Mario Kart's 3DS customisation whilst easy to use, comes with a fair bit of depth. Maximise your potential with a nifty phone app.
Racing along with the sun shining, birds tweeting and your cast of Mii waving in the background, 1st place crown firmly on your head. Joy! When a better configured kart comes past at lightening speed, it might be time to improve those stats.
Trail and error is all in good fun, but to save a bit of time a group of fans have put together Combo Explorer - an app for your iOS or Android mobile that effectively lets you string together the best combinations for your characters.
Alternatively A Wiki guide also does a similar job of comparing parts.
What selection do you use in Mario Kart 7 Speed, acceleration, weight, handling - what do you prefer?