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WK SM50 (2011-current)

Detail	Value
New price	£2,099
Used price range	View White Knuckle SM50 bikes for sale to see current asking prices
Engine size	49cc
Power	3bhp
Top speed	30mph
Insurance group

	MCN ratings	Owners' ratings
Overall
Engine
Ride & Handling
Equipment
Quality & Reliability
Value

MCN overall verdict

Here’s a bike to make any 16-year-old’s visor steam up: the 500 cc supermoto-styled SM50, made in Taiwan and exclusively branded ‘WK’ in the UK. WK has been set-up by the same UK company who are behind Quadzilla Quads, who’ve been in the learner-legal quad market for over 10 years.

MCN rating
Owners' rating

With a liquid-cooled, 49cc two-stroke single cylinder engine, learner-friendly bikes will be restricted to 2.9bhp and 30mph, but a £60 de-restriction kit is available, which includes different sprockets, carb jets and exhaust gaskets, to unleash 3.6bhp and 65mph.

MCN rating
Owners' rating

The SM50’s taut suspension barely moves under your weight and you sit high in an aggressive ‘elbows-out’ stance. Shorter riders will struggle to get their feet flat on the floor. The chassis is stable and sure-footed enough for the SM50 to fly through most corners without breaking into a sweat or indeed braking. Dry weight is just 95kg, so it’s light and agile and the brakes have decent power, although not enough for proper supermoto-style rolling stoppies.

MCN rating
Owners' rating

The SM50 features aggressive supermoto bodywork, spoked wheels, a funky stainless steel underslung exhaust, blue-anodised Renthal-style aluminium handlebars, wavy brake discs, a digital dash, polished aluminium swingarm, aluminium brake and gear levers and electric start.

MCN rating
Owners' rating

The WK SM50 comes with a 12-month unlimited mileage parts and labour warranty. It’s well built, good fun and deserves to be taken seriously, but only time will tell how durable and reliable it is in the hands of a 16-year-old.

MCN rating
Owners' rating

Well-equipped and is sold with a comprehensive 12 month warranty, the SM50 is priced keenly for a supermoto-style 50 - cheaper than more established European rivals from Aprilia and Derbi, but on par with the Spanish Rieju.

Insurance group: n/a

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Model introduced in 2011

Specifications

Top speed	30mph
1/4-mile acceleration	secs
Power	3bhp
Torque	ftlb
Weight	96kg
Seat height	mm
Fuel capacity	litres
Average fuel consumption	mpg
Tank range	miles
Insurance group

Engine size	49cc
Engine specification
Frame	Steel cradle
Front suspension adjustment	Non-adjustable telescopic forks
Rear suspension adjustment	Single rear shock, adjustable for preload
Front brakes	Single 300mm disc with twin-piston radial caliper
Rear brake	160mm drum
Front tyre size
Rear tyre size