[gokcer]

I just got a 04 325 loaner with 16 rims and it is so much quiter than my 323 17' rims. I was just curious if it is the rims or the 04 models have better sound insulation?

 

[dbtheo]

both

 

[bobm3]

i would say its because

of the tire and not to much the difference of the wheel size. also
the insulation is better on the 04 to.
bobm3

 

[gokcer]

Dam cant we add the insulation our selves to make it more quite in the cabin?

 

[bbh03]

"Does going 16' to 17' rims increase interiror noise?"

16 foot and 17 foot wheels? Wow, your car must be huge! lol

 

[sfzBimmer2]

Road noise goes up because most people go to a lower profile tire when buying larger wheels. The lower profile, ideally, should maintain the same rotational diameter, so your speedo is off. Plus, as enthusiasts, we're drawn to the greater handling benefits of low-profile tires.

The downside to a lower profile tire is that there is less rubber and air between the road the wheel (which transmits shocks to the rest of the car), so there will be greater noise and more bumps. If you want less noise, look for a tire with a history of low noise or just get a bigger profile.

 

[classiguy3]

I concur with sfx...