Hi I am new to this Discussion I currently purchasing a 64 Deville convertible and It has bias ply tires that are 15 year old they have L-78-15 tires and would like to put on radials . Question what is a good cross to radial tire and is l-78-15 the original tire size. Thanks Mark
The 235/75R15 is a good match. Look into the Ironman tires for a white wall.
Hi Russ I am looking at the 235 75R15 in Ironman are those the RB12 after the tire size Thanks
Hey Russ what size white wall do you recommend and what was the stock width Thanks
I went with the ironmans, they ride well and feel good on the car. the width wall width is 1 inch. Not sure what the stock width is.
Original white wall width and distance from rim across the 3 tire suppliers is discussed in our Tires: Original Tires and Rims (Wheels) used on 1963 & 1964 Cad... Scroll down and you will see chart. Help Page.
Hi Russ looked at the Ironman Tires quite a few people are complaining the white wall turns brown after a year have you had this issue
pretty sure you are going to enjoy the driving experience that radial tires bring especially after old tires
Lowers the car one inch -much better cornering - braking and gas mileage ( enough? )
Our Cadillacs have unique rim weights for tire balancing
You will not ——-get your hubcaps back on with the weights the shop currently use
I left the weights in the same location cleaned the inner rim surface and crazy glued them to the rims lip
That worked for me
You should be very pleased with the results as it will be a big change in performance — the cloud 9 ride should be closer —- to back !!
Thank you Tony, So you agree with Russ Austin the 235 75 R15 ? Have you tried stick on weights for mag wheels?
I am surprised you don't run Bias Ply on your Eldo. I am strongly considering it for my 64 Fleetwood. By all accounts I have heard, the driving feel is better than radial. Bias Ply being softer. I am not a speed runner and most of the area around here is flat- so no large concerns there. The occasional jaunt on the freeway is the fastest I ever make it.
From my own experience the radial tire is a softer and better ride as the side walls of the tire flex more than that of a bias ply tire that is a more rigid core design
They absorb the shock of a pot hole more than a bias ply tire does as an example
Again your car - do what is best for your goals
Bias ply tires ride harder than radials who’s sidewalls flex more than bias ply much improving cornering - less rolling resistance equals better gas mileage — better stopping power
There are a good number of other benefits with 50 plus years of tire technology improvements behind redials
All new modern cars are on radials from the showroom
I am old enough to remember when all cars came with bias ply tires new so have experience with both first hand
Coker makes a tire that looks like an older bias ply tire ( if looks is your thing ) and are radial tires but they are expensive
Hope that helps some
Do not recall my tire size at the moment but Russ is as good as it gets regarding our year Cadillacs info