One of the best power meters just got better: say hello to the Favero Assioma Duo-Shi, a Shimano-specific power meter solution
(Image credit: Aaron Borrill)
When it comes to the best power meters, Favero's Assioma Uno and Duo pedals are considered one of the most accurate options in the segment. We tested the standard Favero Assioma Duo power pedals back in April last year and awarded them five stars for their lightweight appeal, competitive pricing and accuracy. In fact, the only bugbear centered around the dearth of a Shimano-specific option - something which has limited their appeal to a certain extent. In an about-turn, the Italian company has today launched the new Assioma Duo-Shi: a cartridge that screws into your existing Shimano SPD-SL pedal system.
Installation is easy requiring you to merely unscrew the stock pedal spindle and replace it with the Assioma Duo-Shi cartridge. The Duo-Shi cartridges are compatible with the Shimano PD-R8000, PD-R7000, PD-6800, PD-R550 and PD-R540 pedal bodies - a brilliant move given current COVID-19-related cycling stock shortages.
Image 1 of 3
The Favero Assioma Shi uses Bluetooth and ANT+ compatibility(Image credit: Aaron Borrill)
It's the same tried and tested sensor as the existing Favero Assioma power meter pedals(Image credit: Aaron Borrill)
The only difference is compatibility with Shimano's SPD-SL pedal bodies(Image credit: Aaron Borrill)
Best power meters: Consistent power data for both indoor and real-world cycling
Despite sharing much of its design blueprint with the standard Favero Assioma Duo pedals, the cartridges are not cross-compatible. In fact, there are some notable disparities between the two models including the software (the Assioma Duo-Shi sensor has undergone a different factory calibration), the spindle/cartridge length and Q-factor. Speaking of which, the Q-factor (the distance between the outside of one crank arm to the outside of the opposite crank arm) has increased by 11mm and there's an added oil retainer glued to the axle.
In terms of weight, the Assioma Duo-Shi cartridges tip the scales at 99g each. The total system weight is 156g (actual) once screwed into the Shimano Ultegra PD-R8000 pedal body.
Pricing is pegged at €495 (plus VAT), which is €75 less than the standard Favero Assioma Duo pedal system.
View the Assioma Duo-Shi power meter pedals at Favero
The Favero Assioma Shi cartridge (bottom) is sold alone and designed to fit to your existing Shimano pedal body (top) (Image credit: Aaron Borrill)
Tech Specs: Favero Assioma Duo-Shi power meter pedals
RRP: €495
Weight: 312g (actual, 156g per pedal)
Measurement: Dual-sided power measurement
Chainring compatibility: Round and oval
Battery type: Rechargeable lithium-ion
Battery life: 50+ hours
Accuracy: +/- 1 per cent
Cleat system: Shimano SPD-SL
Get The Leadout Newsletter
The latest race content, interviews, features, reviews and expert buying guides, direct to your inbox!
Josh hails from the Pacific Northwest of the United States but would prefer riding through the desert than the rain. He will happily talk for hours about the minutiae of cycling tech but also has an understanding that most people just want things to work. He is a road cyclist at heart and doesn't care much if those roads are paved, dirt, or digital. Although he rarely races, if you ask him to ride from sunrise to sunset the answer will be yes.
Height: 5'9"
Weight: 140 lb.
Rides: Salsa Warbird, Cannondale CAAD9, Enve Melee, Look 795 Blade RS, Priority Continuum Onyx
