Quote Originally Posted by EK Civic R View Post
Would there be a big difference between 18mm and 20mm??
You can't go wrong with either, really is driver/car dependant.
For the average driver, an 18mm will be sufficient.
For the more enthusiastic driver, who knows how to drive, a 20mm bar is a bit better.

As for "better driver" - if you don't know what lift off oversteer is, 18mm is fine for you. A 20mm bar will catch out the novice in a BAD way