20x1.90" Box Two BMX Tire - Black BMX - Race The crank arms spin on

The crank arms spin on a beefy 24-millimeter spindle permanently fitted into the drive-side arm

and the bearings are loose ball

Knurl-lock™ washer system

This is one (1) 26 x 1-3/4 Kenda S-7 Tire

20x1.90" Box Two BMX Tire - Black BMX - Race The crank arms spin onThe Box Two Wire Bead Tire was engineered with a minimalist approach to hit lofty goals for weight, traction, rolling resistance, and rebound. At its heart is a super supple 60TPI casing with as much rubber displacing nylon as possible. Box also employed skin walls to reduce drag and further reduce weight, then flanked the high density casing with a tightly packed hoop of aramid fibers. Finally, all of this is draped with a BMX race specific tread