Originally Posted by thedude007

Just to be clear, you're talking about bearing #2 in the attached pic.
This is for a 12R5.1 axle, would either of these work?
http://www.amainhobbies.com/product_...x3mm-Bearing-2

http://www.amainhobbies.com/product_...m-Ball-Bearing

The Associated bearing is .250"x.375"x.125"..so about 6.35mm x 9.5 mm x 3.175mm. The spur i'm using is: http://www.amainhobbies.com/product_...-Spur-Gear-72T

Thanks for helping the noob!!