Cabin noise difference between 20 inch and 21 inch wheels

[captainlk]

Does anyone have experience with both the 20s and 21s and can comment on the cabin noise?

The Mission E wheels looks fabulous but I would also like a relatively quiet cabin at motorway speeds.

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[Vercingetorix]

Tires will make way more of a difference than rim diameter.

 

[W1NGE]

Does anyone have experience with both the 20s and 21s and can comment on the cabin noise?

The Mission E wheels looks fabulous but I would also like a relatively quiet cabin at motorway speeds.

I've driven both and IMHO no discernable difference at motorway speeds. The car is already quiet and sound-proofed accordingly given it is an EV. I have 20" and driven a Turbo, Turbo S and CT 4S with 21s and couldn't detect a discernable audible difference. Air suspension helps a lot here too.

The optimum is to add noise insulating glass (I've not done that).

I had 21s on my Cayenne and didn't like the ride (even with air) and 21s on my Pana ST (with air and a sublime ride). Taycan rides better and quieter by a country mile.

In summary, you won't really notice a difference in noise, sound proofing in the car is great and you can go the extra mile by insulating the glass. One thing to note is the reparability of the MIssion E wheels after kerbing - I've heard it can be difficult.

 

[B61]

I have 21" CT design and I'm replacing tomorrow with 20" (winter tyres)... but as @W1NGE said, I'm not expecting some serious difference (even without any music).

 

[Ll312]

As said before, tires are more likely to make a difference than the rim itself. Fwiw, I have not noticed a difference between my 21” Wheel/tire combo and my 20” winter setup.

 

[PanameraFrank]

Winter vs Summer tires slightly increase the noise, but I didn't notice any significant difference between test driving 21s and my 20s.

If you get the Insulated Glass I don't think you'll notice a difference even from summers to winters, one option I wish I had gotten.

Car is still super quiet without insulated glass but the ones I've been in with it are just bank vaults.

 

[KTC]

Probably depends more on what tires you're running. Fewer choices for 21" as of this time.

 

[B61]

Quick report: changed 21” summer to winter tyres on 20” wheels … first thought: same level of noise.
I was trying to hear the difference, but I think it’s the same.…then I turned car play on.
afterall, i didn’t buy bose to have it off

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