Which Size Tyres

[MichaelSB]

My 4L convertible is on 225/60 ZR 16 P4000 and I am thinking of changing to 225/55 ZR 16

Has anyone else done this and did it impact on ride quality or speedo reading

[ptjs1]

Michael,

Arguably a better handling tyre at slight expense of ride quality. In my experience the P6000 225/55 has worn faster than the P4000 225/60, but with the sort of mileage you'll do, that's not exactly a problem.

It will make your speedo slightly over-read from it's current reading. But there's little you can do about it. All the speedo componnets are the same on late Touring-suspension cars (4-litre convertibles) as they are on Sport-suspension cars (4 litres coupes + 6 litre cars). See my post here:

http://www.jec-xjs-forum.org.uk/xjsbb2/ ... .php?t=682

I would just change them unless you like the current setup.

Paul

[MichaelSB]

Thanks for the info.

You may find this site helpful it calculates the change to speedo reading on tyre size

http://www.kouki.co.uk/utilities/visual ... calculator