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2025 BMW R 12G/S Overview
The 2025 BMW R 12G/S is a custom / cruiser motorcycle built around 1170 cc of displacement. Under the tank sits a Four stroke, two cylinder horizontally opposed Boxer, with four camshaft-operated valves and two overhead camshafts per cylinder engine, a compression ratio of 12:1. The bore and stroke measures 101 x 73 mm. 2025 BMW R 12G/S delivers 81 kW @ 7000 rpm of peak power and 115 Nm @ 6500 rpm of torque. From a practical standpoint, the 2025 R 12G/S tips the scales at 229 kg, carries a 15.5-litre fuel tank, offers a seat height of 860 mm and spans a 1580 mm wheelbase. That's roughly 51.8 kg lighter than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2025 BMW R 12G/S spec sheet covering every technical detail from suspension travel to tyre sizes.
2025 BMW R 12G/S compared with other bikes in the Custom / cruiser category
Here is how the 2025 BMW R 12G/S stacks up against other bikes in the Custom / cruiser category in our database. Each model counts once, using the model year closest to this one, and the comparison covers up to 1316 models.
- Seat height of 860 mm is taller than that of every one of the other 1315 bikes in the Custom / cruiser category.
- Only 29 of the other 332 bikes in the Custom / cruiser category have a higher power-to-weight ratio than the 354 W/kg of the R 12G/S.
- With 81 kW, the R 12G/S has the joint 108th highest power output of 615 bikes in the Custom / cruiser category, 38% above the category average of 58.9 kW.
- Narrowing the field to the 205 models within five model years of it, the seat height of 860 mm is taller than that of every one of the other 204.
2025 R 12G/S - Pros & Cons
Strengths
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Strong power output: 2025 BMW R 12G/S makes 81 kW @ 7000 rpm with 115 Nm @ 6500 rpm of torque - competitive figures for its class.
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Fuel injection: The Electronic intake pipe injection / digital engine management system: BMS-O with throttle-by-wire system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
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Strong front braking: The disc front brake gives excellent stopping power and responds well to aftermarket braided lines.
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Low-maintenance final drive: Shaft final drive means no chain to clean, lube or adjust - meaningfully less routine maintenance than a chain-driven equivalent.
Considerations
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Tall seat height: The 860 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
Wear Points & Servicing Notes
Heat management in traffic
R 12G/S's air-cooled design means engine-bay temperatures build up more in stop-start traffic than on a liquid-cooled equivalent - a function of the cooling method itself, not a defect. Mesh riding gear and avoiding prolonged idling help in hot climates.
Fuelling & injector care
Fuelling comes from Electronic intake pipe injection / digital engine management system: BMS-O with throttle-by-wire. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.
Brake disc and pad wear
The disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the R 12G/S runs 45 mm USD telescopic forks, spring base, rebound and compression damping adjustable and Aluminum Paralever swinging arm, directly linked WAD spring strut, spring base, rebound and compression damping adjustable at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by shaft - no chain or belt maintenance at all, though the drive-shaft oil should be changed on the manufacturer's interval.
Frame & chassis check
The frame is 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 - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
Handling the weight at a standstill
At 229 kg, the R 12G/S is a substantial machine - low-speed manoeuvring in car parks takes more physical effort than on a lighter bike, though the weight disappears once rolling.
R 12G/S - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2025 BMW R 12G/S with its 1170 cc custom / cruiser, start with the basics: check the service book for oil change frequency, inspect the drivetrain for wear, and look for oil seepage around the engine casings and rocker covers. This model runs shaft final drive, so ask for proof the shaft-drive gear oil has been changed on schedule - it's easy to overlook since there's no chain to draw attention to it. A cold start test is invaluable - a well-maintained R 12G/S should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task for the R 12G/S's 1170 cc four stroke, two cylinder horizontally opposed boxer, with four camshaft-operated valves and two overhead camshafts per cylinder.. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. With a 12:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The R 12G/S's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
2025 BMW R 12G/S - Frequently Asked Questions
What engine does the 2025 BMW R 12G/S have?
The 2025 BMW R 12G/S uses a Four stroke, two cylinder horizontally opposed Boxer, with four camshaft-operated valves and two overhead camshafts per cylinder. engine with 1170 cc of displacement. It is air/oil cooled.
How much does the 2025 BMW R 12G/S weigh?
The 2025 BMW R 12G/S weighs 229 kg. This is the manufacturer's wet figure.
How much power does the 2025 BMW R 12G/S make?
The 2025 BMW R 12G/S produces 81 kW @ 7000 rpm of power and 115 Nm @ 6500 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2025 BMW R 12G/S?
The 2025 BMW R 12G/S has a 15.5-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 258-310 km between stops.
Is the 2025 BMW R 12G/S suitable for shorter riders?
The 2025 BMW R 12G/S has a seat height of 860 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2025 BMW R 12G/S have?
The 2025 BMW R 12G/S uses 2 x 310mm disc brake, with two axially bolted 2-piston floating calipers at the front and single 265 mm disc, 2 piston floating caliper at the rear.
What tyre sizes does the 2025 BMW R 12G/S use?
The 2025 BMW R 12G/S runs 90/90/21 front and 150/70 - R17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2025 BMW R 12G/S have?
The 2025 BMW R 12G/S is fitted with a 6-Speed, claw-shifted transmission with separate transmission housing transmission.
Key Specifications
Engine
Four stroke, two cylinder horizontally opposed Boxer, with four camshaft-operated valves and two overhead camshafts per cylinder.
Power
81 kW / 109 hp @ 7000 rpm
Torque
115 Nm / 81 lb-ft @ 6500 rpm
Fuel Capacity
15.5 Litres / 4.1 US gal
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Full 2025 BMW R 12G/S Specifications
Year
2025
Make
BMW
Model
R 12G/S
Make Model
BMW R 12G/S
Seat Height
860 mm / 33.9 in (875 mm / 34.4 in Enduro Package)
Wheelbase
1580 mm / 62.2 in (1585 / 62.4 in Enduro Package)
Length
2200 mm / 86.6 in
Width
830 mm / 32.7 in
Fuel Capacity
15.5 Litres / 4.1 US gal
Wet Weight
229 kg / 505 lbs
Stroke
73.0 mm
Bore x Stroke (in,)
3.98 x 2.87 in
Bore x Stroke (mm)
101.0 x 73.0 mm
Displacement (cc)
1170 cc
Displacement (ci)
71.4 cu-in
Displacement
1170 cc / 71.4 cub in
Engine Detail
Four stroke, two cylinder horizontally opposed Boxer, with four camshaft-operated valves and two overhead camshafts per cylinder.
Bore x Stroke
101 x 73 mm
Compression Ratio
12:1
Cooling System
Air/oil cooled
Emissions
Controlled 3-way catalytic converter, exhaust emission standards EU-5+
Fuel Induction
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)
Lubrication
Wet sump
Starter
Electric
Clutch
Single dry plate clutch, hydraulically operated
Final Drive
Universal shaft
Gear Ratios
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, claw-shifted transmission with separate transmission housing
Frame Type
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
45 mm USD telescopic forks, spring base, rebound and compression damping adjustable
Suspension - Rear
Aluminum Paralever swinging arm, directly linked WAD spring strut, spring base, rebound and compression damping adjustable
Steering Head Angle
63.1° (63.2° Enduro Package)
Trail
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
Brakes - Front
2 x 310mm disc brake, with two axially bolted 2-piston floating calipers
Brakes - Rear
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
90/90/21
Tyres - Rear
150/70 - R17 (150/70 - R18 Enduro Package)
Wheels
Aluminium cross-spoke wheels
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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