Rocky Mountain Instinct Powerplay SL A50 Alloy (2026)

The Instinct Powerplay SL Alloy 50 is the way into Rocky Mountain's mid-power e-MTB platform without the carbon frame. 160mm of RockShox Lyrik up front, 150mm out back, and the same Dyname S4 Lite drive system the carbon bikes get: 75Nm, 700W peak, 480Wh removable battery.

That last part is the whole point.

On most ranges, the cheaper bike gets the cheaper motor. Here it doesn't. The drive system, the battery, the Jumbotron display and the charger are identical from this bike to the top of the range. You're buying the same power, the same range and the same electronics on a FORM alloy frame instead of a carbon one.

The rest of the build is close to the Carbon 50 as well:

Same Lyrik fork, same Shimano XT shifting, same wheels, same tyres, same cranks, same dropper.

What going alloy actually costs you

Worth being specific, because the honest answer is "less than you'd think."

Identical to the Carbon 50:

• RockShox Lyrik Select fork
• Shimano XT shifter and derailleur, the Deore 10–51T cassette and chain
• WTB KOM Trail i30 wheels on Novatec hubs with DT Competition spokes
• Maxxis Minion tyres
• Race Face Turbine cranks, the TranzX +RAD dropper, and the Rocky Mountain bar, stem and grips.

Also identical:

• The Dyname drive
• 480Wh battery
• Jumbotron, the FAST charger, RIDE-4 and the reach-adjust headset function.

Moving up to the Carbon 50, this is what changes:

• SMOOTHWALL carbon, carbon rear triangle
• RockShox Super Deluxe Select+
• Shimano XT Trail 4-piston
• FSA Orbit No.85 reach adjust
• WTB Volt Fusion Form

Weight is the main one.

Rocky don't publish figures, but reviewers who've had both on the scales put the alloy roughly 1.5 to 2 kg over the carbon. Call it around 21 kg against a carbon bike's 20.

On a bike with a motor, that's a smaller proportional difference than it would be on an analogue trail bike. And it's mostly frame weight sitting low and central rather than out at the ends.

The shock is the difference that changes how it rides.

Select+ carries more adjustment than the plain Select. You still get a well-supported shock with a sealed bearing eyelet; you get fewer dials to set it up with.

The brakes are important.

MT6120 is Shimano's non-series four-piston brak. The same four-piston architecture and the same pads as the Deore-level stoppers. But without XT's lever refinement or free-stroke adjustment.

It has real power and it's serviced everywhere in the country. If you ride long, steep descents regularly, it's the first thing on this bike we'd upgrade, and it's a cheap upgrade to make later.

What doesn't change: the geometry, the travel, the adjustability and — most importantly — the motor and battery. This is not a de-tuned version of the bike above it.

The Dyname drive

Rocky Mountain build their own e-MTB motor. Every other major brand fits Bosch, Shimano, Brose or DJI.

And on this range, the alloy bike gets exactly the same one as the flagship. Same 75Nm, same 700W peak, same 480Wh battery, same display, same charger.

It's also built differently from anything else you'll ride.

A conventional mid-drive is built around your bottom bracket.

The motor's output shaft is the crank axle, so its gearing turns whenever your legs do. The Dyname sits off the crank axle and feeds the chain through an idler pulley, keeping your legs and the motor on separate paths.

What that means on the trail:

• Past 25 km/h, it gets out of the way. Australian e-bikes stop assisting there. On most, everything beyond the cut-off is you dragging a gearbox. Here, it's a bike.
• It's quiet going down. Nothing spinning behind the chainring on a descent.

The assist arrives immediately.

Most systems infer your effort from strain gauges and software. The Dyname measures chain tension. It's a mechanical reading of a mechanical thing and it's tuned to peak at low cadence, which is exactly where a steep, awkward climb leaves you.

Range from 480Wh

German testing site emtb-test.com runs every motor through the same standardised climb (sealed road, 100 kg of bike and rider, maximum assist). The Dyname covered 1,375 vertical metres on one charge, about 130 metres further than a Bosch SX on the same test from the same battery capacity.

That's a comparison figure, not a trail figurethough.

On dirt, with real stopping and starting, it'll be less. What it tells you is that on identical terms, this system stretches a small battery further than the obvious alternative.

On real rides, owners report five-plus hours of moving time mixing assist modes on rolling trail, or a comfortable two after-work laps between charges. Ride everything in the top mode and it's closer to two hours.

The battery comes out on two bolts so it charges anywhere, the FAST charger refills it in under three hours, and the optional Overtimepack 2.0 adds 314Wh on the downtube for 794Wh all up.

The frame and how it's set up

FORM alloy, front and rear triangle.

Rocky's alloy tubeset, hydroformed and butted for the job rather than drawn straight.

It carries the same architecture as the carbon frames; mid-high pivot Smoothlink, RIDE-4 adjustment, integrated display, press-fit BB, 150mm of rear travel on the same shock stroke.

The frame material is the variable here, not the suspension design.

Smoothlink is a four-bar Horst link with the main pivot raised. That gives the rear wheel a rearward axle path. It moves back as well as up, so it can move away from a square-edged hit rather than being driven into it. It's what riders mean when they say a high-pivot bike erases brake bumps, and it shows up most in braking chatter and long rooty straights. The trade-off is chain growth, handled by the idler — the same idler the motor drives through.

Three adjustments worth using:

RIDE-4 uses one rotating chip, one Allen key, four geometry positions. Head angle, seat angle and BB height, changed in about a minute.

Reach-adjust headset has neutral cups fitted, ±5mm cups in the box. A 10mm window without touching the stem, which matters because changing stem length changes the steering along with the fit. It's the thing that resolves being caught between sizes, and it's not something you usually find on an alloy bike at this end of a range.

Proportional rear centre. The chainstays get longer as the frames get bigger, so every size sits the rider in the same place between the wheels.

Most brands run one length across the range and the big sizes handle differently as a result.

The Jumbotron on the top tube covers the rest.

Assist level, battery, speed, cadence, trip, and power delivery you customise on the bike with a tap. No app, no pairing, no firmware surprise at the trailhead.

The build

RockShox Lyrik Select, 160mm. The same fork as the Carbon 50. A 160mm all-mountain chassis on 35mm stanchions. The stiffness a bike carrying a motor needs, and serviced by every suspension shop in the country.

RockShox Super Deluxe Select. Sealed bearing eyelet to cut breakaway friction. Fewer adjusters than the Select+ on the carbon bike, but well-matched to the frame and easy to get serviced.

Shimano MT6120, four-piston, metal pads. Shimano's non-series four-piston brake. Real stopping power from a four-pot caliper, metal pads from new for fade resistance on long descents. It gives up lever refinement and adjustment to XT rather than giving up power.

Shimano XT 12-speed, Deore 10–51T cassette. XT shifter and rear derailleur are the parts that decide how it shifts, with a Deore cassette and chain. Fully cross-compatible Hyperglide+, 510% range, and the all-steel Deore cassette is arguably tougher under e-bike torque than XT's lighter build.

WTB KOM Trail i30 TCS 2.0 rims, DT Swiss Competition spokes. 30mm internal and tubeless-ready, properly supporting a 2.4–2.5" tyre. The spokes are worth noting. DT Competition is a double-butted spoke, and it does more for how long a wheel stays true than the rim usually does.

Maxxis Minion DHF 2.5 / DHR II 2.4, EXO+. The default competent trail pairing, and the same rubber the carbon bikes get. If you ride rocky ground hard, a tougher rear casing or an insert is the cheapest worthwhile change you can make.

Race Face Turbine Cinch cranks, 165mm in every size. Short cranks are standard on e-MTBs now. Fewer pedal strikes, and you keep pedalling through terrain where 175s would be clipping rocks.

TranzX +RAD 2.0 dropper, 150–230mm by size. The +RAD part is the useful part. The drop is adjustable through a 30mm range, so you set the post to your legs rather than accepting whatever your frame size ships with. The I-Spec EV lever clamps to the brake to keep the bar tidy.