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Side-by-Side Bike Comparison · September 2026

GPX Demon GR250R vs Roadmaster Rapido

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

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⚡ Power Leader

GPX

GPX Demon GR250R

Engine 250 cc

Power 29 bhp

Mileage 30 kmpl

Brakes / ABS Dual-Channel

Price in BD ৳414,990

Details

💎 Best Value

Roadmaster

Roadmaster Rapido

Engine 150 cc

Power 13.6 bhp

Mileage 35 kmpl

Brakes / ABS No

Price in BD ৳135,900

Details

01 / Bottom-Line Takeaway

Quick Verdict

Editorial Positioning

POWER & HARDWARE #1

GPX Demon GR250R (GPX Demon GR250R)

The Performance Benchmark

Delivers class-leading punch with 29 bhp and sharp throttle response. Backed by Dual-Channel for riders demanding confidence in high-speed and emergency scenarios.

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

VALUE CHAMPION #2

Roadmaster Rapido (Roadmaster Rapido)

The Value Argument

Maximizes features per taka spent at ৳135,900. Ideal balance of equipment and accessible dealer pricing without sacrificing daily road manners.

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

02 / Engine Output Benchmarks

The Dyno Room

Peak Bhp & Torque Scaled

Peak Power Output (Bhp) Top: 29 Bhp

GPX Demon GR250R (GPX Demon GR250R) 29 bhp @ 9500 rpm

Roadmaster Rapido (Roadmaster Rapido) 13.6 bhp @ 8500 rpm

Peak Torque Delivery (Nm) Top: 23 Nm

GPX Demon GR250R (GPX Demon GR250R) 23 Nm @ 7500 rpm

Roadmaster Rapido (Roadmaster Rapido) 12.2 Nm @ 6000 rpm

Claimed Top Speeds

135 km/h

GPX Demon GR250R (GPX Demon GR250R)

120 km/h

Roadmaster Rapido (Roadmaster Rapido)

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.

GPX

GPX Demon GR250R (GPX Demon GR250R)

7.8 / 10

Performance 9.5

Comfort 6.7

Tech & Features 7.4

Fuel Economy 9

Value for Money 6.5

Roadmaster

Roadmaster Rapido (Roadmaster Rapido)

8.2 / 10

Performance 7.6

Comfort 7.5

Tech & Features 7.4

Fuel Economy 9.5

Value for Money 8.8

06 / Full Technical Comparison

Specification Sheet

Show Differences Only

Bike Information 11

Bike Name	GPX Demon GR250R	Roadmaster Rapido
Brand	GPX	Roadmaster
CC	250	150
Regular Price	414990	135900
Bike Type	Sports	Naked Sports
Distributor/Seller	Speedoz Limited	Roadmaster Motors LTD
Model Year	2025	N/A
Brand Origin	Thailand	N/A
Made In	China	N/A
Assemble In	Bangladesh	N/A
Launched Date	2025-08-31	N/A

Engine 15

Engine Type	Hyper Quadra, SOHC, 4 valve Liquid-cooled	4 – Stroke Single Cylinder
Displacement	249.6	150
Maximum Power	29 Bhp @ 9500 RPM	13.6 Bhp @ 8500 RPM
Maximum Torque	23 NM @ 7500 RPM	12.2 NM @ 6000 RPM
Bore	77 mm	N/A
Stroke	4	N/A
Compression Ratio	N/A	N/A
Valves	4	N/A
Fuel Supply	Fuel Injection	Carburetor
No of Cylinders	1	1
Engine Cooling	Liquid Cooled	Air Cooled
Starting Method	Electric	Kick & Electric
Engine Oil Grade	10W-40	N/A
Engine Oil Capacity	1.2 L(Without Filter)	N/A
Best Lube For	Mobil Racing 4T 10W40	N/A

Transmission 4

Transmission Type	Manual	Manual
No of Gears	6	5
Clutch Type	Wet-multiplate	Wet Multiple-disc
Drive Type	Chain Drive	N/A

Mileage & Top Speed 2

Mileage	30 Kmpl (Approx)	35 Kmpl (Approx)
Top Speed	135 Kmph (Approx)	120 Kmph (Approx)

Chassis & Suspension 3

Chassis Type	Trellis Frame	N/A
Front Suspension	Upside Down Forks	Inverted Telescopic Fork
Rear Suspension	Mono 7-Step Adjustable Monoshoc	Monoshock

Brakes 6

Front Brake Type	Single Disc	Single Disc
Rear Brake Type	Disc Brake	Disc Brake
Front Brake Diameter	276 mm	240 mm
Rear Brake Diameter	220 mm	220 mm
Anti-Lock Braking System (ABS)	Dual-Channel	No
Braking System	Dual Channel ABS	CBS Braking

Wheels & Tyres 4

Front Tyre Size	110/70-17	110/60-17
Rear Tyre Size	150/60-R17	130/60-17
Tyre Type	Tubeless	Tubeless
Wheel Type	Alloy	Alloy

Dimensions 8

Overall Length	2020 Mm	2050 mm
Overall Width	747 Mm	830 mm
Height	1145 Mm	1290 mm
Ground Clearance	159 Mm	170 mm
Weight	158 kg	138 Kg
Fuel Tank Capacity	11 L	12L
Wheelbase	1,350 Mm	1330 mm
Seat Height	815 Mm	N/A

Electricals 5

Battery Type	MF	MF
Battery Voltage	12V 6Ah	12v
Head Light	LED	LED
Tail Light	LED	LED
Indicators	LED	LED

Features 8

Speedometer	Digital	Digital
Odometer	Digital	Digital
RPM Meter	Digital	Digital
Handle Type	Pipe handle bar	Pipe handle bar
Seat Type	Split-Seat	Single-Seat
Passenger Grab Rail	Yes	Yes
Engine Kill Switch	Yes	Yes
Additional Feature	TCS (Traction Control System), Digital (TFT Display With Bluetooth Connectivily)	N/A