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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