How to decipher the numbers on the tyre tread

[Woof]

Hey Richard, just ask any question you like mate, nothing to be ashamed of here...........we are all here to learn and pass on our knowledge.
Me, I know absolutely nothing about anything but I am learning slowly...haha

[richardharris51]

Thanks to all who got involved this was really helpful

Hopefully see you out there soon driving or fishing

[Robo]

[QUOTE=richardharris51;241711]Hello folks,

I was hoping for some clarification on the numbers on the tyres I have fitted to newly bought GQ td42 diesel.
Right so on the tyre it says:
31x10.5 r15
This is what I think it means;
31 inch tyre
R is for the rim size being 15 inches
BUT what is themiddle number 10.5 all about??
If I am right about the 31 and r15 part my next question is, if I was to buy 33inch tyres would they fit on the same rims I have now or would I have to upgrade them too??

If you have a squizz around at tyre manufactures web sites you can pick up a whole lot of useful info.
EG- list of sizes, rolling diameters, load ratings, amount of ply's use. see attached pic's.
hope this helps.
these are examples of a particular brand for given tyres they have in their range
cheers

[growler2058]

10.5 is width in inches
31 is the overall tyre height in inches
35 will fit on a 15 inch rim
Mine are 33"x12.5"x15


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[roon]

ur rim size is 15 and u can install low profile tyres and huge profile tyres of 15 size which u like

[roon]

u can also install up to 22 size rims with lowprofile tyres