7.50 x 16 tyres size please

[baz2236]

Can anyone tell me what the metric size is for this size tyre and how big the total wheel size should be.

Thanks,

      Baz

[brewster]

Right Bud,

This takes some explaining!  7.50 is a metrified notation of an imperial size, so what it actually means is seven and a half inches!  If you then multiply 7.5 by 25.4 (there being 25.5mm to the inch) you end up with 190.5.

Now it is assumed that the aspect ratio of these tyres is 100% so to be absolutely accurate the metric tyre size is 190.5/100r16.  Now you try buying one!  For a start the nearest width generally for sale is 195, but you wont get a profile section of 100%.  So to keep the same circumference you need to increase the width and decrease the profile.  Generally speaking 235/85r16 is good to within a percent or two (so your speedo will not be too far out).  However if you are increasing the width by 45mm you need to make sure your rims are wide enough.

Rims should be about 70% of the tyre width so if you go for the 235s, the rim should be about 164mm or 6 and a half inches, you could go up to 8 inches.  Chances are that you might have 5 and a halfs with your 7.50s!

Hope this helps but if you would like to check out the facts, with some handy calculator tools look here:

http://www.carbibles.com/tyre_bible.html

Later...

Paul

[glaggs]

http://www.4x4mag.co.uk/novfeatures/novtyres.htm

Try this link - It explains some of the confusion!

[larry]

i have found different manufacturers tyres come up slightly different  sizes  just like shoes and trainers

[glaggs]

Yes, tyre manufacturers are aloud a 10% varience for any given tyre size. The only size that is and must be 100% constant is that of the rim size ie 15" will always be the same etc.

[Jim-Willy]

32"ish.  Nearest metric equivalent is 235/85 x 16 which will be very similar height but a bit wider..........