Re: Adverse effects of upsizing rims and tires 2000 323i E46.
Rock, you're correct. I usually drive at the fine line of speed limit, going above it by 8. Because I know the speedo is incorrect, i add in another 5 on top. When I had my 19s I only added the 8 plus maybe 2 on top.
Benefits of bigger rims: more than likely better than what you have on, looks better with a lowered car, more rubber width wise should equal better traction and handling if rims are within the limits of what your car can handle.
Negative: upkeep cost, tire replacement more frequent, more than likely unless you spend a fortune it'll be heavier and slow you down, more likely to be targeted for theft, easier to bend or damage rims
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