2015 KTM 450 SX-F

KTM released information on its complete line of 2015 four-stroke SX-F line of motocrossers. Here is what’s new:

CHASSIS

                New machined cross tube in the frame that provides a stronger more accurate connection of the frame and the linage due to an improved production process resulting in a 60 gram weight reduction. The frame is now powder-coated in KTM Factory orange

                New linkage geometry with an improved rising rate, better control, stability and balance

                For the linkage there is now an improved production process for higher quality resulting in a 40 gram weight reduction

                New WP 4CS fork specifically designed for Motocross

                New fork lugs with a 22mm front axle for reduced weight and better feel along with a 2mm reduced off-set for improved handling

                New fork protectors with an open design, which are easier to replace for better maintenance and cleaning of the fork leg

                New monoshock setting, which has been re-valved and set-up to match the new linkage and fork. The shock features a 4mm increase of shaft travel while maintaining the same amount of wheel travel with the new linkage package

                New Dunlop GEOMAX MX52 tires for excellent traction in all conditions

                New aluminum o-ring support for the lower bearing on the steering stem for a weight saving of 22 grams and a new steering stem bolt, which is also 8 grams lighter

                New high-quality black colored Excel rims for aggressive looks and top performance

                New softer two-compound grips

2015 350 SX-F

Frame

The improved, modern and lightweight frame design manufactured by WP Performance Systems is made from lightweight, high-strength chromoly steel sections. The design now has a new machined cross tube that unites the two sides of the frame and connects the linkage rods to the frame.  This provides exact production tolerances and consistent chassis characteristics thanks to the absence of welding. It is also lighter (58 grams) than the previous cross tube design.

Swingarm

Created using the latest in calculation and simulation software, the design and wall thickness of the cast aluminum swingarm has been refined for minimum weight at optimum stiffness. Precisely defined flexibility provides perfect stability, which gives excellent traction, stability and comfort.

Rear suspension

The new fully adjustable rear monoshock by WP Suspension has been re-valved and set-up to match the new linkage geometry and characteristics. A 4mm longer stroke allows the same amount of wheel travel thanks to the new linkage design.

Linkage

The suspension package features a new linkage with revised geometry due to the development and testing done by the Red Bull KTM Factory Team along with the US R&D department. These revisions provided an optimized rising rate that utilizes a higher starting rate to achieve a flatter, less progressive curve for better control. The innovative production process of the triangle and pull-rod saves 40 grams of weight while improving the quality of the component.

2015 250 SX-F

Front suspension

For the United States, the SX model range features the WP 4CS fork. The completely new four chamber fork has been specifically designed and tested for motocross. The advanced 4CS fork offers improved damping, is lighter than previous models and can be adjusted easily for compression and rebound via the dials on the top of the fork tubes.

Front Axle

The front axle has been reduced in size from 26mm to 22mm to reduce weight and offer a better front-end feel. Also with the smaller axle it was possible to move it back 2mm in the axle clamp. The adjusted offset and increased trail provides more stability.

Front fork protectors

The fork protectors have been revised to fit to the new axle clamps, and are also lighter. They allow easier access to the fork legs for quicker cleaning and faster maintenance.

Triple clamps

Top quality CNC machined triple clamps have been something of a KTM trademark for years. Offering a precise handling with top quality performance, they particularly support the flex characteristics, and with it, the forks’ action. The o-ring support for the lower bearing on the steering stem has been revised and is now made of aluminum to save 22grams, while the steering stem bolt is now also 8 grams lighter.

Bodywork and graphics

In shaping the bodywork the KTM designers’ ergonomic and design focus was to achieve complete harmony between rider and bike, right down to the finest details. The front fender is a prime example of a molded polymer component, gaining maximum stability through a well thought-out structure and mounting system. The bodywork is decorated with updated graphics to highlight the racing character of the 2015 SX range.

Wheels

The wheel rims are now colored in black for aggressive looks and use lightweight, CNC machined hubs, high-end Excel rims and spokes with lightweight aluminium nipples to achieve maximum stability at minimum weight. The wheels are fitted with the latest MX tires from Dunlop, the Geomax MX52, which have been developed with the RedBull KTM Factory Racing team and the US R&D department. The tires guarantee excellent traction and outstanding performance.

Sprocket

The new sprocket design is 50grams lighter and contributes to the overall refining of the 2015 KTM motocross range.

Hand grips

New, softer two-compound grips are used on the 2015 motocross models for increased comfort and less stress on the rider’s hands in every situation.

MOTOR

  2015 250 SX-F  2

250 SX-F

Revisions of the engine include a lighter clutch basket and new clutch springs for a more consistent behavior under stress and over time as part of the CSS (coil spring steel) one-piece clutch system. The clutch continues to use the Brembo hydraulic system for light operation and controllable modulation. Within the proven DOHC engine are also new O-rings on the oil pump suction screen for increased durability.

-                 NEW O-rings on the oil pump suction screen for increased durability

-                 NEW clutch basket with a weight saving design

-                 NEW clutch springs for more consistent behavior under stress and over time

350 SX-F

-                 NEW O-rings on the oil pump suction screen for increased durability

-                 NEW clutch basket with a weight saving design

450 SX-F

-                 NEW O-rings on the oil pump suction screen for increased durability

 

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