GAS GAS SM 50 - 2004 Specifications and Reviews

The 2004 GAS GAS SM 50 is a lightweight supermotard designed for riders seeking nimble urban agility and dirt-to-street versatility. Its compact 399cc liquid-cooled single cylinder delivers responsive performance ideal for both novice and experienced riders navigating mixed terrain. Known for exceptional maneuverability and low seat height, this Spanish machine excels in tight city environments and casual off-road exploration.

2004
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General information

CategorySuper motard
Year2004
ModelGAS GAS SM 50

Engine and Transmission Specifications

Transmission typefinal driveChain
Gearbox6-speed
Cooling systemLiquid
Fuel systemCarburettor
Bore x stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Stroke2
Engine typeSingle cylinder
Capacity:399.00 ccm (24.35 cubic inches)

Physical measures and capacities

Wheelbase1,475 mm (58.1 inches)
Ground clearance370 mm (14.6 inches)
Seat height920 mm (36.2 inches) If adjustable, lowest setting.
Dry weight93.0 kg (205.0 pounds)
 
 

GAS GAS SM 50 dimensions and frame

Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc
Front brakes diameter240 mm (9.4 inches)
Front brakesSingle disc
Rear tyre dimensions130/70-17
Front tyre dimensions100/80-17
Rear suspension travel250 mm (9.8 inches)
Rear suspensionProgressive system, Boge shock absorber.
Front suspension travel160 mm (6.3 inches)
Front suspensionShowa inverted fork
Frame typeType deltabox, made of rectangular profile Cr-Mo

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track75%
City70%
Cornering92%
Daily Riding45%
Touring20%
Passenger15%

Rider Profile

Best ForThis is a lightweight, sharp-handling supermoto best suited to riders with some prior experience on manual, top-heavy-feeling small-displacement bikes.
PurposeBuilt for flicking through tight corners, hooligan street riding, and light track or supermoto-day use rather than long-distance travel.
Rider FitIts very low dry weight and tall, narrow seat height favor riders who are comfortable with an aggressive, feet-up riding stance and don't need plush long-haul comfort.
CharacterA playful, nimble, high-strung single-cylinder machine that rewards an energetic, corner-hungry riding style.
Not Ideal ForNot a good fit for riders wanting a relaxed, comfortable, or high-speed touring machine, or anyone planning to regularly carry a passenger.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2004 GAS GAS SM 50 Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 920mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2004 GAS GAS SM 50, with a stretched knee angle of around 155 degrees and a forward-leaning riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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