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All Bikes/Compare/Ktm Sx 125 vs Lem Lb50 R

Ktm Sx 125 vs Lem Lb50 R

Side-by-side comparison for used motorcycle buyers

Ktm Sx 125 vs Lem Lb50 R. Ktm Sx 125: ~34 hp @ 11,500 rpm (estimated for modern 2020+ era models) hp, ~98 kg (wet/curb weight, based on 2020+ models) weight, top speed ~110 km/h (estimated; top speed varies significantly based on gearing and track conditions), Motoryk rating 8.5/10. Lem Lb50 R: Estimated 6–8 hp @ 8,000–9,000 rpm (note: estimate; exact figures not widely published) hp, Estimated 45–55 kg (note: estimate for wet/curb weight; LEM bikes are known for very lightweight construction) weight, top speed Estimated 65–75 km/h (note: estimate; varies significantly based on gearing and track conditions), Motoryk rating 6.0/10.

Performance at a Glance

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

Ktm Sx 125 Lem Lb50 R
Horsepower (hp)
34 hp
6 hp
Torque (Nm)
25 Nm
6 Nm
Top Speed (km/h)
110 km/h
65 km/h
Weight (kg) — lower is better
98 kg
45 kg
Type
Motocross
Motocross
Horsepower
~34 hp @ 11,500 rpm (estimated for modern 2020+ era models)
Estimated 6–8 hp @ 8,000–9,000 rpm (note: estimate; exact figures not widely published)
Torque
~25 Nm @ 10,500 rpm (estimated)
Estimated 6–7 Nm @ 7,000 rpm (note: estimate; official figures not widely available)
Top Speed
~110 km/h (estimated; top speed varies significantly based on gearing and track conditions)
Estimated 65–75 km/h (note: estimate; varies significantly based on gearing and track conditions)
Weight
~98 kg (wet/curb weight, based on 2020+ models)
Estimated 45–55 kg (note: estimate for wet/curb weight; LEM bikes are known for very lightweight construction)
Fuel
Estimated 4–6 L/100km (note: varies greatly depending on riding intensity; two-stroke motocross bikes are not typically measured by standard fuel economy metrics)
Estimated 2.0–2.5 L/100km (note: estimate, as official figures are not widely published for this competition model)
Fairing
No
No

Individual Reviews

Ktm Sx 125
Ktm Sx 125
8.5/10

"An uncompromising race tool that rewards preparation and serious skill."

Pros
+Razor-sharp race chassis
+Exceptional power-to-weight ratio
+Premium WP suspension
Cons
High maintenance demands
Brutal, unforgiving powerband
Frequent top-end rebuilds
Lem Lb50 R
Lem Lb50 R
6.0/10

"Decent city runabout if history checks out, avoid mystery examples."

Pros
+Solid Italian frame quality
+Decent front disc brake
+Easy urban maneuverability
Cons
CVT variator wears quickly
Soft suspension disappoints
Restricted performance frustrates fast

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