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2025 BMW R 12 S Overview
The 2025 BMW R 12 S is a custom / cruiser motorcycle built around 1170 cc of displacement. Under the tank sits a Four stroke, two cylinder horizontally opposed Boxer, two camshafts and four radially aligned valves per cylinder, central counter balancer shaft engine, a compression ratio of 12:1. 2025 BMW R 12 S delivers 81 kW @ 7000 rpm of peak power and 115 Nm @ 6500 rpm of torque. From a practical standpoint, the 2025 R 12 S tips the scales at 220 kg, carries a 15.9-litre fuel tank, offers a seat height of 795 mm and spans a 1511 mm wheelbase. That's roughly 80.6 kg lighter than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2025 BMW R 12 S spec sheet covering every technical detail from suspension travel to tyre sizes.
2025 R 12 S - Pros & Cons
Strengths
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Strong power output: 2025 BMW R 12 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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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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Age-related wear: As with any used R 12 S, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.
Wear Points & Servicing Notes
Heat management in traffic
R 12 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 Twin disc brake, floating brake discs, diameter 310 mm, 4-piston Monobloc radial brake caliper 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 12 S runs Upside-down 45 mm forks, compression, rebound and spring preload adjustable; and Cast aluminium single swinging arm with BMW Motorrad Paralever; central spring strut, spring preload fully adjustable by hook wrench, adjustable rebound-stage damping 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 220 kg, the R 12 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 12 S - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2025 BMW R 12 S, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained R 12 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 on any R 12 S. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The R 12 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 12 S - Frequently Asked Questions
What engine does the 2025 BMW R 12 S have?
The 2025 BMW R 12 S uses a Four stroke, two cylinder horizontally opposed Boxer, two camshafts and four radially aligned valves per cylinder, central counter balancer shaft. engine with 1170 cc of displacement. It is air/oil cooled.
How much does the 2025 BMW R 12 S weigh?
The 2025 BMW R 12 S weighs 220 kg. This is the manufacturer's wet figure.
How much power does the 2025 BMW R 12 S make?
The 2025 BMW R 12 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 12 S?
The 2025 BMW R 12 S has a 15.9-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 265-318 km between stops.
Is the 2025 BMW R 12 S suitable for shorter riders?
The 2025 BMW R 12 S has a seat height of 795 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2025 BMW R 12 S have?
The 2025 BMW R 12 S uses Twin disc brake, floating brake discs, diameter 310 mm, 4-piston Monobloc radial brake caliper at the front and Single 265 mm disc, 2 piston floating caliper at the rear.
What tyre sizes does the 2025 BMW R 12 S use?
The 2025 BMW R 12 S runs 120/70 - ZR17 front and 180/55 - ZR17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2025 BMW R 12 S have?
The 2025 BMW R 12 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, two camshafts and four radially aligned valves per cylinder, central counter balancer shaft.
Power
81 kW / 109 hp @ 7000 rpm
Torque
115 Nm / 81 lb-ft @ 6500 rpm
Top Speed
Not published by manufacturer
Fuel Capacity
15.9 Litres / 4.2 US gal
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Full 2025 BMW R 12 S Specifications
Year
2025
Make Model
BMW R 12 S
Seat Height
795 mm / 31.3 in
Wheelbase
1511 mm / 59.5 in
Length
2131 mm / 83.9 in
Width
871 mm / 34.3 in
Fuel Capacity
15.9 Litres / 4.2 US gal
Wet Weight
220 kg / 485 lbs
Displacement
1170 cc / 71.4 cub in
Engine Detail
Four stroke, two cylinder horizontally opposed Boxer, two camshafts and four radially aligned valves per cylinder, central counter balancer shaft.
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-59
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
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
Upside-down 45 mm forks, compression, rebound and spring preload adjustable;
Suspension - Rear
Cast aluminium single swinging arm with BMW Motorrad Paralever; central spring strut, spring preload fully adjustable by hook wrench, adjustable rebound-stage damping
Rake
27.7 °
Trail
112 mm / 4.4 in
Wheel Travel - Front
120 mm / 4.7 in
Wheel Travel - Rear
120 mm / 4.7 in
Brakes - Front
Twin disc brake, floating brake discs, diameter 310 mm, 4-piston Monobloc radial brake caliper
Brakes - Rear
Single 265 mm disc, 2 piston floating caliper
ABS
BMW Motorrad ABS Pro, partial integral
Rims - Front
3.50 x 17
Rims - Rear
5.50 x 17
Tyres - Front
120/70 - ZR17
Tyres - Rear
180/55 - ZR17
Wheels
Aluminium cast 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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