I have just had it done, after reading Russ Barnes' recommendations. I simply ordered a set of rear wheels, tires and rims. There was some resistance while at the dealership ("It doesn't fit, the front tires are smaller than the back", my reply, "I know for a fact they fit and that is why I ordered them.").
I immediately felt the improvement in the handling, changing lanes at high speed, and with each sharp curve and even when traveling behind a large truck (much less squirliness). I'm looking forward to a windy day to see how much the lateral wind problem is descreased.
I'm going to go ahead and order the special bag to hold one of the old front tires and use it as a spare.
I was sure to adjust my headlights down.
I would recommend this change to anyone who would like to improve the handling of their smart car. The lower (1 mpg) gas mileage is well worth it. The advantage of having a spare and a better looking car is well worth the extra cost. A hidden, but small advantage: the odometer reading will be slightly lower over the long haul.
Any questions, email me at email@example.com
Smartnaz, you ask; "Can you tell me how much the dealer charged you for the rear rims?" If you are truly considering that route you are going to get gauged out of a good lump of money. Either buy a used pair from one of the smarts on the forums (451.com, smartcarofamerica.com, or here) or if you dont trust that route go to smartmadness.com as they are a good retailer of all smart stuff.
Anyone have a set of good rear tires and wheels for a 08 Cabrio they would like to sell? Erv
I believe the wider rear tires and narrower front tires is a better setup for specifically the smart car, versus matching width at all four wheels. The handling is more accurate and high speed side to side maneuvers are slightly more composed with narrower fronts.
I have matching Brabus rims at all 4 corners right now and it's the first thing I noticed when I made the change and ditched the stock Pure rims.
The difference is not big enough IMO to merit worrying about it. You could probably get 50 professionals on a track test running the car and there will be different opinions about the section width choices.