The long-awaited and much-anticipated 2021 Aprilia RS 660 is finally here. Slipping into an under-served niche in the motorcycling world, it is a high-tech mid-size sportbike that appealingly slots in-between genres

The 270-degree firing order and counterbalance weights give the 659cc motor a personality from the moment you push down on the start switch—always a great way to begin a ride. The V-twinish lope to the engine at idle is a pleasant way to spend time at a stoplight. Of course, any sportbike motor has to deliver the power to be fully successful.

With up/down quickshifting standard, it’s easy to change gears as needed. Much of that is about managing the fatigue caused by vibration. Due to the power delivery of the Aprilia RS 660, you won’t find yourself shifting as often as you might anticipate, unless you are in a serious hurry.
2021 Aprilia RS 660 Specs

Type: Parallel twin
Displacement: 659cc
Bore x stroke: 81 x 63.9mm
Maximum power: 100 horsepower at 10,500 rpm
Maximum torque: 49 ft-lbs @ 8500 rpm
Compression ratio: 13.5:1
Intake: EFI w/ two 48mm throttle bodies
Valvetrain: DOHC, 4vpc
Transmission: 6-speed with up/down quickshifter
Clutch: Assist-and-slipper
Final drive: Chain

Frame: Twin-spar aluminum w/ aluminum subframe
Front suspension; travel: Fully adjustable Kayaba inverted 41mm fork; 4.7 inches
Rear suspension; travel: Cantilevered, linkage-free, rebound-damping and spring-preload adjustable shock; 5.1 inches
Wheel: Aluminum alloy
Front wheel: 17 x 3.5
Rear wheel: 17. X 5.5
Front tire: 120/70 x 17
Rear tire: 180/55 x 17
Front brakes: 320mm discs w/ 4-piston radially, mounted Brembo calipers, radially mounted master cylinder, and steel-braided line
Rear brake: 220mm disc w/ twin-piston Brembo caliper w/ steel-braided line
ABS: Cornering aware w/ 6-axis IMU

Wheelbase: 53.9 inches
Rake: 24.1 degrees
Trail: 4.1 inches
Seat height: 32.3 inches
Fuel capacity: 4.0 gallons
Estimated fuel consumption: 48 mpg
Curb weight: 403 pounds

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