View Full Version : Tire flat spots

03-27-2008, 02:42 AM
I'm running on bias ply tires that came with the truck. Just sitting overnight the tires go thump, thump, thump the next morning until they warm up. The weather is not cold - almost 80*. Is this normal?


03-27-2008, 03:28 AM
For Nylon cords, yes.

04-01-2008, 12:54 AM
I second that with a yes, as well. I drive offroad and my rig only gets driven every month or two. It has bias plies on it (40 inches) but they have flat spots you can actually see. But, like you said, once they get rolling, they become somewhat round again.

1961 Studebaker Lark VIII. 6x,xxx miles from the factory. Daily driven.

04-01-2008, 11:39 AM
Boy, you brought back some memories. Back in the '60s it was quite common to get that thump, thump from the nylon cord tires, especially when it was cold weather. It always stopped after a few miles when the tires warmed up.
Since I'm running radials on my '59 Lark, I've totally forgotten about the thumping.
Long story short: It's not a problem with the tires. Just normal.

'59 Lark VI Regal Hardtop

04-01-2008, 11:47 AM
Just one caution about the tires. If they are old, and I suspect they are, I'd be very wary of driving on them at speed.


04-02-2008, 04:15 PM
.....I was shopping tires last week. Went to Sears and they brought out a tire that had an obvious flat spot on it. Saw it across the room. 205 x 15 75R

04-02-2008, 07:32 PM
These tires are about a year or two old but I still don't trust them. The truck seems to "drift" occasionally at highway speeds. At first I thought it was the wind but it's not that windy. It' time to go shopping.