FitBikeCo. PRK MD 20-inch BMX bike — a gyro setup for bar rotations in the skatepark:

Key features

• Suggested rider height: Approx. 160–175 cm
• Top tube length (TT): 20.5 in
• Wheel size: 20 in
• Tyres: Fit OEM, 20 x 2.4 in
• Bar: Two-piece, 8.7 in rise, 29 in width
• Cranks: Three-piece tubular chromoly, 165 mm
• Brake system: U-brake with gyro
• Weight: Approx. 12.42 kg
• Rider level: Intermediate

Turn the bars without winding up the brake cables

The PRK has a gyro paired with its U-brake. The gyro lets the bars rotate without winding the brake cables around the head tube, so the brake setup can stay connected during barspins. Have the cables and gyro adjusted correctly and check the brake before every session.

Compare the frame size and geometry

This MD has a 20.5-inch top tube, 12.6-inch chainstays and a 75.3° head tube angle. Compare those measurements with a bike you know. The XS has a 20-inch top tube and the MD a 20.5-inch top tube; both use 20-inch wheels.

The suggested rider height is around 160–175 cm. Treat it as a guide and check reach and frame clearance. The 7.25-inch standover figure is shown along the seat tube on the geometry diagram; it is not the clearance from the ground.

A simple cassette drivetrain

The 25T Fit Key sprocket and 9T cassette driver give you a single-speed setup. A cassette requires back-pedalling when you roll backwards. The build includes 165 mm three-piece tubular chromoly cranks and a sealed Mid bottom bracket.

The two-piece bar measures 29 inches wide with an 8.7-inch rise. A chromoly front triangle, Fit OEM 20 x 2.4-inch tyres, Fit PC pedals and flanged Fit Savage grips complete the listed park setup.

Check the setup before practising

Inspect the frame, fork, wheels, crankset, pedals, brake and fixings before riding. Start with features suited to your ability and stay within the bike’s intended use. Stop riding if you find damage or play, and have it checked before continuing.

FitBikeCo. PRK MD 20-inch BMX bike — specifications:

Sizing, weight and other details:

• Suggested rider height: Approx. 160–175 cm
• Wheel size: 20 in
• Weight: Approx. 12.42 kg
• Rider level: Intermediate

Frame geometry:

• Top tube length (TT): 20.5 in
• Chainstay length (CS): 12.6 in
• Head tube angle (HA): 75.3°
• Seat tube angle (SA): 71°
• Bottom bracket height (BB): 11.6 in
• Standover (SO, as shown on the geometry diagram): 7.25 in

Tyres:

• Tyres: Fit OEM, 20 x 2.4 in

Handlebars:

• Bar: Two-piece, 8.7 in rise, 29 in width

Cranks:

• Cranks: Three-piece tubular chromoly, 165 mm

Brakes and controls:

• Brake system: U-brake with gyro
• Brake details: U-brake with increased tyre clearance, softer spring action, gyro

Frame:

• Frame: Chromoly front triangle, park geometry

Fork:

• Fork: Tapered legs, 25 mm offset

Stem:

• Stem: Fit, top load

Headset:

• Headset: Integrated

Wheels and rims:

• Wheels: Fit S1W, 20 in

Front hub:

• Front hub: Sealed bearings

Rear hub and driver:

• Rear hub: Sealed cassette hub, 9T driver

Bottom bracket:

• Bottom bracket: Sealed Mid BB

Chainring or sprocket:

• Sprocket: Fit Key, 25T

Drivetrain:

• Drivetrain: 25T / 9T cassette

Saddle and seatpost:

• Saddle and seatpost: Fit integrated four-panel seat/post

Pedals:

• Pedals: Fit PC

Grips and bar ends:

• Grips: Fit Savage, flanged

Safety while riding

Freestyle BMX riding puts high loads through the bike during tricks, jumps and landings. No bike is indestructible: parts can wear out or become damaged. Check the frame, fork, bars, wheels, axles, cranks, pedals, brakes and bolted connections before every ride. Inspect the bike after a hard impact and stop riding if you find looseness, cracks or damage. Have any problem checked and repaired before riding again.

Wear a properly fitted helmet and suitable protective pads. Read our important information before buying and riding a BMX bike for assembly, servicing and riding checks.

Important information about your new bike

• Read the instructions and warranty supplied with the bike before riding.
• The bike is delivered approximately 90% assembled for shipping.
• Before the first ride, fit the pedals, saddle and handlebars, and the front wheel where required. Follow the assembly instructions and check all components.
• Have a professional bike workshop carry out a pre-ride inspection. This is a paid service; keep the receipt as proof for the manufacturer’s warranty and follow the warranty terms supplied with your bike.

The manufacturer’s warranty is separate from your statutory consumer rights. Continue to inspect and service the bike throughout its use.