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All Bikes/Compare/Suzuki Rmz450 vs Ktm Sx 450

Suzuki Rmz450 vs Ktm Sx 450

Side-by-side comparison for used motorcycle buyers

Suzuki Rmz450 vs Ktm Sx 450. Suzuki Rmz450: ~56 hp @ 9,000 rpm (estimate based on dyno testing of modern RM-Z450) hp, 111 kg (curb/wet weight — 2023 model) weight, top speed ~145 km/h (estimate; top speed is not a primary design focus for motocross bikes), Motoryk rating 7.5/10. Ktm Sx 450: ~63 hp @ 9,500 rpm (estimated for modern 2020+ generation) hp, ~106 kg (wet/curb weight, varies slightly by model year) weight, top speed ~145 km/h (estimated; note: motocross bikes are not optimized for top speed, this is an approximate real-world figure), Motoryk rating 8.5/10.

Performance at a Glance

Green = winner per metric · Bars are relative to the higher value

Suzuki Rmz450 Ktm Sx 450
Horsepower (hp)
56 hp
63 hp
Torque (Nm)
52 Nm
54 Nm
Top Speed (km/h)
145 km/h
145 km/h
Weight (kg) — lower is better
111 kg
106 kg
Type
Motocross
Motocross
Horsepower
~56 hp @ 9,000 rpm (estimate based on dyno testing of modern RM-Z450)
~63 hp @ 9,500 rpm (estimated for modern 2020+ generation)
Torque
~52 Nm @ 7,500 rpm (estimate)
~54 Nm @ 7,000 rpm (estimated for modern 2020+ generation)
Top Speed
~145 km/h (estimate; top speed is not a primary design focus for motocross bikes)
~145 km/h (estimated; note: motocross bikes are not optimized for top speed, this is an approximate real-world figure)
Weight
111 kg (curb/wet weight — 2023 model)
~106 kg (wet/curb weight, varies slightly by model year)
Fuel
~6.5 L/100km (estimate; varies greatly with riding intensity — motocross use is highly variable)
~7–9 L/100km (estimated; highly variable depending on riding intensity — note: motocross bikes are not typically measured by fuel economy)
Fairing
No
No

Individual Reviews

Suzuki Rmz450
Suzuki Rmz450
7.5/10

"Buy right and maintain it — ignore either and suffer."

Pros
+Sharp, confidence-inspiring handling
+Controllable power delivery
+Excellent suspension components
Cons
Brutal to neglected engines
Expensive valve maintenance intervals
Hard seat stock
Ktm Sx 450
Ktm Sx 450
8.5/10

"Extraordinary machine that ruthlessly punishes neglectful owners and rewards disciplined ones."

Pros
+Best-in-class power delivery
+Exceptional factory-grade suspension
+Lightweight chromoly frame
Cons
Brutal mandatory maintenance schedule
Unforgiving for intermediate riders
Expensive genuine KTM parts

Top 10 Accessories

Picks that work on either bike.

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Akrapovic Racing Line Full Exhaust KTM 450 SX-F
Akrapovič · Exhaust System
Akrapovic Racing Line Full Exhaust KTM 450 SX-F
View on Amazon →
Twin Air Foam Air Filter KTM 450 SX-F
Twin Air · Air Filter
Twin Air Foam Air Filter KTM 450 SX-F
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Acerbis X-Ultimate Handguards KTM Orange
Acerbis · Hand Guards
Acerbis X-Ultimate Handguards KTM Orange
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Renthal Ultralight Sprocket & Chain Kit KTM 450 SX
Renthal · Chain & Sprocket
Renthal Ultralight Sprocket & Chain Kit KTM 450 SX
View on Amazon →
Renthal Dual Compound Waffle Grips Motocross
Renthal · Grips
Renthal Dual Compound Waffle Grips Motocross
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Full-Face Motorcycle Helmet
Helmet
Full-Face Motorcycle Helmet
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Riding Gloves
Gloves
Riding Gloves
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Mesh Riding Jacket
Jacket
Mesh Riding Jacket
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Riding Boots
Boots
Riding Boots
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Chain Lube & Cleaner Kit
Chain Lube
Chain Lube & Cleaner Kit
View on Amazon →
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