Difference is 10mm.
200mm bodies give more drag as the air gets between the wheels and the body easier than on 190mm.
Plus they look terrible (200mm on a 190mm chassis).
Quote, Leodis, 2007: ''I've been shopping online for 9 years and the only charge I've ever had to dispute with my credit card company was from TiR. Congratulations TiR. Even porn sites are more ethical than your company!''
RC cars - I haz sum.