You could fit 14" diameter rear rims with 185/65R14 rear tires. However, no one makes 14" rims for the 3 bolt hole Smarts so you would need 3 to 5 bolt hole adapters. Then you could fit 14" steel rims 5J x 14 ET50 from a Mercedes 190 (a 1990's car). Don't try fitting 14" rims to the front of a Smart ForTwo as the rims won't clear the front brake calipers. 30mm thick adapters would adjust the 50mm offset of these rims to a 20mm offset which is close to the 22mm offset of the standard rear rims on the Smart 451. You could then fit 165/65R15 front tires to the standard Smart 451 front rims. The outside diameter of both these tire sizes is almost identical, so you wouldn't have any problems with the ESP (ie. the car's electronics). You might not be able to get good quality matching tires in these sizes. In Europe, you can get matching Vredestein Quatrac 5 tires in these sizes but availability in the US is different.If cost is not a factor, what is the absolute best tire you would choose for the absolutely smoothest ride possible? (2014 Passion Coupe)
You can get a big improvement in ride comfort even if you stick to the standard 175/55R15 rear tire size. Because the driver of a Smart ForTwo sits much nearer to the rear axle than the front axle, the changes to the rear tires will have a bigger effect to ride comfort than changes to the front tires.There is no such thing, as a smooth ride. On ant smart car. “Any tire”. The vehicle has a very short wheel base. Very little rebound, after any bump, rough texture road etc. Nature of the beast. Just stick with the OEM tires recommenced sizes.