BMW G310 R revealed

Production version of BMW's 313cc single-cylinder concept finally debuts

HERE’S BMW’s G310 R, the production version of the single-cylinder roadster we’ve seen in spy shots and as a concept.

The product of a partnership with Indian manufacturer TVS, it's got a 313cc engine with a back-to-front cylinder, the exhaust exiting from the rear, and making a claimed 34hp and 20.6lbft. 

That's up on some of the similarly-sized single-cylinder competition, like Honda's CBR300R, at 30hp. But it's about 10hp down on KTM's RC 390 and Duke 390 and Yamaha's parallel-twin YZF-R3, probably the most exciting current offerings in the sub-500cc market. 

Honda has also revealed a new twin-cylinder CBR250RR concept, so the question for BMW's long-awaited first assault on the sub-500cc sector could be: is it enough already?  

The claimed top speed is 90mph and fuel economy 84.8mpg. The 'road-ready' claimed weight is 158.5kg. 

It's got a tubular steel frame, upside-down fork and aluminium swing-arm. It comes with ABS as standard, delivered through a radial-mounted four-piston caliper biting a single front disc. 

The seat height is 785mm and BMW says the styling echoes the S1000R. See a full gallery of pictures below. 

Price is to be confirmed. 

The G310 R was revealed this afternoon in a press release. Here's the tech specs taken from that release:

Engine capacity: 313cc

Bore/stroke 80/62mm

Output: 34hp @ 9,500rpm

Torque: 20.6lbft @ 7,500rpm

Type: liquid-cooled single-cylinder engine

No. of cylinders: 1

Compression/fuel: 10.6:1 / premium unleaded (95 RON)

Valve/accelerator actuation: DOHC

Valves per cylinder: 4

Intake/outlet: 33.5/27.2mm

Throttle valves: 42mm

Engine control: BMS-E2

Emission control: closed-loop 3-way catalytic converter

Alternator: 330W

Clutch: Multi-plate wet clutch

Gearbox: constant-mesh 6-speed

Rear wheel drive O-ring chain

Frame construction type: Tubular steel frame in grid structure with bolt-on rear frame

Front wheel suspension: Telescopic fork, Ø 41mm

Rear wheel suspension: Aluminium swinging arm in conjunction with a directly-mounted spring strut

Total spring travel, front/rear: 140/131mm

Wheelbase 1,374mm

Steering head angle:  64.9° 

Brakes front: Single-disc brake 300mm

Rear: Single-disc brake 240mm

ABS: BMW Motorrad ABS

Wheels: 5-spoke light alloy die-cast

Front: 3.0 x 17"

Rear: 4.0 x 17"

Tyres front: 110/70 R 17

Tyres rear: 150/60 R 17

Dimensions and weights:

Total length: 1,988mm

Total width with mirrors: 896mm

Seat height: 785mm

DIN unladen weight, road ready: 158.5kg

Permitted total weight: 345kg

Fuel tank capacity: 11 litres

Performance figures

Fuel consumption: 84.8mpg

Top speed: 90mph

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