The chassis can handle way more than the 50cc lump will ever be able to throw at it, and as such it's great fun keeping the momentum up in corners. The suspension may be non-adjustable but it copes fine with hard cornering and braking.
No amount of throttle or clutch slip will ever get the Aprilia off the line quickly, from then on up, however, it's a gas. Gather a bit of momentum and things get much better. Despite the single figure power output, the light, well-spaced gearbox helps keep the tacho needle firmly in the top half of the rev counter. Expect to see 60mph in top gear with the right conditions.
If you buy a second hand SX50 then chances are it's spent most of its life being ridden hard by a 16-year-old who only put cheap oil in it. Check for signs it's not been looked after.
At £2399 the SX was cheaper than the RS50 but offers the same performance. If you really want to look after it you'll have to use top quality two-stroke oil, which isn't cheap.
In 2019 you could still buy the SX 50, priced at £3499. It was available in red and green colour schemes.
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As you'd expect on a supermoto, equipment is basic, with only the bare essential clock functions and non-adjustable suspension. But you don't really need anything else.