by the trip meter is almost the same as a brim to brim calculation after filling with diesel.
I'd appreciate any insight on my situation.
Thanks.
George D.
The official supported tyres are listed in the User Guide here
Jaguar Owner Information
www.ownerinfo.jaguar.com
Jaguar Owner Information
www.ownerinfo.jaguar.com
It includes several 255/50R20 and 255/55R19 options, but does not include any 255/55R20 options.
So according to that document, your tyres would not be supported, because the aspect ratio is not correct for 20-inch rims (55% instead of 50%), so the sidewall would be slightly too large (140mm vs 127mm).
Other forum members may know what the practical impact might be, but I would assume some degradation of stability or handling, as well as speed and distance instruments reading artificially low (due to circumference being slightly too large).
Interesting you haven’t noticed any issues, but maybe only apparent in really controlled environment or in more extreme/emergency situations?
Or maybe 55R20 tyres would be perfectly safe and acceptable, but it is simply not a tested / approved combination by JLR.
Also, perhaps insurance cover might be invalid or disputed by the insurer in the event an accident?
Definitely interested in more knowledgable replies from others…