How to decipher the numbers on the tyre tread

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

Thanks to all who got involved this was really helpful

Hopefully see you out there soon driving or fishing

[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

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

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