im thinking of getting 18 inch rims for my bonneville and wanted to know if u guys could give me some pros and cons.on road noise, comfort, wearing on shocks or struts?

first con that comes to my mind is your probly gonna notice some performance loss...those 18s will take more force to get em moving so your car may not perform quite as well....comfot probably isnt going to be exceptional either because youll have some pretty low profile tires on there which wont absorb bumps nearly as well. youll probly feel every little bump on the road to some degree...and those rims could be easily bent if your not careful...because less force is being absorbed by the tires when you hit a bump you could bent em.....your handling will be a tad quicker due to less sidewall flex on the tires...and itll probly feel more stable in the corners cause the tires wont move around and flex as much....there are some ppl here with 18s...you could talk to them. personally id say get some good lookin 16s or 17s

18'* = more rotating mass meaning less acceleration.

In order to keep the same dimensions if you go with 18'* you will probably get shorter tires meaning your ride may suffer a bit as you wont have a lot of rubber to cushion. Also depending on the size of the tire, potholes may damage your rims more easily.

Talk to BonneAlien, he has 18'*...

As does FiReDeViL. Cue one of em here???

I'd personally stick with slightly smaller rims...firstly and foremost because of weight, secondly because I'm too dang cheap

--Christine

firedevil has 17'* i believe..

i have big thick 235/50 series tires on my car so it doesnt feel more " bumpy " when i drive.. however, i do lose alot of performance.. especially b/c they are chrome. I am ALOT faster with my stock 16'* on. Either way, it looks gorgeous comin' down the road..and the 18'* kinda make the car look newer b/c thats a new fashion for the upcoming cars is bigger rims. I'd say some phat 17'* is the way to go. If i could go back i woulda found some 00+ SSEi rims.

also, with the 50 series tires.. it is possible to rub if i turn all the way to one side ..which kinda sucks.

exactly, I run P255/45 though, meaning I have way more tire than rim. The down side is the acceleration thou, the RPM'* usually stay around 2 with all that added wieght. I have a ninety two thou, Later years with low miles wouldn't really suffer riding 18'*.

My car had 235-55-17 rims and tires on it and I went to 255-45-18 and saw no difference in the ride or acceleration/braking. In fact the ride and road noise is better with my falkens than with the goodyears.

I have 18s and they did not change the ride or comfort! May have lost a little acceleration, but can still burn em off! Only thing I would do is get some bigger breaks so you don't wear em like I did! I run a 245/45 zrated dunlop sport 9000 and love em! Handling improved allot with the 18'* +Z rated tires! Sticks like glue!

going from stock 60/16s to 245/18s is only a millimeter different. there is no loss of acceleration b/c of increased mass. the radius from the center of the hub to where the tire meets the ground is still the same size. you would lose acceleration if you ran a larger tire size but then also your speedometer would be off and you would have to get your PCM reprogrammed for it to work correctly and you amy have problems with rubbing in your wheel well.
There may be slightly more road feel but thats what i want when driving a sports car. it handles much better around turns as there is not as much rubber folding under plus i went from 225s to 245s wich helps. i never leave the performance mode for suspension anyway. If i want a comfortable ride, i can still switch to normal mode and it floats like a boat.

i think the bonnes look phat with 18s on them.