Introducing the Can-AM DS450 - Can-AM DS450 Forum - DS-450Central Forum
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post #1 of 1 (permalink) Old 04-01-2010, 12:39 PM Thread Starter
Join Date: Feb 2010
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Thumbs up Introducing the Can-AM DS450

After a long month of waiting, the Can-Am DS450 has finally been unveiled! And it was worth the wait! Sure, the looks are a bit, odd, but who cares when it has all these features! How will the DS450 stack up against the Yamaha YFZ450, Honda TRX450R, Kawasaki KFX450R, and Suzuki LT-R450? Time will only tell!

Discuss the all new Can-AM DS450 ATV in our Forums.

Stay tuned for more information as it comes available! We can't wait for can-am atv accessories, atv exhaust, and other atv parts! Also, keep checking Can-Am's website as we hear they will be running a special atv financing for this bike!

The Frame

Instead of welds, the DS 450™ frame utilizes lock-bolts. A lock-bolt is a two-piece fastener that provides a permanent clamp that resists loosening. The “bolt” is pre-stretched and the “nut” is basically pressed in place over the deep grooves of the bolt shank. Since there are no threads, the assembly is vibration resistant and can maintain clamping forces. In fact, because of the quasi-infinite fatigue life of lock-bolts, Airbus
uses them to affix the 119-foot wings to their new A380, the world’s largest aircraft.

Finite Element Analysis
Can-Am then balanced its revolutionary frame structure using Finite Element Analysis (FEA). During the computerized test, areas that appear in red indicate stress levels that approach the limit of the material. Blue shows that the load in an area is much less than the section can withstand. Can-Am used the test to add material where needed and
remove it where possible to achieve the optimum balance. Can-Am then balanced its revolutionary frame structure using Finite Element Analysis (FEA). During the computerized test, areas that appear in red indicate stress levels that approach the limit of the material. Blue shows that the load in an area is much less than the section can withstand. Can-Am used the test to add material where needed and remove it where possible to achieve the optimum balance.

Triangulated 3D Structure
Aluminum is much lighter than steel, but it also flexes a great deal more. To build a rigid aluminum frame with the traditional ATV ladder-type (box) geometry would require a great deal of gusseting and thicker members to resist excessive strain. But gussets and thick members add weight. And that defeats the purpose of using aluminum in the first place. Can-Am solved the problem by developing the first ATV frame with a triangulated 3D structure that naturally converts loads to pure tension and compression instead of bending.

Frame Type
ALTEC Twin Pyramidal frame with triangulated 3D structure*
Optimized through Finite Element Analysis (FEA)
Materials and Processes
Forged aluminum lower A-arm attachment
Cast aluminum hip members
Extruded aluminum beams
Stamped aluminum sub-frame*
Frame Construction
Mechanical Assembly – no weld structure*
Structural Fasteners
Aluminum, permanent, vibration-resistant Lock Bolts*
3/8" diameter (9.5 mm)
7075-T6 alloy bolt and 6061-T7 alloy nut
Developed with Alcoa Fastening Systems
* indicates industry first

The Suspension

All-aluminum A-arms, Knuckles And Wheel Hubs
Unsprung weight is the weight of all the components that follow the wheel travel, or everything not supported by the springs. The lower the unsprung weight, the faster the wheel assembly can move up and down to follow terrain irregularities and absorb impacts without transmitting too much movement to the vehicle. This results in a smoother ride and keeps the tires in contact with the ground. When unsprung weight is lower, the springs and shocks can be tuned to handle motion induced by the terrain, instead of trying to control inertia of the ATV’s suspension.

Inverted Brake Calipers And Peripheral Brake Discs
By putting the caliper "inside" a peripheral brake disc, the diameter can be increased as close as possible to the inside of the wheel. Larger discs improve potential braking power and precision feel.

Short Spindle Length
The spindle acts as a lever on the steering ball joints. The longer the lever, the more kickback is transmitted to the steering when the wheel hits an obstacle. With a long spindle lever, small impacts are felt as annoying kickback, tracking in brake bumps requires steering corrections, and bigger impacts take a toll on a rider's wrists. The DS 450’s short spindle lever reduces the negative steering feedback, providing a more confidence- inspiring ride.

Longest A-arms Possible For A Given ATV Width
When a double A-arm suspension travels up and down, the wheel moves in and out, in a "butterfly" motion. A short A-arm results in a pronounced arc and produces a significant amount of scrub. This sideways movement of the wheel causes loss of tire lateral traction and makes the vehicle dart from side to side in whoops sections. The DS 450 has longer A-arms so the radius of the arc produced by the A-arms is larger, resulting in less scrub – or outward movement of the wheel. The result: more predictable and precise handling.

Negative Scrub Radius
When braking, there is often a difference in grip between the two front wheels. This difference sends the ATV pivoting around the wheel that has more grip. This effect is amplified by a positive scrub radius, because that wheel is also being steered outward by forces acting on the tire – the positive scrub radius acts as the lever turning the wheels out around the kingpin axis. However, a negative scrub radius will cause the wheel to turn in under braking loads. So the turn-in effect fights against the pivoting motion of the bike around the front wheel that has more grip. The result: self- correcting behavior, providing the confidence to enter corners faster, and brake harder and later.

Suspension Type
R-Type double A-arm suspension
A-Arms Construction
Forged aluminum upper A-arm
Forged aluminum lower A-arm*
16.6" (422.5 mm) long, extended length
Front Shocks
KYB® HPG piggyback, aluminum body with compression and
rebound clickers and threaded pre-load adjustment
Front Suspension Travel
9.5" (241 mm)
Steering Construction
Chromoly 4130 high-strength steel
Knuckle Construction
One-piece forged aluminum knuckle with spindle*
Geometry Specifications
Camber: -0.8° @ ride height
Caster: 6.3°
Kingpin axis: 10.7°*
Scrub Radius: 0.2'' (5.2mm) negative*
Attack Angle (Rake): 14.0°
Brake System
WilwoodTM performance system with reverse twin-piston caliper*
Steel-braided hydraulic brake lines
Free-play quick-adjust on lightweight aluminum
Brake Discs
Wave peripheral rotors, 7.2" (182 mm) effective diameter*
Wheel Hub Construction
Cast aluminum
Aluminum, rolled-edges, polished
Specifically-designed ITP Holeshot® SR, 21x7 – 10 Radials

Drive Line and Rear Suspension

Mass Moment of Inertia

Mass moment of inertia is a measure that indicates how difficult it is to put an object into rotation around an axis. The lower the measurement, the higher the mass centralization. For example, a bowling ball is easier to rotate than a barbell with the same weight and therefore would have a lower mass moment of inertia. ATV components with the greatest impact on this measurement are the drive line and rear suspension. They are heavy and by necessity, located far from the center of gravity. The mass moment of inertia for the DS 450 is 4% lower than the best-in-class competitor and 11% lower than the worst-in-class competitor.

Rear Axle
Because of its distance from the center of gravity and solid steel construction, the rear axle of an ATV plays a vital role in obtaining the most mass centralization, lowest weight and lowest unsprung weight. To achieve these objectives, the teams designed a hollow, Chromoly 4140 high-strength steel axle. Since aluminum is lighter than steel, weight was also saved by shortening the axle and extending the reach of the lighter weight all-aluminum “spider” hubs. The resulting low unsprung masses in the rear provides the additional benefit of increased traction because the wheels can move up and down faster to better follow terrain irregularities instead of leaving the ground.

Suspension Type
R-Type swing arm suspension with rising rate linkage
Swing Arm Construction
Cast aluminum
Rear Shock
KYB∞ HPG piggyback, aluminum body with compression and
rebound clickers and threaded pre-load adjustment
Rear Suspension Travel
10.5" (267 mm)
Rear Axle Construction
Chromoly 4140 high-strength steel, 3/4" I.D. hollow axle
Drive System
520 O-ring high-capacity chain
Aluminum sprocket hub, with aluminum chain sprocket
Brake System
Lightweight single-piston Wilwood∞ performance system
Steel-braided hydraulic brake lines
Brake Disc
Wave rotor, 7.8" (198 mm), on aluminum brake disc hub
Wheel Hub Construction
Extended-reach aluminum hub, with precision-machined splines
Aluminum, rolled-edges, polished
Specifically-designed ITP Holeshot∞ SR, 20x10 - 9 Radials

*Information, and pictures taken from DS-450Central is not associated with Can-Am BRP. © 2007 Bombardier Recreational Products Inc (BRP).
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