Tyre Sizes

Submitted: Friday, Jul 08, 2005 at 16:50
ThreadID: 24559 Views:2006 Replies:5 FollowUps:1
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Gidday All,On a recent trip halfway the cape I ripped the side out of one of my tyres on the 1994 cruiser.The size of the tyre on the 4BY is 275x70rx16.I have sitting in the shed a 265x75rx16 light truck(brand new).My question is what is the difference in diameter size and can I use it on the 4BY.
Thanks Locallaw
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Reply By: Member - John C (QLD) - Friday, Jul 08, 2005 at 16:54

Friday, Jul 08, 2005 at 16:54
Rough calc.

75% of 265 is 199mm.

70% of 275 is 193mm.

difference in tyre wall height is 6mm, so diameter should be about 12mm larger with the 265/75.

Could you place one next to the other just to check?

Hope this helps.
AnswerID: 119463

Reply By: sshep - Friday, Jul 08, 2005 at 16:56

Friday, Jul 08, 2005 at 16:56
try this web site it will have the sizes in the tyre calculator ; www1010tires.com. good luck
AnswerID: 119464

Reply By: Exploder - Friday, Jul 08, 2005 at 16:59

Friday, Jul 08, 2005 at 16:59
It would be close to the same height. Just line it up next to one of the other tyres and check the height deferens. Would not recommend running different size/ pattern tyres as it can affect grip, handling also mechanical part’s if big deferens in height.

I would think height wise the tyre would be so close it would not be an issue and only 10mm smaller in width so yes if you MUST use it there should not be a problem.

I would put it on the back not the front.
AnswerID: 119466

Reply By: Member - Roachie (SA) - Friday, Jul 08, 2005 at 17:09

Friday, Jul 08, 2005 at 17:09
275 x 70% = 192.5mm x 2 = 385mm div by 25.4 = 15.15" + 16" (wheel) =31.15"

265 x 75% = 198.75mm x 2 = 397.5mm div by 25.4=15.64"+16" (wheel)= 31.64"

So, about 1/2" diameter difference if I've done it right. Near enough to be quite compatible.

Cheers
Roachie
AnswerID: 119467

Reply By: locallaw - Friday, Jul 08, 2005 at 17:40

Friday, Jul 08, 2005 at 17:40
Gidday All,Thanks to everyone that replied.I checked visually and there seems little difference in the size.I have now fitted it to the spare.
Thanks again
Locallaw
AnswerID: 119469

Follow Up By: Member - John C (QLD) - Friday, Jul 08, 2005 at 17:44

Friday, Jul 08, 2005 at 17:44
Good to see you have checked.

Tread could 12mm deep, or 24mm on dia.

So 12mm difference on dia is about half wear, so not alot of difference!

And also depends on how the tyre bags with load, some more than others to get loaded rolling radius.

So tyre sizes are an approximate science.
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FollowupID: 374547

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