Rocky Mountain Insinct Powerplay SL C50 Carbon (2026)

The Instinct Powerplay SL Carbon 50 is a mid-power carbon electric mountain bike. It rides on the 160mm of RockShox Lyrik and 150mm out back. Paired with Rocky Mountain's own Dyname S4 Lite drive with 75Nm, 700W peak, 480Wh removable battery.

Mid-power is the interesting part.

It's roughly four kilos under a full-power e-MTB, which is the difference between a bike you ride and a bike you operate. And it makes a good deal more than the 55–60Nm ultra-lights, which is the difference between a fun climb and a slow one.

Underneath, it's the same bike as the higher level Carbon 70 though. Same premium SMOOTHWALL carbon frame and rear triangle, same drive, same battery, same geometry, same travel.

Where it differs is the parts hanging off it with this build being close to all-Shimano:

XT four-piston brakes, XT shifting, and a drivetrain any shop in the country can service on the spot.

Carbon 50 or Carbon 70?

Most people on this page are deciding between the two, so let's do that first.

The frame is the same.

Both bikes use the identical:

• SMOOTHWALL carbon front and rear triangle
• Dyname S4 Lite drive and 480Wh battery
• Jumbotron and FAST charger
• RIDE-4 chip and reach-adjust headset, the same geometry
• 160/150mm of travel
• 165mm Race Face Turbine cranks and the same Maxxis Minion tyres.

Whatever you pick, the bike underneath you is the same bike.

Four things that do change:

• Fox 36 Float EVOL GRIP X Factory and Fox Float X Factory rear shock
• SRAM Maven Silver 4-piston, metal pads
• SRAM Eagle 90 Transmission, GX 10–52T
• DT Swiss H1900, e-bike rated, steel freehub
• OneUp V3 dropper post

The drivetrain is the real upgrade.

Eagle 90 on the C70 is full Transmission. It bolts to the frame through the UDH interface with no derailleur hanger, never needs indexing, and shifts cleanly with the motor pulling hard.

XT hangs off a conventional hanger.

It shifts beautifully and it's the most serviceable drivetrain in Australia, but the hanger is a genuine weak point on a heavy bike, and under-load shifting matters more with a motor than without one. If one thing pushes you to the C70, it should be this.

The wheels are the second upgrade.

Same 30mm rim width either way, and the C50's DT Swiss Competition spokes are proper double-butted spokes rather than the plain wire you often get at this level.

But the C70 steps up to DT's H1900. It's a wheelset built specifically for e-bike torque, with a steel freehub body.

The brakes are a choice.

Maven is the most powerful trail brake SRAM makes and has better stopping power than the XT on a long, steep descents. XT four-piston has the better-known modulation. Plenty of riders would take the XT knowingly.

The suspension is a brand preference more than a tier jump.

Fox Factory gives you Kashima and more damper adjustment. The C50's Lyrik is the newer design at a lower trim.

RockShox's redesigned chassis with the LinearXL air spring. And both are serviced easily here. If you already know which brand you get on with, that decides it.

The C70 is the one if you ride long descents hard, or if a broken hanger mid-ride is your idea of a bad day. The C50 gets you the identical frame, drive and battery with Shimano parts you can service anywhere.

What you notice riding the Dyname drive

Rocky Mountain build their own motor.

Every other major brand fits Bosch, Shimano, Brose or DJI.

That's unusual enough on its own, but the reason to care is that it behaves differently on the trail, in three ways you'll pick up in the first ten minutes.

It doesn't fight you when the assist stops.

Australian e-bikes cut out at 25 km/h. On a normal mid-drive the motor's output shaft is your bottom bracket, so past the cut-off you're turning its internal gearing along with the chain.

The Dyname sits off the crank axle and feeds the chain through an idler pulley instead, so your legs and the motor are on separate paths. Over the cut-off, it's just a bike.

It's quiet on the way down.

Nothing is spinning behind the chainring on a descent, so you get none of the drivetrain whine that gives most e-MTBs away.

The power arrives immediately.

Most systems work out how hard you're pedalling with strain gauges and software. The Dyname measures chain tension. A mechanical reading of a mechanical thing.

And the practical result is assist that shows up the instant you load the pedal rather than a beat afterwards. It's also tuned to make its peak at low cadence, which is exactly where a steep, awkward climb leaves you.

The motor itself weighs 2.3 kg. A few hundred grams under the full-power units it matches on torque, and a large part of why this bike lands where it does on the scales.