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Side-by-Side Bike Comparison · September 2026

Roadmaster Rex vs Runner Knight Rider V2

Technical comparison of performance curves, real-world dyno numbers, verified ratings, and full dynamic spec sheets.

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💎 Best Value

Roadmaster

Roadmaster Rex

Engine 80 cc

Power 6 bhp

Mileage 60 kmpl

Brakes / ABS N/A

Price in BD ৳70,900

Details

⚡ Power Leader

RUNNER

Runner Knight Rider V2

Engine 150 cc

Power 11.7 bhp

Mileage 40 kmpl

Brakes / ABS No

Switch Variant

Price in BD ৳167,000

Details

01 / Bottom-Line Takeaway

Quick Verdict

Editorial Positioning

VALUE CHAMPION #1

Roadmaster Rex (Roadmaster Rex)

The Value Argument

Maximizes features per taka spent at ৳70,900. Ideal balance of equipment and accessible dealer pricing without sacrificing daily road manners.

Best for: Budget-conscious riders looking for modern styling.

POWER & HARDWARE #2

Runner Knight Rider V2 (Runner Knight Rider V2)

The Performance Benchmark

Delivers class-leading punch with 11.7 bhp and sharp throttle response. Backed by No for riders demanding confidence in high-speed and emergency scenarios.

Best for: Highway tours, enthusiast riding, emergency brake safety.

02 / Engine Output Benchmarks

The Dyno Room

Peak Bhp & Torque Scaled

Peak Power Output (Bhp) Top: 11.7 Bhp

Roadmaster Rex (Roadmaster Rex) 6 bhp @ 8000 rpm

Runner Knight Rider V2 (Runner Knight Rider V2) 11.7 bhp @ 7500 rpm

Peak Torque Delivery (Nm) Top: 12.2 Nm

Roadmaster Rex (Roadmaster Rex) 0 Nm

Runner Knight Rider V2 (Runner Knight Rider V2) 12.2 Nm @ 5500 rpm

Claimed Top Speeds

80 km/h

Roadmaster Rex (Roadmaster Rex)

120 km/h

Runner Knight Rider V2 (Runner Knight Rider V2)

Dyno takeaway: Engine cooling hardware (liquid vs oil vs air) and gear ratios determine how long peak power can be sustained on open highway runs.

03 / Multi-Vector Scorecard

AI Analysis Engine

Rule-Based Specs Synthesizer

AI Engine Recommendation

Comparing power-to-weight, braking safety gear, real mileage data, and dealer price points across this matchup. Use the 5-point radar breakdown below to balance your budget against your daily riding style.

Roadmaster

Roadmaster Rex (Roadmaster Rex)

8.3 / 10

Performance 7.8

Comfort 8.5

Tech & Features 6.8

Fuel Economy 9.5

Value for Money 8.8

RUNNER

Runner Knight Rider V2 (Runner Knight Rider V2)

7.7 / 10

Performance 9.5

Comfort 6.9

Tech & Features 7.4

Fuel Economy 8.3

Value for Money 6.5

06 / Full Technical Comparison

Specification Sheet

Show Differences Only

Bike Information 11

Bike Name	Roadmaster Rex	Runner Knight Rider V2
Brand	Roadmaster	Runner
CC	80	150
Regular Price	70900	167000
Bike Type	Commuter	Standard
Distributor/Seller	Roadmaster Motors LTD	Runner Automobiles Limited
Model Year	N/A	2020
Brand Origin	N/A	Bangladesh
Made In	N/A	Bangladesh
Assemble In	N/A	Bangladesh
Launched Date	N/A	2020-12-06

Engine 15

Engine Type	4 – Stroke Single Cylinder	Vertical type, 4-stroke, CBF engine, chain transmission
Displacement	79	150
Maximum Power	6 Bhp @ 8000 RPM	11.7 Bhp @ 7500 RPM
Maximum Torque	0 NM @ 0 RPM	12.2 NM @ 5500 RPM
Bore	N/A	57.3 mm
Stroke	N/A	57.8 mm
Compression Ratio	N/A	9.1:1
Valves	N/A	2
Fuel Supply	Carburetor	Carburetor
No of Cylinders	1	1
Engine Cooling	Air Cooled	Air Cooled
Starting Method	Kick & Electric	Kick & Electric
Engine Oil Grade	N/A	20W50
Engine Oil Capacity	N/A	1 L (Without Filter)
Best Lube For	N/A	Mobil Super 4T 20W50

Transmission 4

Transmission Type	Manual	Manual
No of Gears	4	5
Clutch Type	Wet multi-disc clutc	Wet-multiplate
Drive Type	N/A	Chain Drive

Mileage & Top Speed 2

Mileage	60 Kmpl (Approx)	40 Kmpl (Approx)
Top Speed	80 Kmph (Approx)	120 Kmph (Approx)

Chassis & Suspension 3

Chassis Type	N/A	Double Cradle
Front Suspension	Telescopic	Telescopic
Rear Suspension	Twin-Spring loaded	Monoshock

Brakes 6

Front Brake Type	Single Disc	Single Disc
Rear Brake Type	Drum Brake	Disc Brake
Front Brake Diameter	N/A	N/A
Rear Brake Diameter	N/A	N/A
Anti-Lock Braking System (ABS)	N/A	No
Braking System	N/A	Disc Braking System

Wheels & Tyres 4

Front Tyre Size	2.50-17	80/100 - 17
Rear Tyre Size	2.75-17	110/80× 17
Tyre Type	Tubetyre	Tubeless
Wheel Type	Alloy	Alloy

Dimensions 8

Overall Length	1940 mm	2025 mm
Overall Width	800 mm	740 mm
Height	1300 mm	1065 mm
Ground Clearance	N/A	160 mm
Weight	88.8 Kg	143 kg
Fuel Tank Capacity	9.5L	16.8 Liters
Wheelbase	1200 mm	1335 mm
Seat Height	N/A	800 mm

Electricals 5

Battery Type	MF	MF
Battery Voltage	12v	12V
Head Light	Halogen	35W/35W Halogen
Tail Light	Halogen	Halogen
Indicators	Halogen	Halogen

Features 8

Speedometer	Analog	Digital
Odometer	Analog	Digital
RPM Meter	Digital	Digital
Handle Type	Pipe handle bar	Pipe handle bar
Seat Type	Single-Seat	Split-Seat
Passenger Grab Rail	Yes	Yes
Engine Kill Switch	No	Yes
Additional Feature	N/A	N/A