WK BIKES SM50 (2011 - on) Review

At a glance

Owners' reliability rating: 5 out of 5 (5/5)
Annual servicing cost: £150
Power: 3 bhp
Seat height: Low (29.9 in / 760 mm)
Weight: Low (212 lbs / 96 kg)


New £2,099
Used N/A

Overall rating

Next up: Ride & brakes
4 out of 5 (4/5)

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

Next up: Engine
4 out of 5 (4/5)

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.


Next up: Reliability
4 out of 5 (4/5)

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.

Reliability & build quality

Next up: Value
3 out of 5 (3/5)

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.

Value vs rivals

Next up: Equipment
4 out of 5 (4/5)

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.


4 out of 5 (4/5)

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.


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

Mpg, costs & insurance

Average fuel consumption 72 mpg
Annual road tax £25
Annual service cost £150
New price £2,099
Used price -
Insurance group -
How much to insure?
Warranty term Two year unlimited mileage

Top speed & performance

Max power 3 bhp
Max torque 6.2 ft-lb
Top speed 30 mph
1/4 mile acceleration -
Tank range 112 miles

Model history & versions

Model history

Model introduced in 2011

Other versions


Owners' reviews for the WK BIKES SM50 (2011 - on)

1 owner has reviewed their WK BIKES SM50 (2011 - on) and rated it in a number of areas. Read what they have to say and what they like and dislike about the bike below.

Review your WK BIKES SM50 (2011 - on)

Summary of owners' reviews

Overall rating: 5 out of 5 (5/5)
Ride quality & brakes: 5 out of 5 (5/5)
Engine: 5 out of 5 (5/5)
Reliability & build quality: 5 out of 5 (5/5)
Value vs rivals: 5 out of 5 (5/5)
Equipment: 5 out of 5 (5/5)
Annual servicing cost: £150
5 out of 5
15 February 2016 by bikemad32

Year: 2013

Annual servicing cost: £150

WK Bikes service is unbeatable

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5

Had this bike from new and it's now 3 years old. I just think other people pay £1k for a bike and expect to never service it! Never had an issue with the bike, it's got 22,500 on the clock now and still runs perfectly.

Value vs rivals 5 out of 5

- usual servicing costs at any motorcycle garage, depends on mileage

Equipment 5 out of 5

Buying experience: My local WK dealer went above and beyond for us. I'll never touch another brand now.

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