Motocross Bikes
2012KTM 85 SX
30 fields on record
The 2012 KTM 85 SX is a two-stroke motocross bike for young racers moving up from 65cc machines. Its liquid-cooled 84.9cc single drives through a six-speed gearbox and chain, in a chassis built for competition. With a dry weight of 68 kg, a 750 mm seat and a 5-litre tank, it is sized for teenage riders on the track.
- Capacity
- 84.9 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 68.0 kg
- Seat height
- 750 mm
- Power
- Not on record
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How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It exists purely for motocross racing and track training at the junior level, with a peaky two-stroke engine and race-focused chassis.
- Built for
- It's an aggressive, high-revving two-stroke racer that rewards precise clutch and throttle control with sharp, flickable handling on motocross tracks.
- Not ideal for
- This is not suitable for adult riders, commuting, road use, touring, or carrying a passenger.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 84.9 ccm
- Engine type
- Single, two-stroke
- Bore x stroke
- 47.0 x 49.0 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Moric digital 2M1
- Lubrication system
- 0,5 l Motorex Topspeed 4T
- Power
- Not on record - add it
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc clutch, operated hydraulically
Dimensions & weight
- Wheelbase
- 1290 mm
- Seat height
- 750 mm
- Dry weight
- 68.0 kg
- Fuel capacity
- 5.00 litres
- Ground clearance
- 415 mm
Chassis & suspension
- Frame
- Chromium molybdenum
- Front suspension
- WP USD 43 mm (1.69 inches)
- Rear suspension
- WP monoshock PDS
- Front wheel travel
- 275 mm
- Rear wheel travel
- 300 mm
- Rake (fork angle)
- 24.0°
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 220 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 200 mm
- Front tyre
- 70/100-17
- Rear tyre
- 90/100-14
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2003 | 2007 | 2011 | 2012 | 2015 | 2019 |
|---|---|---|---|---|---|---|
| Capacity | 85 cc | 85 cc | 85 cc | 85 cc | 85 cc | 85 cc |
| Dry weight | 72 kg | 68 kg | 68 kg | 68 kg | 68 kg | 68 kg |
| Seat height | 900 mm | 750 mm | 750 mm | 750 mm | 750 mm | 890 mm |
| Fuel capacity | 5 L | 5 L | 5 L | 5 L | 5 L | 5.2 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 85 SX?
The 2012 KTM 85 SX has a Capacity of 84.9 ccm (5.18 cubic inches).
How many gears does the KTM 85 SX have?
The 2012 KTM 85 SX has a Gearbox of 6-speed.
How much does the KTM 85 SX weigh?
The 2012 KTM 85 SX has a Dry weight of 68.0 kg (149.9 pounds).
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