Hi guys, Quick question....If i get a puncture and my spare has a slightly different rolling radius to the three good wheels..how much of a problem could this be? How much difference can i get away with?
Im confused...how does the width of a tyre affect its rolling radius?
I know that but if you type in a different width ie 255 change to 205 it gives you a different rolling radius.
Legally 0Cm, tyres have to be the same across the axle, though where that leaves space saver spares with respect to the construction and use regs I don't know except they are restricted to about 50mph. You problem would be with insurance in the event of an accident
Well thats as clear as mud....lol. i only wanted to know if it would damage my car to run one wheel with a slightly different rolling radius in the event of a pucture. lol
FFS it's int difficult a tyre is sized in the following way. the width/ the height of the tyre wall/the rim diameter. (or the size of the hole in the middle.
SO!! a tyre of size 235/75/16 is 235mm wide has a wall height of 75% (3/4) of the width. In this case 235mm and a rim size of 16". which gives a total diameter of 235/100 * 75 =(176.25mm)*2 (top and bottom) = 352.5mm (13.87")+ 16" = 29.87"
whereas a tyre of size 285/75/16 = 285/100 *75 =213.75mm * 2=427.5mm (16.83") + 16"= 32.83"
A difference in the rolling diameter of 2.96" or almost 3"
and a Tyre of 235/50/16 using the above formulae has a diameter of 25.25"
im not interested in the mathmatics..only if itll damage my car!!!!!