Norco’s Advanced Ride Technology (ART) is an optimization of the proven FSR suspension system which delivers a more efficient pedaling and improved square edge bump compliant ride than ever before. This has been achieved by changing the location of the pivot points to achieve more chain growth and a more rearward axle path. The increased chain growth results in higher anti-squat characteristics which reduces suspension bob, making the bike pedal efficiently. The rearward axle path lets the rear wheel move back at the same time as it moves up to get out of the way of large, square edge bumps more effectively, allowing the bike to roll smoother and faster over rough terrain.
1. Improved Square Edge Bump Compliance
This refers to the suspension absorbing tall bumps where there is rearwards force put on the wheel in addition to vertical force. Figure 3. illustrates the forces involved in a square edge bump. If the wheelpath is rearward, the wheel can move backwards and upwards at the same time to get out of the way of the bump more quickly and efficiently. This allows the bike to roll much smoother and faster over bumpy terrain.
2. Increased pedaling efficiency
When a bicycle accelerates forward, inertia pulls the rider’s weight towards the back which results in compression of the rear suspension. This is known as squat. ART suspension is designed so that when the suspension compresses, the chainstay length increases. This is known as chain growth. When the rider puts force on the pedals, the chain becomes very tight and the bicycle will accelerate forward. The chain tension will also force the suspension to extend. This extension force is known as the anti-squat force because it counteracts the squat caused by the acceleration. With 30% more chain growth than before, ART suspension is designed to resist squat forces and reduce pedal bob, resulting in a highly efficient pedaling platform.
3. Improved Leverage Ratio Curve
A.R..T suspension uses a lower and more progressive leverage ratio to increase the bottom out resistance and improve the tuneability of the suspension. Lowering the leverage ratio reduces the amount of force on the shock which gives the shock greater control of the suspension movement. The adjustment dials on the shock will also have a greater effect on suspension performance, allowing the rider to fine tune the suspension to their liking. A more progressive leverage ratio makes the suspension get stiffer as it gets farther into its travel, giving the suspension that ‘bottomless’ feel.