Aprilia Tuono 660 (2021) vs BMW K100 RS (1985)
Comparison technical specifications
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| Make: | Aprilia | BMW |
| Model: | Tuono 660 | K100 RS |
| Years: | 2021 | 1985 |
| Engine: | Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder | Four stroke, horizontal in line four cylinder, DOHC, 2 valves per cylinder |
| Capacity: | 659 cc / 40.2 cu-in | 987 cc / 60.2 cub. in |
| Bore x Stroke: | 81 x 63.93 mm | 67 x 70 mm |
| Compression Ratio: | 13.5: 1 | 10.2:1 |
| Cooling System: | Liquid cooled with radiator and water-oil heat exchanger | Liquid cooled |
| Lubrication: | Wet sump | Wet sump |
| Exhaust: | Akrapovič - for race use only | Stainless steel, 4 into 1 |
| Induction: | Airbox with front air intake. 2 x 48 mm throttle bodies, Ride-By-Wire management | Electronic injection, Bosch LE-Jetronic |
| Starting: | Electric | Electric |
| Max Power: | 100 hp / 73.5 kW @ 10,500 rpm | 65.6 kW / 90 hp @ 8000 rpm |
| Max Torque: | 67.0 Nm / 6.83 kgm @ 8,500 rpm | 86 Nm / 8.8 kgf-m / 63 ft-lb @ 6000 rpm |
| Clutch: | Wet, multi-plate, slipper | Dry, single plate, cable operated |
| Transmission: | 6 Speed, Aprilia Quick Shift (AQS) System up and down (available as optional accessory) | 5 Speed |
| Final Drive: | Chain, with drive ratio: 17/43 | Shaft |
| Frame: | Aluminum dual beam chassis with removable seat-supporting subframe | Tubular space frame, engine serving as load bearing component |
| Front Suspension: | Kayaba 41 mm USD fork with top out spring, Aluminum pins to fasten radial calipers. Rebound and spring preload adjustment on a single stanchion | Telescopic fork with hydraulic shock absorber |
| Front Wheel Travel: | 110 mm / 4.3 in | 185 mm / 7.3 in |
| Rear Suspension: | Asymmetrical aluminum swingarm. Single shock and top out spring with rebound and spring pre-load adjustment | Monolever swinging arm |
| Rear Wheel Travel: | 130 mm / 5.1 in | 110 mm / 4.3 in. |
| Front Brakes: | 2x 320mm Brembo radial calipers with 4 horizontally opposed 32 mm pistons. Radial pump and metal braided brake hose | 2 x ∅285 mm discs, 2 piston calipers |
| Rear Brakes: | Single 220mm disc; Brembo caliper with two 34 mm separate pistons. Master cylinder with separate reservoir and metal braided hose Multimap ABS (Cornering ABS available as optional accessory) | Single ∅285 mm disc, 1 piston caliper |
| Wheels: | Aluminum alloy | Alloy, 8 spoke |
| Front Tyre: | 120/70 ZR 17 Tubeless radials | 100/90-V18 |
| Rear Tyre: | 180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials | 130/90-V17 |
| Dimensions: | Length 1995 mm / 78.5 in Width 805 mm / 31.7 in | Length 2220 mm / 87.4 in Width 800 mm / 31.5 in Height 1271 mm / 50.0 in |
| Wheelbase: | 1370 mm / 53.9 in | 1516 m /59.7 in. |
| Seat Height: | 820 mm / 32.2 in | 810 mm / 31.90 in. (760 mm / 29.9 in for low seat model) |
| Wet Weight: | 183 kg / 403.4 lbs | 249 kg / 548 lbs |
| Fuel Capacity: | 15 Litres / 3.9 US gal | 22 Liters / 5.8 US gal |