The Sinnis Terrain 125 weighs ~162kg wet (estimated), has a seat height of 780mm and 158mm of ground clearance, and makes 12.7hp. Expect Not officially published, for a range of Not officially published from its 14-litre tank.
2/10
Holloway Green Lane Score
A cheap, well-equipped 125 with 17-inch wheels that suits easy gravel and dry byways, but it is heavy for its power and not a mud bike. Rider ability, terrain, weather and tyre choice still move the real answer more than the bike alone does.
About £3,000 to £3,600Price guide
~162kgWet weight
780mmSeat height
Not officially publishedReal-world range
Holloway ratings
Four separate scores, not one blended number, so you can see what's actually driving it.
Beginner friendliness
5/5
Road usability
1/5
Technical off-road capability
1/5
Green-lane suitability
1/5
Full specs
PriceAbout £3,000 to £3,600 (UK sources disagree, check with a dealer)
Engine125cc
Power12.7hp
Torque10.5Nm
Weight (wet)~162kg (published figure, wet or dry not stated)
Seat height780mm
Fuel tank14L
Real-world rangeNot officially published
EconomyNot officially published
Wheels (f/r)17" / 17"
Ground clearance158mm
Suspension travel (f/r)Not officially published
ABSNo
Traction controlNo
Ride modesNo
Service intervalCheck the handbook
Licence requiredA1
Stock tyre sizes (f/r)100/80-17 / 120/80-17
Where the Sinnis Terrain 125 sits
Wet weight against ground clearance for every bike in the finder that publishes both. Light and tall, top left, is where the easiest green lane bikes sit. Tap a dot to open that bike.
Figures are manufacturer claims. Clearance is measured differently by different makers, so treat small gaps as a draw.
Will your feet reach?
The Sinnis Terrain 125 has a 780mm seat. Enter your inside leg for a rough idea of how much foot you'll get down when stopped.
A rough guide only. A wide seat needs more leg than a narrow one, the suspension settles 20 to 40mm under you, and boots add a little. Many bikes offer a low seat or lowering link. Sit on one before you buy.
Tyres that fit the Sinnis Terrain 125
It runs a 100/80-17 front and a 120/80-17 rear. None of the tyres in our Tyre Finder are listed in these sizes yet.
Sizes are for the standard UK model and can change between model years. Check the size on your own tyre sidewall, and ask your dealer before fitting a different size. Our size lists come from maker and retailer listings and can miss sizes, so a tyre shown for one end may still be made in your other size. Check the maker's size chart.
The Terrain 125 is the sensible budget pick for A1 riders who want to try dry, easy byways. It looks like a small adventure bike, comes with panniers and a top box in some trims, and costs a fraction of a Japanese 125 trail bike. Reviewers describe it as comfortable and easy to ride, but heavy at 162kg, sluggish above 45mph, and with a realistic top speed around 60mph. The 17-inch wheels and 158mm ground clearance put it in the light gravel class rather than the deep rut class.
Pros for green laning
Low price: reviewers quote around 3,000 pounds, a fraction of a Yamaha or Fantic 125.
Low seat: a 780mm seat height (reviewers measured about 800mm) lets most riders put a foot down in a gateway.
Luggage ready: Lexham reports 66.5 litres of storage in its test bike set-up, useful for a day of lanes and spares.
Easy to ride: reviewers praise the light clutch, smooth gearbox and comfortable, upright seat.
Cons and limitations
Heavy for 12.7hp: at 162kg it is hard work to move in deep mud or a rutted climb, and reviewers call it sluggish above 45mph.
17-inch wheels: road-biased 100/80-17 and 120/80-17 sizes limit tyre choice and grip in mud compared with 21 and 18-inch off-road wheels.
Modest ground clearance: 158mm means deep ruts and rocky steps are best avoided.
Build quality questions: Lexham saw wear on the side stand, centre stand and exhaust during its test, and found the indicators flimsy.
Before taking it seriously off-road: A bash plate and handguards, sturdier indicators if you drop it, a real-world check that you can live with a top speed near 60mph on road links, and the willingness to stick to dry, easy byways until you upgrade the tyres.
Remember: a rank here assumes reasonable stock tyres and a competent rider in decent conditions. The right tyres, or the wrong weather, can move a lane from easy to genuinely hard regardless of what bike you're on. Check a lane's own difficulty and hazards on the map before you go, don't rely on a bike score alone.
Find where to actually ride it
Browse legal green lanes and byways across England and Wales, filtered by difficulty, on Holloway's map.
