Sorry i'm crap at this....

[dullbird]

is there much difference between a 205/80/16 and a 245/75/16 ???

[up2nogood]

http://www.bfgoodrich.com.au/config/downloads/MudTerrainTA_KM2_DimensionData.pdf


or


OnlineConversion.com - Tire Size Conversion (http://www.onlineconversion.com/tire_size_conversion.htm)

[dullbird]

So there is about 2" in difference......

[langy]

Yes Dear - 205/80 are 29's, 235/75 are 30's 245/75 are 31's, 235/85 are 32's and 265/75 are 33's

( 205 wide x 80% tyre wall x 2 + 400( rim size) = diameter

[Blknight.aus]

the tread face should be a little over an inch wider and the rolling radius will be maybe an extra inch in the rolling radius of the 245/75's.

[Redback]

First number is the width of the tyre.

Second number is A % height of the sidewall* EDIT

Third number is the rim diameter

These 3 numbers determin the rolling diameter

eg

245/75/16 = 30.6"

245/70/16 = 29.5"

205/80/16 = 28.9"

[PhilipA]

In percentage terms it is about 6% difference in speedo reading , ie revs at say 100Kmh/pulling power/etc etc.
Regards Philip A

[350RRC]

First number is the width of the tyre.

Second number is the height of the sidewall

Third number is the rim diameter

These 3 numbers determin the rolling diameter

eg

245/75/16 = 30.6"

245/70/16 = 29.5"

205/80/16 = 28.9"

Sorry, your figures don't add up. The second number is the actually the aspect ratio of sidewall height / width. Low profiles are something 40 (% height / width) and higher profiles are commonly 75 (%).

Have a look here:

Yokohama / UNDERSTANDING YOUR TYRES (http://www.yokohama.com.au/tyretips/tyre_specs.aspx)

cheers, DL

[Redback]

First number is the width of the tyre.

Second number is A % height of the sidewall* EDIT depending on profile

Third number is the rim diameter

These 3 numbers determin the rolling diameter

eg

245/75/16 = 30.6"

245/70/16 = 29.5"

205/80/16 = 28.9"


Sorry, your figures don't add up. The second number is the actually the aspect ratio of sidewall height / width. Low profiles are something 40 (% height / width) and higher profiles are commonly 75 (%).

Have a look here:

Yokohama / UNDERSTANDING YOUR TYRES (http://www.yokohama.com.au/tyretips/tyre_specs.aspx)

cheers, DL

How's that:p

[cal415]

Book mark this page, very handy.

Tire size calculator (http://www.miata.net/garage/tirecalc.html)

[Scouse]

Book mark this page, very handy.

Tire size calculator (http://www.miata.net/garage/tirecalc.html)Nah, this one's better:

Tire Size Calculator - tire & wheel plus sizing (http://www.1010tires.com/TireSizeCalculator.asp)

Can compare 4 different tyres to your original & does "imperial" sizes to boot :).

[midal]

Book mark this page, very handy.

Tire size calculator (http://www.miata.net/garage/tirecalc.html)


Thanks for this one....really like the idea of the speedo % changes.:BigThumb:

Cheers
Mick

[Sleepy]

Nah, this one's better:

Tire Size Calculator - tire & wheel plus sizing (http://www.1010tires.com/TireSizeCalculator.asp)

Can compare 4 different tyres to your original & does "imperial" sizes to boot :).

That's a ripper Scouse - pity they can't spell Tyre proper.