The Basics of Rollers 【ミニ四駆】Tamiya Mini 4WD #7

This time I will share some stuff that I know about rollers in Mini 4WD. Bearing Rollers Weight: HG 19mm Aluminum Ball Race Rollers (Ringless) = 1.3 gram 19mm Aluminum Rollers w/ Plastic Ring (Aero Spoke) = 0.8 gram 19mm Aluminum Rollers w/ Plastic Ring (Dish Type) = 1.1 gram 19mm Aluminum Rollers w/ Plastic Ring (5 spoke) = 0.8 gram 19mm Aluminum Ball-Race Rollers (Aero Spoke-rubber rings) = 0.8 gram 19mm Aluminum Ball-Race Rollers (5 spoke-rubber ring) = 0.8 gram 17mm Aluminum Rollers w/ Plastic Ring = 0.8 gram 17mm Aluminum Ball-Race Rollers (3 spoke type-rubber rings) = 0.7 gram 13mm Aluminum Ball Race Rollers (Ringless) = 0.8 gram 13mm Guide Rollers Ball Bearing = 2.1 gram 13-12mm Double Aluminum Rollers = 1.4 gram 13-12mm Double Aluminum Rollers w/ Rubber Rings = 1.5 gram 11mm Guide Rollers Ball Bearing = 1.5 gram 9mm Guide Rollers Ball Bearing = 0.6 gram 9-8mm Double Aluminum Rollers = 0.6 gram