Thumping noise after changing to summer tires

[long tall eta]

if it's only when turning right it must be in the front. is that where it sounds/feels like it's comming from? also does it seem like it's with every wheel rotation that you hear/feel it?

[ev87]

Appreciate everyone's help.

Problem is still ongoing. It does sound like it's coming from the front. It's definitely periodic, and while I don't know what the period of the noise is, it increases with speed, and I wouldn't be surprised if it's every revolution. Any chance there's something wrong with the tire even though I couldn't find anything with a pretty thorough visual inspection?

[FLG]

Flat spot on the tire?

Grab the spare, try it on the front right, than the front left. If the problem is still there regardless..its an issue with the car. If the problem goes away by swapping out one of the wheels than its an issue with that wheel/tire.

[nando]

how/where were the tires stored? did you have them in bags?

[ev87]

Update: it's solved!

Man that was a weird one. So the front left was rubbing up against the strut. Ended up putting the winters back on one at a time until I figured this out, and then un-rotated the summers to what they were last year. Everything works. I have no idea why the rubber on one tire sticks out more than on another at the same pressure, but I'll chalk this one up to the Car Gods and just enjoy everything being fine again.

Thanks again to everyone who chimed in and got me on the right path to figure this damned thing out!

[jeffnhiscars]

Check your Bentley...no tire rotation on E30.

"BMW does not recommend tire rotation. Owing to the car's
suspension design, the front tires begin to wear first at the outer
shoulder and the rear tires begin to wear first at the m iddle of
the tread or inner shoulder. Rotating the tires may adversely
affect road handling and tire grip."

I discussed this with a friend of mine who was a BMW Service Manager (who owned a full Dinan SC e36 M3 and a 308GTB). He said if you are going to rotate, do it front to rear only and often (as in every 3-5k). Once the wear patterns set the concerns mentioned in the owners manual become more relevant.

Don't shoot the messenger.