| General |
| Year | 2011 | 2025 |
| Make Model | Harley Davidson FLSTF Fat Boy | BMW R 12G/S |
| Dimensions |
| Seat Height | Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in | 860 mm / 33.9 in (875 mm / 34.4 in Enduro Package) |
| Wheelbase | 1715 mm / 67.5 in | 1580 mm / 62.2 in (1585 / 62.4 in Enduro Package) |
| Length | 2445 mm / 96.2 in | 2200 mm / 86.6 in |
| Width | - | 830 mm / 32.7 in |
| Weights & Capacities |
| Wet Weight (kg) | 329.0 | 229 |
| Fuel Capacity | 18.9 Litres / 5.0 gal | 15.5 Litres / 4.1 US gal |
| Maximum Load / GVWR | 526.0 kg / 1160 lbs | - |
| Wet Weight | 329.0 kg / 725 lbs | 229 kg / 505 lbs |
| Performance |
| Max Power | - | 81 kW / 109 hp @ 7000 rpm |
| Max Torque | 124.7 Nm / 92 ft. lbs @ 3000 rpm | 115 Nm / 81 lb-ft @ 6500 rpm |
| Engine |
| Displacement | 1584 cc / 96 cu-in | 1170 cc / 71.4 cub in |
| Engine Detail | Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, with four camshaft-operated valves and two overhead camshafts per cylinder. |
| Bore x Stroke | 95.25 x 111.25 mm | 101 x 73 mm |
| Compression Ratio | 9.2:1 | 12:1 |
| Cooling System | Air cooled | Air/oil cooled |
| Emissions | - | Controlled 3-way catalytic converter, exhaust emission standards EU-5+ |
| Fuel Induction | Electronic Sequential Port Fuel Injection (ESPFI) | Electronic intake pipe injection / digital engine management system: BMS-O with throttle-by-wire |
| Fuel Type | - | Unleaded super (premium), octane number 95-98 (RON) (rated output at 98 RON) |
| Ignition | Single-fire, non-wasted, map-controlled spark ignition | - |
| Lubrication | - | Wet sump |
| Starter | Electric | Electric |
| Drivetrain |
| Clutch | Multi-plate, wet | Single dry plate clutch, hydraulically operated |
| Final Drive | Belt | Universal shaft |
| Gear Ratios | 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.790 | 1st = 2.375, 2nd = 1.696, 3rd = 1.296, 4th = 1.065, 5th = 0.939, 6th = 0.848 |
| Primary Drive Ratios | - | 1.737 |
| Transmission / Drive | 6 Speed | 6-Speed, claw-shifted transmission with separate transmission housing |
| Chassis |
| Frame Type | Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded | Four-part frame concept with front frame and three-part rear frame, load-bearing engine-gearbox unit, rear-seat frame removeable for one-up riding |
| Suspension - Front | 41.3 mm telescopic, chrome dust covers | 45 mm USD telescopic forks, spring base, rebound and compression damping adjustable |
| Suspension - Rear | Hidden, horizontal-mounted, coil-over shock | Aluminum Paralever swinging arm, directly linked WAD spring strut, spring base, rebound and compression damping adjustable |
| Rake | 31.6° | - |
| Steering Head Angle | - | 63.1° (63.2° Enduro Package) |
| Trail | 147 mm / 5.7 in | 120.8 mm / 4.76 in (121.3 / 4.76 Enduro Package) |
| Wheel Travel - Front | - | 210 mm / 8.3 in |
| Wheel Travel - Rear | - | 200 mm / 7.9 in |
| Wheels & Brakes |
| Brakes - Front | Single 292mm disc 4 piston caliper | 2 x 310mm disc brake, with two axially bolted 2-piston floating calipers |
| Brakes - Rear | Single 292mm disc 4 piston caliper | Single 265 mm disc, 2 piston floating caliper |
| ABS | - | BMW Motorrad ABS Pro (lean angle optimised) |
| Rims - Front | - | 2.15 x 21 |
| Rims - Rear | - | 4.0 x 17 (4.0 x 18 Enduro Package) |
| Tyres - Front | 140/75R17 | 90/90/21 |
| Tyres - Rear | 200/55R17 | 150/70 - R17 (150/70 - R18 Enduro Package) |
| Wheels | - | Aluminium cross-spoke wheels |