1935 Auburn 851 what the correct tire construction type for this car

1/8 toe-in , shims can be bought at NAPA.

Radials correct many sins, but get the car right first with the bias ply tires you have on it - needs caster, camber, and toe in checked, as well as must have true rear axel mounting and go down the road straight. Ask around for someone who sets up race cars.

Amen Craig. Check toe-in first.

Your 851 originally came with bias ply which don't track quite as well as newer radials. To little toe in could be your problem. If you haven't done it yet check for play in tie rod ends, wheel bearings, steering box. There are also supposed to be caster shims between the springs and axle. That can affect tracking. I had an 851 that was missing them.

My car steers left & right and doesn't track straight. Kurt told me last year
I was using the wrong tire ie: bias ply tires.
However, I forgot which tire construction tire i should use.
Thanks for your input in advance.
Paul Pustay