Mafiabikes SuperKush 20-inch BMX bike, 21-inch TT — more room for taller freestyle riders:

Key features

• Suggested rider height: Approx. 175 cm and taller
• Top tube length (TT / A): 21 in
• Wheel size: 20 x 2.4 in
• Bar: Height (G): 9 in; width (H): 29.5 in
• Cranks: Three-piece 4130 chromoly, 175 mm
• Weight: 11.79 kg
• Rider level: Intermediate

The Mafiabikes SuperKush gives taller riders a 21-inch top tube and a complete setup for developing their freestyle riding. The bars and fork are 4130 chromoly, with the same material used in the frame’s down tube and chainstays. The frame combines those tubes with 1020 Hi-Ten steel.

More room for your stance

The frame size is 21 inches TT, meaning top tube length; the wheels are 20 inches. The suggested rider height is approximately 175 cm and taller. Use that as a starting point, then compare the geometry with your body proportions and a bike you already ride. The 9-inch bar rise and 29.5-inch width also affect your position.

Less exposed hardware at the hubs

Both hubs use female axles and sealed cartridge bearings. The female layout uses bolts at the dropouts, while the sealed bearings help keep contamination away from the bearing surfaces. Double-wall aluminium rims complete the wheels, with 20 x 2.4-inch LAGOS Crawler tyres.

The drivetrain pairs 175 mm three-piece 4130 chromoly cranks with a CNC-machined 7075 aluminium Gully sprocket. A 25T sprocket and 9T cassette driver give you a conventional freestyle drivetrain. The U-brake lets you manage speed as you set up for the next feature.

Mafiabikes SuperKush 20-inch BMX bike, 21-inch TT — specifications:

Sizing, weight and other details:

• Suggested rider height: Approx. 175 cm and taller
• Wheel size: 20 x 2.4 in
• Weight: 11.79 kg
• Rider level: Intermediate

Frame geometry:

• Top tube length (TT / A): 21 in
• Chainstay length (CS / B): 13.25 in
• Head tube angle (HA / C): 75°
• Seat tube angle (SA / D): 70°
• Bottom bracket height (BB / E): 11.75 in
• Seat tube height (F, bottom bracket centre to top of seat tube): 8.5 in

Handlebars:

• Bar: Height (G): 9 in; width (H): 29.5 in
• Handlebar material: 4130 chromoly

Cranks:

• Cranks: Three-piece 4130 chromoly, 175 mm

Frame:

• Frame material: 4130 chromoly down tube (DT) and chainstays (CS); 1020 Hi-Ten steel
• Frame details: CNC-machined head tube, gyro-ready; top tube and down tube gussets; tapered rear triangle; integrated seat clamp; forged rear triangle bridge

Fork:

• Fork: 4130 chromoly; tapered legs; threaded; aluminium top cap; 30 mm offset; peg-ready

Stem:

• Stem: Mafiabikes aluminium, top load

Wheels and rims:

• Rims: Aluminium, double wall, 36H

Tyres:

• Tyres: LAGOS Crawler, 20 x 2.4 in

Headset:

• Headset: Integrated

Bottom bracket:

• Bottom bracket: Mid BB, sealed cartridge bearings, 19 mm

Chainring or sprocket:

• Sprocket: Mafiabikes Gully, CNC-machined 7075 aluminium, 25T

Front hub:

• Front hub: Aluminium, 36H; female 4130 chromoly axle; sealed cartridge bearings

Rear hub and driver:

• Rear hub: Aluminium cassette hub, 36H; female 4130 chromoly axle; sealed cartridge bearings; 9T driver

Brakes and controls:

• Brake: U-brake

Saddle and seatpost:

• Saddle: Combo, integrated aluminium seatpost

Pedals:

• Pedals: Mafiabikes nylon, 9/16 in

Grips and bar ends:

• Grips: Lucky 6

Chain:

• Chain: KMC

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.

Frame geometry diagram

Use the letters in the specification to identify each measurement. TT is top tube length, CS is chainstay length, HA is head tube angle, SA is seat tube angle, BB is bottom bracket height and F is measured from the bottom bracket centre to the top of the seat tube. On the handlebar drawing, G marks bar rise and H marks bar width.