What is 10R15 tire size ????
Submitted: Tuesday, Dec 05, 2006 at 23:07
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hmd100100
I am very familiar with the two tire size standards, for xample 235/70-15 or 31x10.5, but I could't figure out what 10R15 is equivelant to in these two standards.
It looks like a 255/75-15 or 30x10
Am I correct ?
Reply By: Member - Roachie (SA) - Tuesday, Dec 05, 2006 at 23:28
Tuesday, Dec 05, 2006 at 23:28
AFAIK the 10R15 is only part of the size code. It would be something like 31x10R15; where 31 is the overall diameter in inches, 10 is the nominal tread width in inches and the 15 is the wheel diameter in inches.
The 255/75-15 you quote (or as I would quote it; 255/75R15) is different; partially metric. 255 is the nominal tread width in mm, 75 is the aspect ratio of the tyre from the tread to the rim and (again) the last number is the rim diameter in inches. To calculate the overall diameter of one of the these tyres, you need to calculate 75% of 255 (= about 191mm), x 2 (to give you the total aspect of the tyre, top and bottom) = 382mm. Divide this figure by about 25 (plus point something or other), to convert that to inches (say 16" for the sake of the argument....as I don't have my calculator handy) and then add on the rim diameter of 15"; giving you a total diameter for that tyre of about 31". Phew!
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Follow Up By: Willem - Wednesday, Dec 06, 2006 at 00:15
Wednesday, Dec 06, 2006 at 00:15
You are a wealth of
information, Bill, even this late at night.....LOL
I know nothing about tyres...I just stuff 'em...hahahaha
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Follow Up By: traveller2 - Wednesday, Dec 06, 2006 at 08:11
Wednesday, Dec 06, 2006 at 08:11
The 10R15 was always regarded as about the same diameter as a 700x16 back in the days when wide tyres were a rarity.
Some were a tad bigger in diameter but always less than a 7.50 x 16.
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Follow Up By: Pajman Pete (SA) - Wednesday, Dec 06, 2006 at 09:14
Wednesday, Dec 06, 2006 at 09:14
"I know nothing about tyres...I just stuff 'em..." in your shed.
From your last post about tyres Willem, you have enough to start your own
shop!
Cheers
Pete
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Reply By: Member - Karl - Wednesday, Dec 06, 2006 at 09:34
Wednesday, Dec 06, 2006 at 09:34
As Roachie said 10R15 is only a part of the size equation - 10 is tyre width (in inches) R is for radial and 15 is diameter of rim (in inches as
well). You need another set of number before these to give you the over all tyre size i.e. 31 10R 15 is a 31 inch tyre, 10 inches wide, Radial on 15 inch rim.
After that it all becomes confusing for me.
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208883
Follow Up By: GaryInOz (Vic) - Wednesday, Dec 06, 2006 at 11:38
Wednesday, Dec 06, 2006 at 11:38
Going wayyyyyyy back, I seem to remember that the absence of a profile number meant the tyre was a "normal" radial tyre of 85% profile. It was only when the manufacturers went to "low profile" tyres that they started to include the profile size into the code.
my best guess that it is a 32" (8.5+8.5+15) diameter 10" wide radial tyre sitting on a 15" rim.
Most reasonable replacement would be the 33x10.5R15, being that most tyres these days measure less than what the state they are.
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Follow Up By: GaryInOz (Vic) - Wednesday, Dec 06, 2006 at 11:42
Wednesday, Dec 06, 2006 at 11:42
I believe it was a blend of the old bias ply "X00 x rim size" where they simplified it to make it easier to understand (dropping the "00") and including the "R" in the middle to denote radial.
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Reply By: hmd100100 - Wednesday, Dec 06, 2006 at 21:14
Wednesday, Dec 06, 2006 at 21:14
O.K. Thanks guys for info. But the story is that I bought a used Jeep Cherokee and it came with these tires: Bridgestone Dueller H/L and the only numbers on them are:
10R15LT 6PR 109S 683 (I checked aging today). I also went to Site Link to
check these codes. The only one I can explain is the 109S which stand for LOAD and SPEED as follows:
109= 2271 lb or 1030 kg, S = 112 MPH, 180km/h
It seems that the 10R15LT (As some of you mentioned) stands for:
10 = Tire width in inches, R=Radial, 15=rim size (diameter) in inches which is correct because the rims are the original Jeep 15” rims. LT=Light Truck.
Soooooo, where is the tire diameter. There is no “31” or “32” near these numbers and I don’t know what 6PR and 683 stand for. Can someone extract the tire diameter out of these numbers?
The tire “looks” like a 30x10 or 31x9.5. It does have a high profile, but it does not look bigger than a 31 because I have seen a 31 size tire and these are not bigger than that.
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Reply By: Member - Phil G (SA) - Thursday, Dec 07, 2006 at 12:44
Thursday, Dec 07, 2006 at 12:44
10R15 is almost identical to 31x10.5R15
The terminology was changed when they were trying to standardise tyre language about 15 years ago. These two sizes are interchangable. I'd guess that you would no longer be able to buy a 10R15 new.
For a while Bridgestone gave you a choice between Japanese made Desert Duellers (10R15) or Australian Made desert duellers (31x10.5R15). these were the common size that went on Sunraysias on the older Patrols and Cruisers.
AnswerID:
209139