Rear tires have bumps, not true anymore ?

[nnewell]

Could be tire tread separation and you should get the tires looked at.

Here's an explanation Tire Tread Separation Animation - YouTube

[Spinnaker]

If your tires are older than 6 years, they are past the recommended service life and can experience tread separation issues. Get some new tires before you have a blowout or tread separation, and risk of an accident.

[jim_hoyland]

Thanks for the feedback, the tire separation video is great.
The tires are Pirelli 255/40/17 P-Zeros. The "bumps" are on the tread and are too subtle to get a good picture.
Question: Is there a date of manufacture on the tire ?
And, yes I'll replace them.

[healthservices]

sound like the tires are feathering. usually a toe issue

[BYprodriver]

Originally Posted by jim_hoyland

Thanks for the feedback, the tire separation video is great.
The tires are Pirelli 255/40/17 P-Zeros. The "bumps" are on the tread and are too subtle to get a good picture.
Question: Is there a date of manufacture on the tire ?
And, yes I'll replace them.

If the bumps are that small it could be caused by worn struts or the alignment being off.

All tires have a date code at the end of the serial number after the DOT the stamped number is 4 digets & the last diget is the year.

[BYprodriver]

Originally Posted by BYprodriver

If the bumps are that small it could be caused by worn struts or the alignment being off.

All tires have a date code at the end of the serial number after the DOT the stamped number is 4 digets & the last diget is the year.

Serial # is molded onto the tire, date code is stamped after the molded #

Another sign the tire rubber is hardening is cracks in the rubber. Worst place is right next to the wheel rim