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Quarq DFOUR91 Power Meter

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From £726.40 £171.40 discount
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  • Free tracked delivery
  • Trustpilot review 9.2 out of 48.620 reviews

Pros & Cons

  • This power meter is very precise.
  • This power meter measures double-sided and therefore gives a good reflection of the delivered power.
  • With the Shimano chainrings, this power meter fits well with the rest of your group set.
  • The price-quality ratio of this power meter is very good.
  • This power meter is not suitable for Ultegra 6800 and Dura Ace 9000 chainrings.
  • You need a new, GXP bottom bracket for this power meter. It does not fit in a Shimano bottom bracket.
Read more on what our customers have to say about this product


Brand Quarq
Number of gears 11 speed
Compatible withShimano
Measuring PositionSpider
Measurement Dual-sided
Power SourceBattery
Type of axle GXP
All specifications


The Quarq DFOUR91 power meter is a power meter that is interchangeable with Shimano Dura Ace R9100 chainrings. The Quarq DFOUR91 is an excellent addition to your Shimano groupset. The Quarq DFOUR91 power meter is also suitable for Shimano Ultegra R8000 chainrings. This power meter is equipped with a 24mm GXP bottom bracket fit. A bottom bracket with a GXP fit is required for this.

Quarq's power meters come from Sram and are equipped with ANT+ and Bluetooth. These Quarq power meters are one of the most accurate power meters on the market. With a maximum deviation of 1.5%, you have a very accurate power meter that measures both legs. The measuring system is built into the spider of the crankset. This gives you good protection and a battery with a somewhat longer life than, for example, Stages.

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Frequently bought together

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11 reviews
Number of gears 11 speed 11 speed
Compatible with Shimano Shimano Shimano
Application Road Road Road Road
Measuring Position Spider Crank Crank Spider
Measurement Dual-sided Dual-sided Dual-sided Dual-sided
Power Source Battery Rechargeable battery Battery Battery
From £726.40 From £826.70 From £827.60 From £642.80
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Customer photos


9.4 / 10 Average from 5 reviews | Write a review

9.4 / 10

5 reviews


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Most recent reviews

9 / 10

Umberto, 4 February 2019

ottimo prodotto!!

Spedizione velocissima e prezzo competititvo!!

10 / 10

POUILLET, 28 January 2019



  • livraison
  • service
  • prix

10 / 10

David, 23 January 2019


Envío rapidísimo, el potenciometro va al milímetro , una gran compra y en una buena compañía , al mejor precio


  • Peso
  • Diseño
  • Elegancia
  • Funciobabilidad
  • Fácil montaje


  • Ninguno

9 / 10

Robert, 21 December 2018

Zeer geslaagd!

Na wat onderzoek tussen de verschillen in powermeters ben ik uit gekomen bij de Quarq DFOUR91 vanwege de compatibiliteit met de kettingbladen van Shimano en het strakke uiterlijk. Na aankomst van het product was ik zeer verrast over de uitstraling en hoe solide het product voelt. Na installatie van de powermeter op de fiets was het een kwestie van seconden voor het koppelen met de telefoon en mijn Garmin. Super snel, super simpel. (Let er bij de installatie van de powermeter op dat je de crank aan de non-drive zijde op het juiste moment aan draait (50-55 Nm). Anders kan de crank los komen.) Ik heb deze powermeter gecombineerd met kettingbladen van Dura Ace (R9100) omdat deze beter aansluiten op de vorm van de powermeter en zo een nog mooier geheel geeft. De kettingbladen van Ultegra (R8000) passen wel zonder problemen, maar sluiten minder mooi aan omdat de vorm van het kettingblad ter plaatse van de aansluiting met de powermeter net anders is. Ik ben dus erg tevreden en samen met de Dura Ace kettingbladen een zeer mooie powermeter voor een erg mooie prijs!


  • Mooi uiterlijk
  • Met Dura Ace kettingbladen is het echt af
  • Kettingbladboutjes worden mee geleverd
  • Snelle installatie


  • Met Ultegra kettingbladen net niet helemaal af

9 / 10

FRANCESCO, 30 November 2018

Ottimo prodotto ad un buon prezzo


  • Bello
  • Preciso
  • Funzionale

All specifications

Number of gears 11 speed
Compatible withShimano
Measuring PositionSpider
Measurement Dual-sided
Power SourceBattery
Type of axle GXP
CompatibilityANT+ / Bluetooth

Manufacturer specifications

• Built-in temperature compensation
• AxCad - Cadence meter where no cadence magnet is required
• Bluetooth and ANT+ wireless data transfer
• Battery - CR2032, 200-hour battery life, replaceable without a tool
• OmniCal - change your chainrings without affecting accuracy
• Divergence - within 1.5%, in which both legs are measured
• Free firmware updates with the Qalvin app
• IPX7 waterproofing
• Power Balance
• 2-year warranty

Customer Service
020 3695 9922