Sunday 18 January 2009

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2009 Honda CRF450R Chassis/Suspension Features


Fifth-generation Twin-Spar Aluminum Frame with forged-aluminum steering head is now 14 ounces lighter than previous design. Spar height was reduced (70 to 66mm) and width was narrowed (27 to 26mm). Stronger downtubes improve front-end feel.

Steering response and overall handling were improved by moving the steering head pipe back 10mm (and closer to swingarm pivot). Positioning the front wheel 15mm farther back and closer to the crankshaft.

Swingarm is 18mm longer for improved traction.

Frame, steering head and swingarm modifications permit a reduction in triple-clamp offset (22 to 20mm).

Swingarm cross-member wall thickness was reduced (3.75 to 3.0mm) to save weight.

Forged swingarm pivot plates increase rigidity for improved handling.

Lower engine frame rails are widened and beveled to provide added cornering clearance.

Removable rear subframe was redesigned to eliminate brackets and cross-members. Shape altered to improved air filter access and narrow the bike profile.


Honda Progressive Steering Damper (HPSD) revalved for more linear damping. HPSD features a compact damper attached to the lower triple clamp and the steering head to allow more aggressive steering characteristics and assist straight-line handling. Damping action smoothly progresses as handlebar deflection increases, which produces very natural steering characteristics and feel.

Front and rear wheels feature HRC works-type lightweight aluminum spoke nipples.

Front wheel featuring new stiffer axle collar provides excellent rigidity.

Rear axle diameter of 25mm and large-diameter bearings provide additional rigidity.

Axle wall thickness reduced (2.5 to 2.2mm) to save weight (38 grams) while axle collar is strengthened for better rigidity.

Revised, sophisticated inverted Air-Oil-Separated (AOS) fork features exclusive Honda 48mm diameter fork made by Kayaba with all-new damping and spring settings.

Pro-Link® Rear Suspension features exclusive Kayaba integrated reservoir with all-new damping and spring settings.

Large 50mm rear shock damper piston diameter for consistent performance under demanding riding conditions.

HRC works-style rear brake system integrates the rear master cylinder and fluid reservoir, eliminating the separate reservoir and hose.

Link-type front brake master cylinder and a lightweight brake rotor provide strong braking.
Re-shaped works-style 240mm front brake rotor is 1.3 ounces lighter. Front disc guard is smaller, lighter and vented.

240mm rear brake rotor features works-style pattern and is 1 ounce lighter. New plastic disc guard saves 4 grams of weight.

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