Mafiabikes BlackJack D 26-inch dirt-jump bike — a complete setup for your first dirt sessions:

Key features

• Suggested rider height: Approx. 150–190 cm
• Wheel size: 26 in
• Fork: RST Dirt R, coil spring and oil, 100 mm travel
• Bar: Aluminium, 50 mm rise, 737 mm width, 31.8 mm clamp
• Cranks: Three-piece chromoly, 170 mm
• Weight: 13.6 kg

Looking for a first dirt-jump bike? The BlackJack D combines 26-inch wheels with a 100 mm suspension fork and a single-speed 25T/10T drivetrain. A rear Zoom hydraulic disc brake gives you a way to manage speed between features.

A complete starting setup

Three-piece chromoly cranks turn in a cartridge-bearing Mid bottom bracket, while double-wall aluminium rims form the wheel build. The tyres differ front and rear: a Lagos Snakeskin 2 26 x 2.5-inch front and a Kenda 26 x 2.30-inch rear.

The 737 mm-wide aluminium bar has 50 mm of rise. A short forged stem and integrated headset complete the steering setup. Check the brake hose routing and available movement before attempting barspins.

Check the fit and fork setup

The suggested rider height is around 150–190 cm. This is a broad starting range, so compare the 570 mm top tube, 396 mm chainstays and bar dimensions with your proportions and preferred riding position. Follow the RST fork instructions for setup and servicing.

Before your first ride

The bike is supplied around 90% assembled. Fit the pedals, handlebars and any other supplied parts, including the front wheel where required, then check the complete bike before riding. Have the assembly and initial inspection carried out by a professional bike workshop. This is an additional paid service; read the warranty supplied with the bike and keep the service receipt and any required confirmation.

Checks for dirt-jump riding

Jumps, impacts and landings put high loads through the frame, fork, wheels and other components. No dirt-jump bike is indestructible. Check for loose fittings, cracks, damage and worn parts before every ride, and stop riding if anything is loose or damaged. Follow the bike and component manufacturers’ maintenance intervals.

Wear a suitable helmet and protective gear. Start with features suited to your ability and stay within the bike’s intended use. For assembly and servicing guidance, read our important information before buying and using a bike. Your statutory consumer rights remain separate from the manufacturer’s warranty.

Mafiabikes BlackJack D 26-inch dirt-jump bike — specifications:

Sizing, weight and other details:

• Suggested rider height: Approx. 150–190 cm
• Wheel size: 26 in
• Weight: 13.6 kg
• Rider level: Beginner

Fork:

• Fork: RST Dirt R, coil spring and oil, 100 mm travel

Handlebars:

• Bar: Aluminium, 50 mm rise, 737 mm width, 31.8 mm clamp

Cranks:

• Cranks: Three-piece chromoly, 170 mm

Frame:

• Frame: Integrated seat clamp; CNC-machined head tube; top tube and down tube gussets

Frame geometry:

• Top tube length (TT / A): 570 mm
• Chainstay length (CS / B): 396 mm
• Head tube angle (HA / C): 69°
• Seat tube angle (SA / D): 71°
• Bottom bracket height (BB / E): 315 mm
• Seat tube height (F, bottom bracket centre to top of seat tube): 279 mm

Stem:

• Stem: Mafiabikes, forged aluminium, short reach

Headset:

• Headset: Integrated, cartridge bearings

Wheels and rims:

• Rims: 26 in, aluminium, double wall

Tyres:

• Front tyre: Lagos Snakeskin 2, 26 x 2.5 in
• Rear tyre: Kenda, 26 x 2.30 in, 58-559; 30–80 PSI / 2.0–5.6 bar / 200–560 kPa

Bottom bracket:

• Bottom bracket: Mid BB, cartridge bearings

Chainring or sprocket:

• Sprocket: Mafiabikes, 25T

Front hub:

• Front hub: Aluminium, 10 mm chromoly axle, 36H

Rear hub and driver:

• Rear hub: Cassette, 10 mm chromoly axle, sealed cartridge bearings, 36H, 10T driver

Brakes and controls:

• Rear brake: Zoom hydraulic disc brake, 160 mm rotor

Saddle and seatpost:

• Saddle: Mafiabikes, one-piece Combo, vinyl cover

Pedals:

• Pedals: Mafiabikes, 9/16 in thread

Grips and bar ends:

• Grips: Lucky 6