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Talk to a spin bike specialist| Resistance | 16 levels of automatic magnetic resistance |
| Flywheel | 12 kg commercial grade |
| Drive system | Belt Drive |
| Programs | 16 Resistance Levels |
| Max user weight | 140 kg |
If you ride 30 to 60 minutes several times a week and want the console to set your intensity, the SM420 runs 16 levels of automatic magnetic resistance you dial through the LCD console. A 12 kg commercial flywheel and belt drive keep the pedal stroke smooth and quiet enough to ride while the house sleeps.
It suits taller and shorter riders in the same household, with a seat that adjusts from 82 cm to 106.5 cm plus fore and aft, and the commercial-grade steel frame holds users up to 140 kg. Transport wheels and floor levellers mean you can wheel it out for a session and roll it back against the wall after.
What sets this one apart is the automatic magnetic resistance: 16 levels you shift at the touch of a button, and a 12 kg flywheel that keeps every pedal stroke smooth.
The hand-pulse sensors give a rough reading only, so pair a device on the holder for tracking. The 5-year frame warranty tells you they expect this to last.
Adela Ledvinkova · Bachelor of Exercise & Sport Science · Our In-House Fitness Coach
Magnetic resistance adjusts electronically at the push of a button, so you can climb through 16 levels without reaching down to twist a friction knob mid-ride.
Because nothing physically touches the flywheel, the resistance stays consistent as you fatigue and there are no brake pads to wear out.
What this means for you: You can run interval sessions and hill climbs by changing levels on the fly, without breaking rhythm.
The frame is built from commercial-grade tubular steel, which keeps the bike planted when you stand up out of the saddle to sprint.
A steady frame is the first thing I check on a spin bike, because flex under load is what makes a bike feel cheap.
What this means for you: It holds firm through hard efforts, so your energy goes into the pedals rather than into rocking the frame.
A 12 kg flywheel carries enough momentum to smooth out the dead spots in your pedal stroke, so the ride feels road-like rather than jerky.
It pairs with a belt drive system, which runs quietly and needs no chain lubrication.
What this means for you: Quiet enough to ride early morning or late at night without waking the house.
The large LCD console shows the numbers that actually guide a ride, so you can pace by time, distance or speed instead of guessing.
In-built hand-pulse sensors on the handlebars give a heart-rate reading during the session.
What this means for you: The hand sensors handle casual use, but pair a chest strap (around $80) for accurate HR zones on weight-loss sessions.
The seat adjusts up and down as well as fore and aft, and the handlebars adjust up and down, so you can dial in a fit that keeps your knees and back happy over long rides.
That range also lets more than one person in the house share the bike without a rebuild each time.
What this means for you: Getting the fit right is what stops the aches, so take a few minutes to set saddle height level with your hip.
The Comfort Sports Saddle uses a PU leather cover with a wider, cushioned profile, which takes some of the sting out of longer sessions when you are new to spin.
It sits on the same fully adjustable post, so you can fine-tune the position to suit your ride.
What this means for you: If you ever want a race-style feel later, most saddles use a standard rail so it swaps out easily.
A device holder sits on the handlebars so you can prop up a tablet or phone at eye level and follow a class or watch something to pass the time.
There is also a drink bottle holder within easy reach for staying hydrated through a session.
What this means for you: Following an online ride is one of the best ways I've seen new clients stay consistent through the first month.
The pedals are aluminium alloy with toe clips, so you can cinch your feet in and pull up through the back of the stroke as well as pushing down.
That gives you a more efficient, connected pedal action without needing dedicated cycling shoes.
What this means for you: Snug the clips so your foot is held but not pinched, and you'll get a smoother, more powerful stroke.
Built-in transport wheels let you tip and roll the 40 kg bike into a corner between rides, and floor levellers steady it on uneven flooring.
Setup is a one-person job, around 30 to 45 minutes for a first build with the included allen key and spanner.
What this means for you: Handy if the bike lives in a shared space and needs to tuck away when it's not in use.
| Resistance Type | 16 levels of automatic magnetic resistance |
| Flywheel | 12 kg commercial grade |
| Drive System | Belt drive system |
| Max User Weight | 140 kg |
| Seat Adjustment | Comfort Sports Saddle (PU leather), adjustable up/down and fore/aft |
| Handlebar Adjustment | Adjustable up/down, with in-built hand-pulse sensors and device holder |
| Console / Display | Large LCD display |
| Pedals | Aluminium alloy with toe clips |
| Assembled Dimensions | 105.6 cm (L) x 54 cm (W) x 105.8 cm (H) |
| Product Weight | 40 kg |
| Warranty | 5 years on frame, 12 months parts replacement |
| Frame | Commercial-grade tubular steel |
| Cranks | 3-piece forged steel |
| Workout Data | Resistance Level, Time, Distance, Calories, Speed |
| Features | Transport wheels, floor levellers |
| Accessories | Drink bottle holder, device holder |
| Seat Height Range | 82 cm - 106.5 cm |
| Seat to Handlebar Range | 61 cm |
| Gross Weight | 46 kg |
Effort: a one-person job, around 30 to 45 minutes for a first build. Tools: a allen / hex key and spanner / wrench (bolts and fixings are included).
You set the level from the console rather than twisting a knob. The SM420 gives you 16 levels of magnetic resistance, adjusted electronically, so you can jump from an easy warm-up to a hard climb at the press of a button. Magnetic resistance also runs quieter than felt-pad brakes and needs no maintenance, since nothing physically touches the flywheel.
The belt drive and magnetic resistance make this one of the quieter setups you can ride. There's no chain slap and no brake pad friction, just a low hum from the 12 kg flywheel. It's fine for a spare room while the household sleeps. On upstairs floors, a 6 mm rubber mat under the bike reduces vibration transfer to the room below.
The seat adjusts from 82 cm to 106.5 cm and moves fore and aft, plus the handlebars adjust up and down, so it suits a wide range of riders. Maximum user weight is 140 kg. With commercial-grade steel and a 12 kg flywheel, it's built for regular indoor cycling training, from beginners finding their feet to experienced riders chasing structured sessions.
The built-in hand-pulse grips give you a rough heart-rate read for casual sessions. Honestly, they're not reliable for interval work, since you have to hold the bars still and you'll be moving. If you want to actually train at the right aerobic intensity, pair a chest strap (around $80) for accurate HR zones. Use the grips as a rough guide only.
The assembled footprint is 105.6 cm long by 54 cm wide, and it stands 105.8 cm tall, so it slots into a spare corner or a shared room without dominating it. Height is well under a standard ceiling. Built-in transport wheels let you tilt and roll it out of the way when you're done, and the floor levellers keep it steady on uneven surfaces.
It's a one-person job, around 30 to 45 minutes for a first build. You'll need an allen (hex) key and a spanner, and the bolts and fixings all come in the box. The heavier work is lifting the main frame into position, so clear a bit of floor space first. Nothing fiddly here, most people have it ready to ride in under an hour.
You get 5 years on the frame and 12 months parts replacement, handled locally by us rather than by an overseas manufacturer. If a covered part fails, contact our team and we'll sort the replacement and stay across it. It's also covered by our 100-day money-back guarantee if it's eligible, so you can try it and return it if it isn't right.
Take photos before you unpack and email them to support@cardioonline.com.au within 48 hours of delivery. We'll lodge any freight claim, organise replacement parts or a full unit, and stay across it until you're riding. You don't chase the courier or the manufacturer yourself, that's our job to handle from start to finish.
Click below to download the user manual.
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Try it for 100 days. Return it if it is not right.
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