APRILIA SX125 (2018 - on) Review
- Learner-friendly 125cc supermoto
- Mechanicals based on popular RS 125
- Soft, forgiving suspension
At a glance
|Owners' reliability rating:|
Overall ratingNext up: Ride & brakes
The Aprilia SX 125 immediately found itself in a gap in the market, which used to be packed with learner-legal enduro or supermoto 125s (Suzuki DR125SM, Yamaha XT125R and Yamaha XT125X), but nowadays none of the ‘recognised’ brands build one and instead have focused their attention on race reps and naked bikes. A move that has left the door open for Aprilia…
New in 2018, the supermoto Aprilia SX 125 and enduro RX 125 share a similar platform. Both bikes use the RS 125’s (or RS4 as it used to be called) fuel-injected, four-stroke, single cylinder engine that is housed in a steel double cradle frame. Boasting inverted forks, ABS, and smatterings of real-fake carbon fibre, not to mention typically-Aprilia aggressive styling, they look far more premium products than their impressively budget £3399 price tags suggest. Are Aprilia onto a winner by spotting this hole in the 125cc market?
The SX 125 has a ‘big bike’ feel about it and while the seat height is quoted at 880mm, it’s such a narrow machine with soft suspension that in reality it’s far lower. The riding position is relaxed with tall bars, which is good, but the seat is pretty firm. While the engine’s weedy exhaust note is a disappointment, it’s as fast as any four-stroke 125 with solid road holding meaning you can happily top 60mph, which is all you need. My only real criticism was the cheap dash, which lacks a fuel gauge and looks like it came out of a cracker.
You always expect an Aprilia model to cost a premium, but launched at £3399 the SX was impressive value for money and backed up by some tempting finance deals, which you don’t always get with far eastern brands. However, fast-forward to 2021 and the price has risen to £3895.
The aggressive look and relaxed riding position that a supermoto style of bike delivers is good and the fact the SX comes with ABS is a bonus.
Ok, it’s made in China and not Italy, but it’s the name on the tank that counts and the Aprilia brand still carries some weight behind it.
The SX looks fantastic in the flesh and fits all shapes and sizes of rider, even those who have been through a recent growth spurt/McDonalds binge. The little single engine is reliable and sips fuel with 80mpg easily achievable, making the SX cheap to run on a shoestring. It sounds a bit puny, but that’s nothing a loud exhaust can’t rectify.
Ride quality & brakesNext up: Engine
The Aprilia has a ‘big bike’ feel about it and while the seat height is quoted at 880mm, it’s such a narrow machine with soft suspension that in reality it’s far lower. The riding position is relaxed with tall bars, which is good, but the seat is pretty firm. There are better handling 125s on the market (KTM 125 Duke) but overall the SX doesn’t disappoint and it’s a good little 125 and ideal for commuting or shorter runs. The ABS system works well, giving newer riders a greater feeling of security than combined brakes deliver. And the rear brake has no ABS, so you can still do skids to impress people…
EngineNext up: Reliability
The SX use the same four-stroke single cylinder 125 as the RS 125, which is a pretty advanced engine. It has four valves, double overhead cams and a fuel-injection system, so meets Euro4 regulations. Despite sounding pretty weedy, it makes the legal limit for a 125 and is impressively frugal to run with 80mpg easily achievable.
Reliability & build qualityNext up: Value
By their very nature 125s get hammered to within an inch of their life, but as new you get a two-year warranty and the RS4 (which is now called the RS 125) has a proven reliability record. The lower level of finish tends to show up after a few years, but mechanically it should be sound.
Our Aprilia SX 125 owners' reviews show a few issues with build quality that we think you should consider before buying one.
Value vs rivalsNext up: Equipment
If you are comparing the SX to far eastern brands the Aprilia is more expensive, and the likes of the Keeway TX 125 Enduro or SM and Lexmoto Adrenaline and Lexmoto Tekken all cost £1999. The air-cooled Rieju MRT 125 Pro is £2999 while a water-cooled version £4099, which is more than the also water-cooled SX. The Japanese ‘big four’ seem to have abandoned the supermoto/enduro 125 market in favour of the naked/race rep, so if you want a recognised brand, it’s the Aprilia or nothing and at £3399 it’s good value. Although it is actually also Chinese-built, unlike the Aprilia RS 125…
Unlike some cheap 125s, which have a combined braking system to pass Euro4 regulations, the SX has a Bosch ABS system on its front brake, which automatically reduces pressure to keep the bike level when braking hard, cutting out stoppies. It’s a neat system and works well, giving newer riders a greater feeling of security than combined brakes deliver. The rear brake has no ABS, so you can still do skids outside the youth club…The SX’s overall look is premium and it has inverted forks, however the LCD dash is cheap and nasty and a radial brake caliper would have been nice on the supermoto.
|Engine type||Liquid-cooled, 4v, DOHC single|
|Frame type||Double cradle steel frame|
|Fuel capacity||7.5 litres|
|Front suspension||41mm, inverted forks, non-adjustable|
|Rear suspension||Single rear shock, adjustable preload|
|Front brake||1 x 300mm disc with two-piston caliper|
|Rear brake||220mm single disc with single-piston caliper|
|Front tyre size||100/80 x 17|
|Rear tyre size||130/70 x 17|
Mpg, costs & insurance
|Average fuel consumption||80 mpg|
|Annual road tax||£20|
|Annual service cost||-|
|Used price||£3,200 - £3,900|
How much to insure?
|Warranty term||Two years|
Top speed & performance
|Max power||15 bhp|
|Max torque||7.7 ft-lb|
|Top speed||65 mph|
|1/4 mile acceleration||-|
|Tank range||130 miles|
Model history & versions
The Aprilia SX 125 and RX 125 are new models for 2018. They are four stroke iterations of the two stroke Aprilia SX 125 and Aprilia RX 125 machines Aprilia made up until 2011.
The RX 125’s styling is more off-road orientated and as such it comes with a 21-inch front wheel (with a smaller 260mm wave disc) and 18-inch rear with chunky CST tyres. But other than wheels and a taller 905mm seat height, the SX and RX are identical and share the same £3399 price tag.
Owners' reviews for the APRILIA SX125 (2018 - on)
1 owner has reviewed their APRILIA SX125 (2018 - 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.
Summary of owners' reviews
|Ride quality & brakes:|
|Reliability & build quality:|
|Value vs rivals:|
Looks good but is Chinese
Abs works well
Engine cylinder rusting already along with the rear silencer
Water pump failed at 8 months local dealership less than helpful at getting it in quickly, one week later the coolant reservoir fluid is black and it is leaking from the engine casing again
Dealership less than helpful when trying to book it in around work
Buying experience: Not very helpful will not recommend to anyone