Promax RMV 20" 36H Rear Rim - Blue - Tubeless Ready 9" They also have unique undercut

They also have unique undercut pads that give a slim comfortable feel with the ultimate amount of grip

Color: Ball Burnished Aluminum (silver)

5 x 9 inches)

the axle is 3/8" and is 165mm long

Promax RMV 20" 36H Rear Rim - Blue - Tubeless Ready 9" They also have unique undercutThis is a 20" rear specific Promax rim in Blue. This BMX tubeless ready rim design focused on reducing weight while building it for strength and speed. Thicker inner rim wall and sleeved joint to allow a tighter and stronger built wheel Reduced weight by using simple design and 6061 T6 Aluminum Alloy Certified tubeless. Tubed and tubeless tire compatible Intended for rim brake use For tubeless rim set up, use Tubeless Tape 25mm 2 layers, Tubeless