BMW R 1150 GS (R21) — OEM Fluid, Tire Pressure & Maintenance Specs
1,130cc Air/Oil-Cooled Boxer Twin 8-Valve (6-Speed Dry Clutch) · Source: BMW R 1150 GS (R21) (1999–2004) Official Owner’s Manual Maintenance Specifications
According to the BMW R 1150 GS (R21) (1999–2004) Official Owner’s Manual Maintenance Specifications, the 1999–2004 BMW R 1150 GS (R21) (chassis R21/0415) requires 3.5 L (3.70 US qt) of SAE 20W-50 (JASO MA2, API SJ / BMW Advantec Pro 15W-50) engine oil for a drain-only change and 3.75 L (3.96 US qt) with filter service (11421460845 / HF163). Standard solo cold tire pressure is 220 kPa / 2.20 bar / 32 PSI front (110/80 R19) and 250 kPa / 2.50 bar / 36 PSI rear (150/70 R17), paired with 2× NGK BKR7EKC spark plug(s) and a YTX14-BS / BMW 14Ah AGM battery.
Drain only: 3.5 L (3.70 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~398 km (247 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Single-Plate Manual Clutch (Separate Gearbox Oil) |
|---|---|
| Recommended Viscosity & Grade | SAE 20W-50 (Alt: SAE 20W-50) · JASO MA2 · API SJ / BMW Advantec Pro 15W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 3.5 L (3.70 US qt) • With filter/strainer: 3.75 L (3.96 US qt) • Complete dry overhaul: 4.1 L (4.33 US qt) |
| OEM Oil Filter Code & Type | 11421460845 / HF163 |
| Correct Oil Level Check Method | Hold bike upright on level ground 3–5 min after warm shutdown; read crankcase sight glass |
| Oil Drain Bolt Torque | 32 N·m (23.6 lb-ft / 3.26 kgf·m) — Use fresh crush washer |
| Separate Transmission / Gearbox Oil | 800 ml (0.80 L) — SAE 75W-90 GL-5 (800 ml separate manual gearbox) |
| Final Drive / Bevel Gear Oil | 180 ml (0.18 L) — SAE 75W-90 Hypoid Axle Oil (180 ml Paralever bevel drive) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/80 R19 · Rear: 150/70 R17 (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 220 kPa / 2.20 bar / 32 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 250 kPa / 2.50 bar / 36 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | NGK BKR7EKC × 2 (Gap: 0.8 mm) |
| OEM Battery Code & Rating | YTX14-BS / BMW 14Ah AGM (12V 14.0Ah MF AGM) |
| Final Drive Maintenance | Cardan Shaft Final Drive — Replace rear bevel-gear hypoid oil at exact measured volume |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 1130 cc · 85 hp @ 6,750 rpm · 98 N·m (72.3 lb-ft) @ 5,250 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 840 mm (33.1 in) · 249 kg (549 lbs) |
| Fuel Tank & Est. Real-World Range | 22.1 L (5.8 US gal) · ~18 km/L → ~398 km (247 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 10,000 km / 10,000 km • Air Filter / Spark Plug: 20,000 km / 20,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Classic R21 Oilhead introducing a 6-speed gearbox and hydraulic dry clutch; gained Twin Spark heads in 2003 and uses recessed spin-on filter 11421460845 (HF163).
Oil & Clutch Mechanical Engineering Note
BMW air/oil-cooled Boxer platform (R 1150, K25 R 1200, R nineT family, R 12, R 18) featuring an automotive dry single-plate clutch with separate engine, gearbox, and shaft bevel oils.