DK Swift Mini BMX Race Bike-Black gear-size-45-7t The Tiagra BR-4770 is designed

The Tiagra BR-4770 is designed for flat mount installation and includes a fixing bolt for mount thickness of 25mm

The Avian BMX Disc Brake Rotor at J&R Bicycles were designed for BMX riding styles and crafted out of vented stainless steel to keep them lightweight

and heavy sessions

48oz/42g (full set of 6 - saves 27 grams from standard CrMo bolts)

Engineered with hollow pins and plates

DK Swift Mini BMX Race Bike-Black gear-size-45-7t The Tiagra BR-4770 is designedThe DK Swift Mini BMX Race Bike Black gives young riders a lightweight, confidence building start with race inspired design and dialed in sizing. Its 6061 aluminum frame is paired with proportionate bars, cranks, and gearing so everything feels balanced and easy to control. With alloy rims and Arisun XLR8 tires, the DK Swift Mini rolls smooth and fast, ready to hit the track or cruise around with ease. NOTE: As with any complete bike, J&R Bicycles