QJMOTOR SRK 421 RR: The pound for pound supersport champion
High-revving four-cylinder soul, premium Italian hardware, and mecha-styling for just £5,299*
The QJMOTOR SRK 421 RR has officially arrived to shake up the mid-weight supersport category, blending aerodynamic engineering with high-speed styling.
The SRK 421 RR fuses a screaming four-cylinder soundtrack with precision control to deliver an unprecedented thrill for those chasing the ultimate ride.
- High-revving 421cc inline four-cylinder engine with 77.6ps and 39Nm of torque
- Original futuristic “Mecha” styling with aerodynamic winglets and ram-air intake
- Advanced rider interface: 7-inch TFT display, smartphone connectivity, and TPMS
- High-specification 176kg chassis with Brembo brakes, adjustable suspension
The heart of the SRK 421 RR is a 421cc inline four-cylinder, 16v DOHC engine producing 77.6ps (57kW) at 14,000rpm. Designed for linear and smooth power delivery, the engine is beginner-friendly while offering high-rev thrills for track-inspired performance. The engine delivers a peak torque of 39 Nm at 13,000 rpm. It still produces enough low-end urgency to ensure responsive delivery on city streets.
The engine also features DLC-treated valve tappets, an electroplated ceramic cylinder and a forged alloy steel camshaft.
The manufacturer also uses high-end components from famed Japanese companies. Including FCC paper-based clutch plates, NTN bearings, RIK piston rings, and Daido crankshaft bearings.
The SRK 421 RR has been crafted by the designers of some of the most acclaimed motorcycles. It features original mecha-inspired styling that creates a futuristic presence. Its aerodynamic bodywork includes bold lines, geometric cuts, and a hollowed tail section that channels airflow to reduce drag.
The aggressive front face is equipped with a Ram Air intake. This ensures efficient combustion and enhanced power output at speed.
Other distinctive styling touches include a three-dimensional floating taillight and a race-ready rider triangle created by lowered handlebars and raised footpegs. The 16-litre fuel tank is sculpted for ergonomic support. While the 808mm seat height ensures accessibility for a wide range of riders.
The steel-aluminium composite braided frame provides high-strength rigidity and has an evenly-balanced weight distribution for handling agility. This is paired with fully adjustable upside-down telescopic forks. As well as a rear multi-link shock absorber from Marzocchi.
Premium stopping power is provided by Brembo radial four-piston calipers acting on 300mm dual front discs and a two-piston caliper operating a 240mm single rear disc, supported by a dual-channel ABS system.
The rider interface is headlined by a 7-inch TFT display. Featuring a multi-language menu, smartphone connectivity, and navigation mirroring. Riders can toggle between Normal and Sport modes to adapt throttle response and the level of intervention from the Traction Control System (TCS) and ABS. Sport mode is designed for the track! Allowing slight rear wheel slip and wheelies.
Additional premium features include a Tyre Pressure Monitoring System (TPMS), an 18W dual-port USB (A&C) fast charger, and optional front and rear integrated cameras.
The QJMOTOR SRK 421 RR costs £5,299 (plus on the road charges) and is available in three colour options: Black, White or Red/Silver.
For more information and to find your nearest dealer, visit qjmotor.co.uk
QJMOTOR SRK 421 RR technical specifications
New price: £5,299 (+ OTR)
Capacity: 421cc
Bore x Stroke: 57.0mm × 41.2mm
Engine details: Inline four-cylinder, 16v, liquid-cooled, 4-stroke DOHC
Power: 57kW (77.6ps) @ 14,000rpm
Torque: 39.0 Nm @ 13,000rpm
Transmission: 6 speed, chain final drive
Fuel tank size: 16 litres
Technical features: 7″ TFT Dash, Traction Control (TCS), Smartphone Connectivity, TPMS, USB charger
Frame: High-Strength Steel-Aluminium Alloy Braided Frame
Front suspension: Marzocchi upside-down (USD) telescopic forks, fully adjustable
Rear suspension: Marzocchi Multi-link mono-shock, fully adjustable
Front brake: Dual 300mm discs, Brembo 4-piston calipers, ABS
Rear brake: Single 240mm disc, Brembo 1-piston caliper, ABS
Front wheel & tyre: 120/70 ZR17 CST High-Performance Sport
Rear wheel & tyre: 160/60 ZR17 CST High-Performance Sport
Dimensions: (LxWxH) 2020mm x 720mm x 1130mm
Wheelbase: 1375mm
Ground clearance: 150mm
Seat height: 808mm (kerb)
Weight: 176kg
Warranty: 2 years, unlimited mileage
Colours: Black, White, or Red/Silver
Contact: qjmotor.co.uk
QJMOTOR SRK 421 Highlights
– Brembo radial brakes with cornering ABS
– Switchable ride modes
– Adjustable Marzocchi suspension
– Marzocchi steering damper
– Quickshifter (up and down)
– Slipper clutch
– Tyre Pressure Monitoring System (TPMS)
– Switchable traction control system (TCS)
– Full LED lighting
– 7” TFT dashboard
– 18W dual-port USB (A&C) fast charger