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Side-by-Side Bike Comparison · September 2026

Roadmaster Rex vs Yamaha Fzs V4

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

Yamaha

Yamaha Fzs V4

Engine 150 cc

Power 12.23 bhp

Mileage 45 kmpl

Brakes / ABS Single-Channel

Price in BD ৳296,500

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

Yamaha Fzs V4 ( Yamaha Fzs V4)

The Performance Benchmark

Delivers class-leading punch with 12.23 bhp and sharp throttle response. Backed by Single-Channel 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: 12.23 Bhp

Roadmaster Rex (Roadmaster Rex) 6 bhp @ 8000 rpm

Yamaha Fzs V4 ( Yamaha Fzs V4) 12.23 bhp @ 7250 rpm

Peak Torque Delivery (Nm) Top: 13.3 Nm

Roadmaster Rex (Roadmaster Rex) 0 Nm

Yamaha Fzs V4 ( Yamaha Fzs V4) 13.3 Nm @ 5500 rpm

Claimed Top Speeds

80 km/h

Roadmaster Rex (Roadmaster Rex)

120 km/h

Yamaha Fzs V4 ( Yamaha Fzs V4)

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 7.7

Comfort 8.5

Tech & Features 6.8

Fuel Economy 9.5

Value for Money 8.8

Yamaha

Yamaha Fzs V4 ( Yamaha Fzs V4)

7.8 / 10

Performance 9.5

Comfort 6.8

Tech & Features 7.4

Fuel Economy 8.6

Value for Money 6.5

06 / Full Technical Comparison

Specification Sheet

Show Differences Only

Bike Information 11

Bike Name	Roadmaster Rex	Yamaha Fzs V4
Brand	Roadmaster	Yamaha
CC	80	150
Regular Price	70900	296500
Bike Type	Commuter	Standard
Distributor/Seller	Roadmaster Motors LTD	ACI Motors Limited
Model Year	N/A	2024
Brand Origin	N/A	Japan
Made In	N/A	India
Assemble In	N/A	India
Launched Date	N/A	2024-09-28

Engine 15

Engine Type	4 – Stroke Single Cylinder	4-stroke, SOHC, 2-valve, BS6 Phase 2
Displacement	79	149
Maximum Power	6 Bhp @ 8000 RPM	12.23 Bhp @ 7250 RPM
Maximum Torque	0 NM @ 0 RPM	13.3 NM @ 5500 RPM
Bore	N/A	57.3 mm
Stroke	N/A	57.9 mm
Compression Ratio	N/A	9.6:1
Valves	N/A	2
Fuel Supply	Carburetor	Fuel injection
No of Cylinders	1	1
Engine Cooling	Air Cooled	Air Cooled
Starting Method	Kick & Electric	Electric
Engine Oil Grade	N/A	10W40
Engine Oil Capacity	N/A	1 L (Without Filter)
Best Lube For	N/A	Mobil Racing 4T 10W40

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)	45 Kmpl (Approx)
Top Speed	80 Kmph (Approx)	120 Kmph (Approx)

Chassis & Suspension 3

Chassis Type	N/A	Diamond
Front Suspension	Telescopic	Telescopic fork
Rear Suspension	Twin-Spring loaded	7-Step Adjustable Monocross Suspension

Brakes 6

Front Brake Type	Single Disc	Single Disc
Rear Brake Type	Drum Brake	Disc Brake
Front Brake Diameter	N/A	282 mm
Rear Brake Diameter	N/A	220 mm
Anti-Lock Braking System (ABS)	N/A	Single-Channel
Braking System	N/A	Single Channel ABS

Wheels & Tyres 4

Front Tyre Size	2.50-17	100/80-17M/C
Rear Tyre Size	2.75-17	140/60 R17M/C
Tyre Type	Tubetyre	Tubeless
Wheel Type	Alloy	Alloy

Dimensions 8

Overall Length	1940 mm	1990 Mm
Overall Width	800 mm	780 Mm
Height	1300 mm	1080 Mm
Ground Clearance	N/A	165 Mm
Weight	88.8 Kg	135 Kg
Fuel Tank Capacity	9.5L	13L
Wheelbase	1200 mm	1330 Mm
Seat Height	N/A	790 Mm

Electricals 5

Battery Type	MF	mf
Battery Voltage	12v	12V 4Ah
Head Light	Halogen	LED
Tail Light	Halogen	LED
Indicators	Halogen	LED

Features 8

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