Outer Limits 4x4 Board

Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

75

You're welcome

grimbo wrote:75

You're welcome

As per the Reflex ads...

"Never rely on Grimbo"

dark matter wrote:Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

Easy...

215 is the measurement accross the tyre (in mm)
R15 is the radius of the rim (in inches)
75 refers to the ratio of height vs width - in Percentage. therefore this tyre has a sidewall heigth of 215x0.75 = 161.25mm

The difference is - that the 215R15 must have a sidewall ratio measurement somewhere - but you just don't know what it is as yet - i.e. it could be a low profile tyre (215/25/R15) or it could be a tall profile tyre (215/85/R15).

Find out that ratio and you can work it all out - or, if you have the tyre in front of you - get a tape measure and measure from the rim to the tread and calculate an approximate ratio using that.

Cheers.

i always thought that if a tyre said 215R15 etc that it was assumed that the profile was 75 (the standard)

i may be wrong

The Great Gonzo wrote:i always thought that if a tyre said 215R15 etc that it was assumed that the profile was 75 (the standard)

i may be wrong

I'm happy with that - sounds good.

I was just thinking that perhaps dark matter hadn't received all the info about the tyre?

But a standard of 75 suites me fine

My answer was correct And you can rely on me to post a smart alec response:D

But yes it is to do with profile height and yes a standard R15 tyre is a 75 profile.

Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

dark matter wrote:Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

Glad to help out - though for future reference - if it has a number on it that is less than 31 (inches) - it's probably too small for what you want

greg wrote:

dark matter wrote:Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

Glad to help out - though for future reference - if it has a number on it that is less than 31 (inches) - it's probably too small for what you want

not everybody has a big block 0.66l motor like you greg to turn these enormous treads

greg wrote:

dark matter wrote:Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

Glad to help out - though for future reference - if it has a number on it that is less than 31 (inches) - it's probably too small for what you want

I wouldn't talk too loud, your tyres were looking a tad small last time I saw them.

greg wrote:

dark matter wrote:Thanx for the help, the tyre only had 215R15 on it, and thats what had me wondering.

Glad to help out - though for future reference - if it has a number on it that is less than 31 (inches) - it's probably too small for what you want

Can't find any trails in Adelaide worthy of 31's

bigsteve wrote:I wouldn't talk too loud, your tyres were looking a tad small last time I saw them.

Careful mate - remember you owe me first stint at putting some dents in that tub of yours

dark matter wrote:Can't find any trails in Adelaide worthy of 31's

Oh sorry mate - i meant 31's for when driving on the road - 34's are the minimum for trail work

As grumpo would say. "Do a seach"

http://www.outerlimits4x4.com/PHP_Modul ... unge+cheek

Dewse - start a build up thread for your car - clearly you are board.

greg wrote:

dark matter wrote:Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

Easy...

215 is the measurement accross the tyre (in mm)
R15 is the radius of the rim (in inches)
75 refers to the ratio of height vs width - in Percentage. therefore this tyre has a sidewall heigth of 215x0.75 = 161.25mm

The difference is - that the 215R15 must have a sidewall ratio measurement somewhere - but you just don't know what it is as yet - i.e. it could be a low profile tyre (215/25/R15) or it could be a tall profile tyre (215/85/R15).

Find out that ratio and you can work it all out - or, if you have the tyre in front of you - get a tape measure and measure from the rim to the tread and calculate an approximate ratio using that.

Cheers.

Bling bling 30 inch rims!!!!!!!

uphiir wrote:

greg wrote:

dark matter wrote:Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

Easy...

215 is the measurement accross the tyre (in mm)
R15 is the radius of the rim (in inches)
75 refers to the ratio of height vs width - in Percentage. therefore this tyre has a sidewall heigth of 215x0.75 = 161.25mm

The difference is - that the 215R15 must have a sidewall ratio measurement somewhere - but you just don't know what it is as yet - i.e. it could be a low profile tyre (215/25/R15) or it could be a tall profile tyre (215/85/R15).

Find out that ratio and you can work it all out - or, if you have the tyre in front of you - get a tape measure and measure from the rim to the tread and calculate an approximate ratio using that.

Cheers.

Bling bling 30 inch rims!!!!!!!

go build your THR smarty pants

as a side note why with metric tyre measurements like 215/75R15 is the rim size still measured in inches. You never hear of a 381 mm rim instead of a 15". Be much more bling when someone says have you checked ot my new 18" rims. 18s ha I've got 381s

greg wrote:

uphiir wrote:

greg wrote:

dark matter wrote:Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

Easy...

215 is the measurement accross the tyre (in mm)
R15 is the radius of the rim (in inches)
75 refers to the ratio of height vs width - in Percentage. therefore this tyre has a sidewall heigth of 215x0.75 = 161.25mm

The difference is - that the 215R15 must have a sidewall ratio measurement somewhere - but you just don't know what it is as yet - i.e. it could be a low profile tyre (215/25/R15) or it could be a tall profile tyre (215/85/R15).

Find out that ratio and you can work it all out - or, if you have the tyre in front of you - get a tape measure and measure from the rim to the tread and calculate an approximate ratio using that.

Cheers.

Bling bling 30 inch rims!!!!!!!

go build your THR smarty pants

OK back soon........

uphiir wrote:OK back soon........

again with the funny stuff

The Great Gonzo wrote:i always thought that if a tyre said 215R15 etc that it was assumed that the profile was 75 (the standard)

i may be wrong

I thought it was 78 not 75... anyway it's only old 7.50R16's and crap like that off dodgy old split rim Landcruisers who use em anyway.
What's the point of putting a 75 on if 75 = R anyway??
Whatever....

dark matter wrote:Can somebody help me out, what is the difference between a 215R15 tyre and a 215/75R15

Thanks for your help

The R is for radial, as in not a cross ply.

grimbo wrote:as a side note why with metric tyre measurements like 215/75R15 is the rim size still measured in inches. You never hear of a 381 mm rim instead of a 15". Be much more bling when someone says have you checked ot my new 18" rims. 18s ha I've got 381s

BMW have a 390mm and a 415mm rim

greg wrote:

dark matter wrote:Can't find any trails in Adelaide worthy of 31's

Oh sorry mate - i meant 31's for when driving on the road - 34's are the minimum for trail work

Doh!!

Suzuki Viagra wrote:

The Great Gonzo wrote:i always thought that if a tyre said 215R15 etc that it was assumed that the profile was 75 (the standard)

i may be wrong

I thought it was 78 not 75... anyway it's only old 7.50R16's and crap like that off dodgy old split rim Landcruisers who use em anyway.
What's the point of putting a 75 on if 75 = R anyway??
Whatever....

you should find 215R15 to be the same as 215/80R15