The Rotor 2INpower SL crankset in the spidering version is the lightest dual measurement power meter from Rotor. Available in 5 spidering sizes, it combines the lightweight features of the cranks and the power meter with the reduced weight of the spidering, achieved through machining the chainrings and spider into a single piece. This crankset is positioned as a professional measurement tool, ideal for those who hesitate with Aldhu Carbon Inspider but prefer aluminum cranks for more precision. You'll particularly appreciate its long-lasting battery and Rotor-specific data such as 360° torque.
Rotor 2INpower SL · Spidering version
Genuine independent left/right power measurement, the low weight of precision-machined aluminium, and a rare choice of 48/32 and 48/31 chainring combinations. Made for long mountain climbs, all-day rides and cyclists who want to pace their efforts without carrying unnecessary grams.
The choice that makes the difference
The 2INpower SL Spidering is especially relevant when a conventional 50/34 compact chainset is still too demanding on steep mountain roads. Smaller inner chainrings help maintain a comfortable cadence and keep your effort under control on prolonged climbs.
The 32T inner ring gives you a useful lower gear when the climb seems endless. This is our preferred setup for 11s road drivetrains, subject to front derailleur clearance, capacity and adjustment.
A 31T inner ring lets you maintain a higher cadence at lower climbing speeds. We favour this combination with 12s road drivetrains, once front derailleur capacity and setup have been checked.
Each combination is offered in round (NOQ) or oval Rotor Q-Rings versions, depending on the selected variant and current availability. The familiar 50/34, 52/36 and 53/39 sizes cater to more conventional road riding; here, the outstanding benefit remains a genuine dual-sided power meter in a remarkably light complete crankset.
Rotor's Spidering combines the spider and both chainrings into a single machined assembly. Changing gearing or replacing worn rings means replacing the Spidering assembly.
Machined in Spain
The 7075-T6 aluminium crank arms are extensively CNC-machined. The power-meter technology, 30 mm spindle and rechargeable battery are integrated into the crankset architecture rather than attached as bulky external components.
The direct-mount Spidering reduces intermediate parts and creates a clean finish suited to both a mountain bike build and a performance-oriented road race bike.
Velo-Perso workshop measurement
We weighed the complete crankset at 709 g with 170 mm crank arms and a round 50/34 Spidering. This includes the chainrings, rather than quoting the weight of the crank arms or sensor alone.
This makes the 2INpower SL a highly competitive option for anyone seeking independent power measurement on both legs without a substantial weight penalty.
Actual weight depends on crank length, chainring size and round versus oval design. Our measurement should not be applied to every variation.
Velo-Perso.com's opinion
“This is the only crankset in our range, and one of the few on the market, to combine highly accurate independent left/right power measurement with Spidering combinations smaller than a conventional 50/34 compact. To us, that is its strongest selling point.
We generally recommend 48/32 for 11s and 48/31 for 12s, although both setups can work with either drivetrain when correctly configured. With more traditional gearing, the 2INpower SL becomes less distinctive in terms of chainring choice — but its low weight remains exceptional among true dual-sided crankset power meters.
The substantial 250-hour claimed battery life and the quality of the machined crank arms make it an excellent choice for high mountains and ultra-distance riding: keep your cadence comfortable, pace your efforts by power and minimise unnecessary weight.”
Velo-Perso.com · hand-picked components, technical advice and independent weight checks since 2009
Product video
The original video already featured on this page introduces the Rotor 2INpower SL crankset and its construction. Combine it with our genuine photographs and measured weight for a more complete view before purchasing.
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Understand what you are buying
The system measures the effort from the left and right legs separately. It can help you track power balance and how it changes with intensity, ride duration or fatigue.
INspider measures the total power transferred through the spider and can provide an estimated left/right balance. It does not measure the legs independently, but remains an excellent solution for pacing and overall power analysis.
Compare cycling power-meter technologies in our 2026 guide →
Before you order
BSA, ITA, BB30, BB86/PF86, BB386EVO, BBright, PF30, PF30A or T47: several installations are possible, but a compatible frame standard does not automatically guarantee a trouble-free fit.
The 2INpower SL uses a 30 mm spindle. If you are replacing a 24 mm Shimano crankset, check the correct bottom bracket for your frame, shell width and required spacers. Narrow BB86 shells deserve particular attention.
Small Spidering combinations require careful front derailleur height, capacity and adjustment checks. The 48/31 has a 17-tooth difference between rings; the actual installation must be validated before ordering.
Find a suitable bottom bracket for your bike and 30 mm spindle with the Velo-Perso Bottom Bracket Finder. Effective 11s / 12s road-drivetrain compatibility also depends on the chainrings, chain and front derailleur configuration.
Technical specifications
| Product type | 2x road crankset with genuine independent left/right power measurement |
|---|---|
| Spidering combinations | 48/32 · 48/31 · 50/34 · 52/36 · 53/39 |
| Chainring profile | Round Rotor NOQ or oval Rotor Q-Rings (depending on selected variant) |
| Crank lengths | 165 · 170 · 172.5 · 175 mm |
| Verified weight | 709 g measured by Velo-Perso.com, 170 mm arms, round 50/34 Spidering |
| Claimed accuracy | ±1.5% |
| Available data | Power, cadence, left/right balance, torque effectiveness and pedal smoothness; advanced metrics depend on compatible head units and software |
| Spindle / mounting | 30 mm aluminium spindle · direct-mount Spidering |
| Q-factor | 147.5 mm (manufacturer specification) |
| Chainline | 43.5 mm on the existing product listing; confirm against the actual drivetrain and installation |
| Battery | USB-rechargeable 3.7 V Li-ion · claimed life up to 250 h |
| Wireless connectivity | ANT+ and Bluetooth Smart |
| Water resistance | IP67 |
| Materials | 6082-T6 and 7075-T6 aluminium alloys · CNC machining |
| Road drivetrains | Mainly Shimano 11s and 12s applications; actual compatibility must be checked for the selected chainrings and derailleurs |
| Made in | Spain |
| Package contents | Crankset with selected Spidering, installation spacers, Spidering fitting tool and charging cable/charger, subject to order configuration. Bottom bracket inclusion has not been confirmed; verify separately. |
Frequently asked questions
We generally favour 48/32 for an 11s road drivetrain and 48/31 for 12s. Either size may work with either generation, depending on the complete installation and front derailleur.
The Spidering range covers 48/32, 48/31, 50/34, 52/36 and 53/39 in round NOQ or oval Q-Rings versions, subject to the variants offered and stock availability.
No. This is our measured weight for a complete 170 mm crankset with a round 50/34 Spidering. Other crank lengths and chainring combinations can change the weight.
2INpower measures each leg independently. INspider measures total power at the spider and can estimate left/right balance. Both claim ±1.5% accuracy.
Often, yes — but Shimano road cranksets generally use a 24 mm spindle while the Rotor uses 30 mm. Check the frame and select the correct bottom bracket.
True dual-sided data can help pace longer efforts, smaller gearing supports a comfortable cadence, the claimed 250-hour battery life reduces charging stops, and the complete system stays light.
Technical guides and alternatives
The best configuration depends on your cassette, natural cadence, front derailleur and intended riding. Explore these useful guides and complementary Rotor setups:
Select your chainring combination, round or oval profile and crank length above. Check bottom bracket compatibility before installation.
| Weight | 709g (50/34) |
|---|---|
| color | black |
| Axle | 30mm |
| Material | Aluminum 7075 |
| For Frames: | BSA, ITA, PF30, BB386EVO, BBRIGHT, BB86 |
| What's in the box : | 2inpower SL. Spidering to chooseSpacers setTool for spiderCharger for the battery |
| Drivetrain | 10,11 & 12 speeds |
| Storage location (from where it's shipped to you) | France |
| Manufacturing location | Spain |
We use a dynamic pricing grid via Packlink. Prices are adjusted in real-time based on weight, delivery address, and chosen service.
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