Tire sizes picture comparison

[53k]

Today I was doing some wheel swapping in working on rear spring bushings on both my '64s. I decided to line up the three different sizes I had in comparison with a NOS 6.70x15 on a Studebaker wheel. I thought there was a thread on this before, but couldn't find it.

The tire on the right is a (sought after) P195x75x15 on a six-inch MoPar rim, the second from right is a P205x75x15 on a stock Studebaker wheel. The third from right is a P215x75x15 on a six-inch Magnum wheel and the tire on the left is a NOS Firestone bias-ply 6.70x15 on a stock Avanti rim. This is why I think a 215x75 is your best bet to duplicate the hright of an original 6.70x15 PROVIDED you use a wider rim.


[img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/R-4.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64L.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64P.jpg[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/53K.jpg[/img=right]Paul Johnson
'53 Commander Starliner (since 1966)
'64 Daytona Wagonaire (original owner)
'64 Daytona Convertible (2006)
Museum R-4 engine

[Tom Bredehoft]

I recently replaced the 7.60x15 Firestone (Cokers) with 215x75x15s on the same 5 inch wheels. The car lowered 1/2 inch and the speedometer/odometer is now off 5%, reading 62-3 at true 60 mph. I am willing to allow the error in exchange for a decent ride and handling. I felt that 225x75s were too wide for the 5 inch wheels, even though they approximated the right height. I'm surprised to see the 215s appear to equal the 6.70s.

Does anyone need five Nearly new 7.10 x 15 3 1/4" whitewalls? cheap? Well, relatively cheap. I can deliver to Winks.

[img=left]http://www.alink.com/personal/tbredehoft/Bothcars.jpg[/img=left]
Tom Bredehoft
'53 Commander Coupe
'60 Lark VI
'05 Legacy Ltd Wagon
All three Indiana built OD cars

[Tom Bredehoft]

I recently replaced the 7.60x15 Firestone (Cokers) with 215x75x15s on the same 5 inch wheels. The car lowered 1/2 inch and the speedometer/odometer is now off 5%, reading 62-3 at true 60 mph. I am willing to allow the error in exchange for a decent ride and handling. I felt that 225x75s were too wide for the 5 inch wheels, even though they approximated the right height. I'm surprised to see the 215s appear to equal the 6.70s.

Does anyone need five Nearly new 7.10 x 15 3 1/4" whitewalls? cheap? Well, relatively cheap. I can deliver to Winks.

[img=left]http://www.alink.com/personal/tbredehoft/Bothcars.jpg[/img=left]
Tom Bredehoft
'53 Commander Coupe
'60 Lark VI
'05 Legacy Ltd Wagon
All three Indiana built OD cars

[sbca96]

It might also be worth while to mount each tire on the car, then take
a measurement from center to the ground. Different tires will have a
difference in sidewall crush, this can result in lower or higher after
the tire has weight on it.

In a drastic example, my 245/45 R17 tires have barely any sidewall
crush compared to the 215/75 R15s that were on the car years ago. Its
also different from the 235/60 R14 tires that I had on it recently. I
think that this might contribute to the difficult steering that I had
with the skinny 75 series as compared to the wider 60 series on the
manual steering Hawk.

Tom

'63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires

[sbca96]

It might also be worth while to mount each tire on the car, then take
a measurement from center to the ground. Different tires will have a
difference in sidewall crush, this can result in lower or higher after
the tire has weight on it.

In a drastic example, my 245/45 R17 tires have barely any sidewall
crush compared to the 215/75 R15s that were on the car years ago. Its
also different from the 235/60 R14 tires that I had on it recently. I
think that this might contribute to the difficult steering that I had
with the skinny 75 series as compared to the wider 60 series on the
manual steering Hawk.

Tom

'63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires

[StudeRich]

Tom; what kind of a Stude could you possibly have had those monster Buick sized tires on? No Stude. ever got larger than 7.10X15 tires!
And the correct speedo gear would be for 6.70 most likely!

They were way too wide for 5 inch wheels. And I think if you do what Paul did, put the P215 X 75R15's on a 6 inch wheel, you will find it all works!

quote:Originally posted by Tom B

I recently replaced the 7.60x15 Firestone (Cokers) with 215x75x15s on the same 5 inch wheels.

StudeRich
Studebakers Northwest
Ferndale, WA

[StudeRich]

Tom; what kind of a Stude could you possibly have had those monster Buick sized tires on? No Stude. ever got larger than 7.10X15 tires!
And the correct speedo gear would be for 6.70 most likely!

They were way too wide for 5 inch wheels. And I think if you do what Paul did, put the P215 X 75R15's on a 6 inch wheel, you will find it all works!

quote:Originally posted by Tom B

I recently replaced the 7.60x15 Firestone (Cokers) with 215x75x15s on the same 5 inch wheels.

StudeRich
Studebakers Northwest
Ferndale, WA

[Tom Bredehoft]

I mis spoke, (first time ever) I took off 7.10 x 15s, not 7.60 x 15.

But.. My '50 Land Cruiser had 7.60s on it. Bought it slightly used as a demo from the dealer.



[img=left]http://www.alink.com/personal/tbredehoft/Bothcars.jpg[/img=left]
Tom Bredehoft
'53 Commander Coupe
'60 Lark VI
'05 Legacy Ltd Wagon
All three Indiana built OD cars

[Tom Bredehoft]

I mis spoke, (first time ever) I took off 7.10 x 15s, not 7.60 x 15.

But.. My '50 Land Cruiser had 7.60s on it. Bought it slightly used as a demo from the dealer.



[img=left]http://www.alink.com/personal/tbredehoft/Bothcars.jpg[/img=left]
Tom Bredehoft
'53 Commander Coupe
'60 Lark VI
'05 Legacy Ltd Wagon
All three Indiana built OD cars

[garyash]

Paul: What size tires did you put on your Wagonaire? I have the 6" wide Ford wheels with P205-75/R15 tires. The handling was very much improved, no problems with the disk brakes hitting anything. However, the sidewalls rub against the rear wheel opening lip if I park the car on the side of a hill. That might be because the previous owner swapped in a Twin Traction axle from a Hawk. Are the axle widths different? And, for sure, I need a bumper jack to get the body high enough to get the back wheels off.

On the other hand, how about 265-70/R17 wheels on a Wagonaire? I keep thinking how a 4-wheel drive Wagonaire would be neat. I Photoshopped my Expedition's wheels and running boards under the Wagonaire. A Studebaker Commander looks better than a new Jeep Commander. Yee-haw! [I had posted this picture previously].


[img=left]http://www.studegarage.com/images/gary_ash_m5_sm.jpg[/img=left] Gary Ash
Dartmouth, Mass.
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.com

[garyash]

Paul: What size tires did you put on your Wagonaire? I have the 6" wide Ford wheels with P205-75/R15 tires. The handling was very much improved, no problems with the disk brakes hitting anything. However, the sidewalls rub against the rear wheel opening lip if I park the car on the side of a hill. That might be because the previous owner swapped in a Twin Traction axle from a Hawk. Are the axle widths different? And, for sure, I need a bumper jack to get the body high enough to get the back wheels off.

On the other hand, how about 265-70/R17 wheels on a Wagonaire? I keep thinking how a 4-wheel drive Wagonaire would be neat. I Photoshopped my Expedition's wheels and running boards under the Wagonaire. A Studebaker Commander looks better than a new Jeep Commander. Yee-haw! [I had posted this picture previously].


[img=left]http://www.studegarage.com/images/gary_ash_m5_sm.jpg[/img=left] Gary Ash
Dartmouth, Mass.
'48 M5
'65 Wagonaire Commander
'63 Wagonaire Standard
web site at http://www.studegarage.com

[53k]

quote:Originally posted by garyash

Paul: What size tires did you put on your Wagonaire? I have the 6" wide Ford wheels with P205-75/R15 tires. The handling was very much improved, no problems with the disk brakes hitting anything. However, the sidewalls rub against the rear wheel opening lip if I park the car on the side of a hill. That might be because the previous owner swapped in a Twin Traction axle from a Hawk. Are the axle widths different? And, for sure, I need a bumper jack to get the body high enough to get the back wheels off.
On the other hand, how about 265-70/R17 wheels on a Wagonaire? I keep thinking how a 4-wheel drive Wagonaire would be neat. I Photoshopped my Expedition's wheels and running boards under the Wagonaire. A Studebaker Commander looks better than a new Jeep Commander. Yee-haw! [I had posted this picture previously].

I have P195x75x15 tires on MoPar six-inch wheels. The reason I have the 195s is realy dumb. Some years ago the metric 195x15 was an exact match for 6.70s. When I ordered the 195s from a local dealer, I didn't realize that they were smaller (too small for the Wagonaire). I thought all the Dana 44 rear ends were the same. Maybe the Ford wheels have a different back set than the MoPars. When I put 225x75s on 6.5 inch MoPars to put on my Avanti, I tried one on my Wagonaire and it gave me maybe an 1/8 inch sidewall to fender opening. I have it on stands now with one rear wheel off. When it cools a little, I'll try the six-inch Magnum with the 215s on it. Yes, you have to use a bumper jack to take off even the original narrow 6.70s.
Love your Commander 4WD. I would think a Jeep Cherokee chassis would work for such a conversion. I know that Gerry Early, Greater Virginia Chapter, put a short wheelbase Transtar right on an old Grand Cherokee(?) chassis with great success.


[img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/R-4.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64L.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64P.jpg[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/53K.jpg[/img=right]Paul Johnson
'53 Commander Starliner (since 1966)
'64 Daytona Wagonaire (original owner)
'64 Daytona Convertible (2006)
Museum R-4 engine

[53k]

quote:Originally posted by garyash

Paul: What size tires did you put on your Wagonaire? I have the 6" wide Ford wheels with P205-75/R15 tires. The handling was very much improved, no problems with the disk brakes hitting anything. However, the sidewalls rub against the rear wheel opening lip if I park the car on the side of a hill. That might be because the previous owner swapped in a Twin Traction axle from a Hawk. Are the axle widths different? And, for sure, I need a bumper jack to get the body high enough to get the back wheels off.
On the other hand, how about 265-70/R17 wheels on a Wagonaire? I keep thinking how a 4-wheel drive Wagonaire would be neat. I Photoshopped my Expedition's wheels and running boards under the Wagonaire. A Studebaker Commander looks better than a new Jeep Commander. Yee-haw! [I had posted this picture previously].

I have P195x75x15 tires on MoPar six-inch wheels. The reason I have the 195s is realy dumb. Some years ago the metric 195x15 was an exact match for 6.70s. When I ordered the 195s from a local dealer, I didn't realize that they were smaller (too small for the Wagonaire). I thought all the Dana 44 rear ends were the same. Maybe the Ford wheels have a different back set than the MoPars. When I put 225x75s on 6.5 inch MoPars to put on my Avanti, I tried one on my Wagonaire and it gave me maybe an 1/8 inch sidewall to fender opening. I have it on stands now with one rear wheel off. When it cools a little, I'll try the six-inch Magnum with the 215s on it. Yes, you have to use a bumper jack to take off even the original narrow 6.70s.
Love your Commander 4WD. I would think a Jeep Cherokee chassis would work for such a conversion. I know that Gerry Early, Greater Virginia Chapter, put a short wheelbase Transtar right on an old Grand Cherokee(?) chassis with great success.


[img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/R-4.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64L.JPG[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/64P.jpg[/img=right][img=right]http://www.frontiernet.net/~thejohnsons/Forum%20signature%20pix/53K.jpg[/img=right]Paul Johnson
'53 Commander Starliner (since 1966)
'64 Daytona Wagonaire (original owner)
'64 Daytona Convertible (2006)
Museum R-4 engine

[showbizkid]

Gary, amazing how much your p'shopped pic looks like a Jeep Wagoneer! Coincidence? I think not....!


[img=left]http://members.cox.net/clarknovak/lark.gif[/img=left]

Clark in San Diego
'63 F2/Lark Standard

http://studeblogger.blogspot.com

[showbizkid]

Gary, amazing how much your p'shopped pic looks like a Jeep Wagoneer! Coincidence? I think not....!


[img=left]http://members.cox.net/clarknovak/lark.gif[/img=left]

Clark in San Diego
'63 F2/Lark Standard

http://studeblogger.blogspot.com