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Daves55Sedan · 11-07-2019, 12:08 AM

I have P205-75R-15's on the front and P205-75R-15's on the back of this '55 Ford car in the avatar.
Reason being that the overall diameter of the 75 series is larger than the 70 series and the 75 series is about as close as you could get to the stock tire diameter.
I checked my speedometer against some of those roadside speed indicators and found I did not need to change my speedo driven gear. It's probably within 1/2mph.
Thing is, the radials are a TON wider than the old 710x15's, so the rear wheels are more difficult to get on and off. But you shouldn't need to worry about rubbing. There is enough clearance.

11-07-2019, 12:08 AM	#5
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: Radial Tire Size for 55/56 Ford I have P205-75R-15's on the front and P205-75R-15's on the back of this '55 Ford car in the avatar. Reason being that the overall diameter of the 75 series is larger than the 70 series and the 75 series is about as close as you could get to the stock tire diameter. I checked my speedometer against some of those roadside speed indicators and found I did not need to change my speedo driven gear. It's probably within 1/2mph. Thing is, the radials are a TON wider than the old 710x15's, so the rear wheels are more difficult to get on and off. But you shouldn't need to worry about rubbing. There is enough clearance.