I have a tubular axle on my '29 and it's wearing out tires at the outer edges after 5,000 miles or so. I've confirmed that the camber is within the 1/2 to 1 1/2 degrees range for bias ply tires. Speedway Motors told me that all of their tubular axles are built to those specs, so replacement doesn't seem like an option. Caster is 6 degrees and toe-in is 1/8 inch.

The literature and at least one teaching mechanic confirmed that that camber spec is for bias-ply tires, while 0 degrees camber is recommended for radials. I know that people run tubular axles with radials and my question is: how do they / you do it? Is it a magical combination of wheel diameter and width and tire size? Or, do you have the axle bent to get the correct camber?

After 20 seasons on the road, I've decided to garage the car until I sort this out. It needs yet another set of front tires and I'm tired of paying for tires that only last two or three seasons. If the right answer is to replace all four tires with bias-ply, I'll go that route, but I'd like to be as sure as I can that it will solve the problem.

Thanks, everyone.