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Discussion Starter #1 (Edited)
I've been working to quiet the interior of my `19 Bolt, and thought I'd share the experience. Here are the things I've done to kill the noise, in order by most effective to least:

- Dynamated the doors. I had a Car Toys shop install a layer of dynamat damping material on the inside surface of the sheet metal inside the doors. I didn't do this myself, as I didn't want to chance breaking the little plastic fasteners.

- Installed auto weatherstripping to improve the seal of the doors and reduce noise from getting in past the OEM rubber seals. I used these materials, and mostly just ran a second D-shaped strip up against the factory seals around the side and bottom edges of the doors. This was an easy three hour project. I used one package of the z-strip, and two each of the D-shaped stuff. So far is has all stayed in place, and does not make it any more difficult to close the doors.
https://www.amazon.com/gp/product/B01MED8YPP
https://www.amazon.com/gp/product/B07GS57TX7
https://www.amazon.com/gp/product/B07C8LT1R5

- Replaced the factory mats on floors and in the trunk with LLoyds Luxe Carpet Mats. These are both luxurious and sound-deadening, as they have a layer of rubber foam bonded to the thick, dense carpeting. https://www.lloydmatsstore.com/luxe-floor-mats

- Replaced the OEM fabric trunk cover with a solid Boltshelf: https://voltshelf.weebly.com/boltstuff--boltshelf-boltscreen-boltport-cover-boltphone-and-boltmat.html An alternative would be the molded Chevy accessory replacement shelf.

Bottom line is that while my Bolt still isn't Cadillac or Tesla quiet, it is a lot less annoying now, and on smooth-surface roads it is pretty good, with quite a bit less tire and wind noise.
 

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Good info! I'm seriously considering doing the dynamat in the doors. My wife's Buick has I think triple weather stripping as a "Buick" feature on quieting the cabin. I may consider that too.
 

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Did you do any DB readings? On certain stretches of freeway near my home, I get DB readings of between 67 to 75, depending on the surface. I'm wondering how much the tires might be contributing to noise and if different tires might help. I plan on getting some sound-deadening materials installed, just waiting for supplies to arrive. Buick does a good job of making a quiet car. When they eventually make a small EV, I'll take a close look at it. The noise level in the Bolts is an issue which I highlight in every feedback or review I participate in. Maybe the 2021 model will address this.
 

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Wow
Must really really be quiet
How about styrofoam filled tyres?
Seems most sound is from road noise?
At one time, Continental Tire made a ContQuiet tire that lined the inside of the tire opposite the tread with a type of foam. It was supposed to make a large difference in the amount of tire noise. There are still a few web pages that show the tire, but it no longer seems to be available.
 

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At one time, Continental Tire made a ContQuiet tire that lined the inside of the tire opposite the tread with a type of foam. It was supposed to make a large difference in the amount of tire noise. There are still a few web pages that show the tire, but it no longer seems to be available.
OEM Tesla tires have the foam on the inside.
 

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Here you go - the latest marketing gimmick. Apparently no longer available from Conti because they barely made any difference.
Interesting article. But, it focuses on noise from impact of road obstacles: rumble strips, grooves, potholes and such. I'd be more interested in the effect on the typical tire whine and rumble from unbroken pavement. Still, I'm not aware of any tires generally available that incorporate foam anyway. If I had the option, I might choose such a tire when due for a change, though without a spare, it might be risky. Fix-A-Flat might not work with those tires.
 

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OEM Tesla tires have the foam on the inside.
Continental still makes some ContiSilent tires with foam opposite the tread, but it is only available in limited models and sizes, nothing to fit the Bolt. I recently ran into it while looking at tires on TireRack.com
 
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