WK BIKES SM50 (2011-on) Review

Published: 10 June 2011

50cc supermoto 50 made in Taiwan and branded 'WK' in UK


50cc supermoto 50 made in Taiwan and branded 'WK' in UK

  • At a glance
  • 49cc  -  3 bhp
  • 72 mpg  -  112 miles range
  • Medium seat height (760mm)
  • New: £2,099

Overall Rating 4 out of 5

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.

Ride Quality & Brakes 4 out of 5

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.

Engine 4 out of 5

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.

Build Quality & Reliability 3 out of 5

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.

Insurance, running costs & value 4 out of 5

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.

Equipment 4 out of 5

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.

Owners' Reviews

No owners have yet reviewed the WK BIKES SM50 (2011-on).

Review your WK BIKES SM50 (2011-on)

Facts & Figures

Model info
Year introduced 2011
Year discontinued -
New price £2,099
Used price -
Warranty term Two year unlimited mileage
Running costs
Insurance group -
Annual road tax £17
Annual service cost -
Max power 3 bhp
Max torque 6.2 ft-lb
Top speed 30 mph
1/4-mile acceleration -
Average fuel consumption 72 mpg
Tank range 112 miles
Engine size 49cc
Engine type Single cylinder liquid cooled 2 stroke
Frame type Steel cradle
Fuel capacity 7 litres
Seat height 760mm
Bike weight 96kg
Front suspension Non-adjustable telescopic forks
Rear suspension Single rear shock, adjustable for preload
Front brake Single 300mm disc with twin-piston radial caliper
Rear brake 160mm drum
Front tyre size 110/80-17
Rear tyre size 130/70-17

History & Versions

Model history

Model introduced in 2011

Other versions


Photo Gallery

  • WK SM50
  • WK SM50
  • WK SM50
  • WK SM50
  • WK SM50
  • WK SM50
  • WK SM50
  • WK SM50
All related reviews