Thanks to its rugged character, the KTM 85 SX is an unstoppable motorcycle that can attack the most difficult terrains with poise.

It comes with a 43 mm upside-down fork which delivers 270 mm of suspension travel and a PDS shock absorber with adjustable rebound and compression damping. You also get a new swingarm which is 500 grams lighter than the previous one and newly designed chain links and brake-hose brackets.

At the heart of the KTM 85 SX sits an 84.93 cc, 1-cylinder, 2-stroke, water-cooled engine with reed intake and exhaust control. The unit transfers its power to the ground by means of a six speed, claw shifted transmission with multidisc clutch.

Other notable features include the lightweight wheels with CNC-machined hubs and high end Excel rims, lightweight wave brake discs (220/210 mm f/r) with radially mounted brake calipers (4 pistons at the front, 2 at the rear), revamped graphics and the chrome-molybdenum steel frame with a lightweight aluminium rear end.

Hit the jump for more information.

  • 2015 KTM 85 SX
  • Year:
  • Make:
  • Engine:
    1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
  • Transmission:
  • Energy:
  • Displacement:
    84 cc
  • Top Speed:
    65 mph (Est.)


2015 KTM 85 SX Exterior
- image 556914

2015 KTM 85 SX: The Little Big One.

In the junior class from 11 to 15 years of age, there are no longer any beginners pootling around. This is where future champions fight for victory, whether it be in the Junior WC or a regional championship. The 85 SX is regarded as a winning bike in this scene. With the most powerful engine in the field and an ultra-light, sturdy chassis, it has nothing to fear from any full-size bike.

2015 KTM 85 SX Key Features:

2015 KTM 85 SX Exterior
- image 556913

Masters the toughest tracks

2015 KTM 85 SX Exterior
- image 556912

The proven 43 mm upside-down fork with 270 mm of suspension travel and the PDS shock absorber ensure optimum traction and suspension comfort on the KTM 85 SX. Rebound and compression damping can be adapted individually to track and rider in no time at all.

As before, the newly developed swingarm is manufactured from lightweight aluminium in the form of a single casting. The very latest calculation methods have allowed weight to be reduced by 500 grams. Furthermore, newly designed chain links and brake-hose brackets plus the proven chainguide from the full-size SX models have been employed.

Unrivalled power

2015 KTM 85 SX Exterior
- image 556910

Thanks to the optimally dimensioned connecting rod, the crankshaft excels with minimum vibration and maximum durability.

State-of-the-art 2-stroke technology in conjunction with a precise 6-speed transmission and a hydraulic clutch provide the basis for the superiority of the 85 SX in all junior race series.

The compact cylinder with 47 mm bore ensures that the 85 SX achieves peerless performance thanks to the ports dimensioned for optimum gas flow and the centrifugally-controlled exhaust valve. A reworked rear transfer port guarantees even better durability.

What’s good for the bigger KTM offroad bikes is good for the 85 SX: air filter replacement without tools in a matter of seconds.

Constant temperature control and hence consistently high performance are ensured by an intelligent cooling circuit with integrated crankcase cooling and two radiators.

The 85 SX engine is equipped with a modern, hydraulic clutch actuation system from FORMULA, which guarantees smooth and very precise clutch control.

Stable in every situation

2015 KTM 85 SX Exterior
- image 556908

The frame made of high quality, chrome-molybdenum steel with a lightweight aluminium rear end guarantees maximum stability at a minimum weight. Its hardwearing plastic coating is still in a classy anthracite metallic.

The revamped, cool graphic design provides the bike with a striking new appearance.
The bodywork is designed ergonomically and functionally in such a way that the motorcycle is in perfect harmony with the rider.

The 85 SX is equipped with an extremely sturdy, tapered Renthal handlebar made from high-grade aluminium alloy, which features an offset specially designed to meet the demands of motocross.

Wheels and brakes

2015 KTM 85 SX Exterior
- image 556907

The wheels are fitted with lightweight, CNC-machined hubs and high-end Excel rims, plus black-coated spokes with lightweight aluminium nipples, guaranteeing highest levels of stability while keeping weight to a minimum. The 85 SX is now equipped with the very latest generation tyre from MAXXIS, featuring a profile that guarantees optimum grip on every surface.

The greater the power, the more important the brakes. Here the products from brake specialist FORMULA live up to all the expectations of young racers. Together with the lightweight wave brake discs (220/210 mm f/r), the proven, radially mounted brake calipers (4 pistons at the front, 2 at the rear) set the benchmark in terms of application and brake performance.


Engine 1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement 84.93 cm³
Bore 47 mm
Stroke 48.95 mm
Starting aid Kick starter
Transmission 6-gear, claw shifted
Engine lubrication Mixture oil lubrication
Primary transmission 19:66 straight cut spur gear
Secondary ratio 14:46
Cooling Water-cooled
Clutch Multidisc clutch in oil bath/hydraulically activated
Ignition Moric Digital 2M1
Frame Central tube frame made of chrome molybdenum steel tubing
Fork WP Suspension 4357 MXMA
Shock absorber WP Suspension PDS 4618 BAVP DCC
Suspension travel Front 270 mm
Suspension travel Rear 300 mm
Brake system Front Disc brake with four-pot brake caliper
Brake system Rear Disc brake with two-pot brake caliper
Brake discs - diameter front 220 mm
Brake discs - diameter rear 210 mm
Chain 1/2 x 5/16”
Steering head angle 66°
Wheelbase 1,290±10 mm
Ground clearance, unloaded 352 mm
Seat height, unloaded 855 mm
Fuel tank capacity, approx. 5.0 l Unleaded premium fuel (98 octane), mixed with 2-stroke engine oil (1:40)
Weight without fuel, approx. 67.5 kg
About the author
What do you think?
Show Comments
Motorcycle Finder: