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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2020 Posts: 21 'Bolter | | 'Bolter Joined: Nov 2020 Posts: 21 | Can I use a 8.25x15 tire on a rim that has a 8.25x20 tire on it?
Found the 15's cheaper and seeing if its comparable | | | | | Joined: Feb 2004 Posts: 29,837 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,837 | Since the last number in the sequence is the rim diameter in inches- - - - -NO! The hole in the middle of the tire would be 5" too small! Good luck getting it to stretch over a 20" diameter rim!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2020 Posts: 21 'Bolter | | 'Bolter Joined: Nov 2020 Posts: 21 | Thanks still new in this department and with 2 numbers to go with on tire size wasnt sure if it was inches or something else | | | | | Joined: Oct 2021 Posts: 6,902 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,902 | 8.25 = section width = width of tire mounted on wheel (may be slightly wider than tread width)
15 = rim diameter in inches
My tires 215 / 70 x 16
215mm = section width
70 = aspect ratio = height of sidewall from ground to rim = 70% of section width = 150.5 mm
16 = rim diameter in inches
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Feb 2004 Posts: 29,837 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,837 | Otto, I've encountered a few tires labeled with the rim diameter in millimeters- - - - -now, that can really get confusing!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2021 Posts: 6,902 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,902 | No doubt!
Luckily once I find a size that works on a particular vehicle, I never change.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
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