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Side-by-Side Bike Comparison · September 2026

Roadmaster Rex vs Yamaha FZS V2 (FI Double Disc)

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 V2 (FI Double Disc)

Engine 150 cc

Power 13 bhp

Mileage 40 kmpl

Brakes / ABS No

Price in BD ৳236,500

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 V2 (FI Double Disc) ( Yamaha FZS V2 (FI Double Disc))

The Performance Benchmark

Delivers class-leading punch with 13 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: 13 Bhp

Roadmaster Rex (Roadmaster Rex) 6 bhp @ 8000 rpm

Yamaha FZS V2 (FI Double Disc) ( Yamaha FZS V2 (FI Double Disc)) 13 bhp @ 8000 rpm

Peak Torque Delivery (Nm) Top: 12.8 Nm

Roadmaster Rex (Roadmaster Rex) 0 Nm

Yamaha FZS V2 (FI Double Disc) ( Yamaha FZS V2 (FI Double Disc)) 12.8 Nm @ 6000 rpm

Claimed Top Speeds

80 km/h

Roadmaster Rex (Roadmaster Rex)

120 km/h

Yamaha FZS V2 (FI Double Disc) ( Yamaha FZS V2 (FI Double Disc))

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)

8.2 / 10

Performance 7.6

Comfort 8.5

Tech & Features 6.8

Fuel Economy 9.5

Value for Money 8.8

Yamaha

Yamaha FZS V2 (FI Double Disc) ( Yamaha FZS V2 (FI Double Disc))

7.7 / 10

Performance 9.5

Comfort 6.6

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	Yamaha FZS V2 (FI Double Disc)
Brand	Roadmaster	Yamaha
CC	80	150
Regular Price	70900	236500
Bike Type	Commuter	Standard
Distributor/Seller	Roadmaster Motors LTD	ACI Motors Limited
Model Year	N/A	2018
Brand Origin	N/A	Japan
Made In	N/A	India
Assemble In	N/A	Bangladesh
Launched Date	N/A	2018-05-14

Engine 15

Engine Type	4 – Stroke Single Cylinder	Air cooled, 4 stroke, SI engine, SOHC
Displacement	79	149
Maximum Power	6 Bhp @ 8000 RPM	13 Bhp @ 8000 RPM
Maximum Torque	0 NM @ 0 RPM	12.8 NM @ 6000 RPM
Bore	N/A	57.3 mm
Stroke	N/A	57.9 mm
Compression Ratio	N/A	9.5:1
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 Multiple-disc
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	Diamond Frame
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	No
Braking System	N/A	Double Disc

Wheels & Tyres 4

Front Tyre Size	2.50-17	100/80-17M/C (52P)NYLOGRIP ZAPPER-FX1
Rear Tyre Size	2.75-17	140/60-R17M/C (63P)revz-Y
Tyre Type	Tubetyre	Tubeless
Wheel Type	Alloy	Alloy

Dimensions 8

Overall Length	1940 mm	2060 Mm
Overall Width	800 mm	770 Mm
Height	1300 mm	1050 Mm
Ground Clearance	N/A	160 Mm
Weight	88.8 Kg	133 KG
Fuel Tank Capacity	9.5L	12L
Wheelbase	1200 mm	1330 Mm
Seat Height	N/A	790 Mm

Electricals 5

Battery Type	MF	mf
Battery Voltage	12v	12V,4.0Ah(10HR)
Head Light	Halogen	12V 35/35W (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