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Side-by-Side Bike Comparison · September 2026

Roadmaster Rex vs Runner F100-6A

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 F100-6A

Engine 100 cc

Power 6.97 bhp

Mileage 55 kmpl

Brakes / ABS No

Price in BD ৳95,000

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 F100-6A (Runner F100-6A)

The Performance Benchmark

Delivers class-leading punch with 6.97 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: 6.97 Bhp

Roadmaster Rex (Roadmaster Rex) 6 bhp @ 8000 rpm

Runner F100-6A (Runner F100-6A) 6.97 bhp @ 8000 rpm

Peak Torque Delivery (Nm) Top: 6.5 Nm

Roadmaster Rex (Roadmaster Rex) 0 Nm

Runner F100-6A (Runner F100-6A) 6.5 Nm @ 6500 rpm

Claimed Top Speeds

80 km/h

Roadmaster Rex (Roadmaster Rex)

80 km/h

Runner F100-6A (Runner F100-6A)

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)

8.5 / 10

Performance 9

Comfort 8.5

Tech & Features 6.8

Fuel Economy 9.5

Value for Money 8.8

RUNNER

Runner F100-6A (Runner F100-6A)

8.2 / 10

Performance 9.5

Comfort 6.7

Tech & Features 7.4

Fuel Economy 9.2

Value for Money 8.2

06 / Full Technical Comparison

Specification Sheet

Show Differences Only

Bike Information 11

Bike Name	Roadmaster Rex	Runner F100-6A
Brand	Roadmaster	Runner
CC	80	100
Regular Price	70900	95000
Bike Type	Commuter	Commuter
Distributor/Seller	Roadmaster Motors LTD	Runner Automobiles LTD (Bangladesh)
Model Year	N/A	N/A
Brand Origin	N/A	Bangladesh
Made In	N/A	Bangladesh
Assemble In	N/A	Bangladesh
Launched Date	N/A	N/A

Engine 15

Engine Type	4 – Stroke Single Cylinder	4‑Stroke, Single Cylinder, Air Cooled Petrol
Displacement	79	95.74
Maximum Power	6 Bhp @ 8000 RPM	6.97 Bhp @ 8000 RPM
Maximum Torque	0 NM @ 0 RPM	6.5 NM @ 6500 RPM
Bore	N/A	49.7mm
Stroke	N/A	49.35mm
Compression Ratio	N/A	8.8 : 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	900 ml (Without Filter)
Best Lube For	N/A	Mobil Super 4T 20W50

Transmission 4

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

Mileage & Top Speed 2

Mileage	60 Kmpl (Approx)	55 Kmpl (Approx)
Top Speed	80 Kmph (Approx)	80 Kmph (Approx)

Chassis & Suspension 3

Chassis Type	N/A	Backbone
Front Suspension	Telescopic	Hydraulic Telescopic
Rear Suspension	Twin-Spring loaded	Coil spring Hydraulic

Brakes 6

Front Brake Type	Single Disc	Drum Brake
Rear Brake Type	Drum Brake	Drum 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	Drum Brake

Wheels & Tyres 4

Front Tyre Size	2.50-17	2.50-18
Rear Tyre Size	2.75-17	2.75-18
Tyre Type	Tubetyre	Tubetyre
Wheel Type	Alloy	Alloy

Dimensions 8

Overall Length	1940 mm	1950 mm
Overall Width	800 mm	770 mm
Height	1300 mm	1250 mm
Ground Clearance	N/A	150 mm
Weight	88.8 Kg	96.2 Kg
Fuel Tank Capacity	9.5L	13 Liters
Wheelbase	1200 mm	1,250 mm
Seat Height	N/A	N/A

Electricals 5

Battery Type	MF	MF
Battery Voltage	12v	12V, 6.5Ah
Head Light	Halogen	35W/35W Halogen
Tail Light	Halogen	Halogen
Indicators	Halogen	Halogen

Features 8

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