2025 Sram Quarq DFour DUB Power Meter

Power every ride with the Quarq DFour DUB. Designed for Dura-Ace R9100 chainrings, DFour DUB delivers on reliability & accuracy.

Reach new goals and explore new roads with a power meter that delivers on accuracy, durability, and reliability. The DFour DUB was designed specifically for Dura-Ace R9100 chainrings. Train using a Quarq power meter without changing your drivetrain. You are working hard, pushing yourself to new heights in some of the toughest conditions. Ride with confidence knowing that your power meter will not quit when you need it the most. Enjoy up to 200 hours of ride time in any weather condition with its IPX7 waterproof rating and 10k temperature compensation; if harsh climates do not hold you back, then you need a product capable of rising to the occasion. That is exactly what the DFour DUB power meter is made for. Train harder, ride faster and unlock your ultimate potential. The DFour DUB power meter brings simplicity and ease-of-use to your training. With MagicZero automatic calibration, there is no need to worry about calibrating before you ride; just jump on your bike and go. DFour DUB features Bluetooth low energy and ANT+ wireless data transfer, delivering power output information directly to your cycling computer.

Features

• Compatible Crankset - Must use Quarq DZero DUB crankset and SRAM DUB bottom bracket
• Battery: CR2032, 200 hours ride time
• Durability - IPX7 waterproof rating
• OmniCal: swap chainrings without affecting accuracy
• MagicZero - automatic calibration during the ride
• Accurate - within +/- 1.5% measuring both legs
• Wireless - BLE and ANT+
• 10K TempComp - compensates for temperature changes during a ride
• Firmware - use SRAM AXS mobile app
• Compatible Chainrings - Compatible with Dura-Ace R9100 chainrings. Works with Ultegra R8000 and 105 R7000 chainrings but will not aesthetically match

Technical Features

DUB

The relationship between bottom bracket spindle and bearing is the core of DUB technology. It's where stiffness meets durability. We took it a step beyond conventional thinking and made everything simpler-better integrating the relationship between chainring, crank, spindle and bottom bracket. It's this approach to developing a complete system that equals better drivetrain performance.

DZero

Quarq's next-generation DZero power meter platform is named for the D0 Experiment, one of science's most accurate and innovative projects to detect subatomic particles moving at the speed of light.

X-Range

Road bikes are faster and more capable than ever before, and riders are expanding what's possible with drop bar bikes. X-Range is gearing for today's road riding. We completely reimagined road gearing for wider range, more useful and smoother gear progression, as well as smarter shift settings-enabled by AXS. With X-Range, you're always in the right gear.

Exogram

Our Hollow Carbon Construction starts in the crank arm and extends into the crank's spider, maximizing the stiffness to weight ratio.

X-SYNC

SRAM X-SYNC 1x chainrings provide the highest level of performance and durability. The SRAM X-SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrain. Accept no imitation.

AXS

AXS is SRAM's new bike component integration system that connects electronic bicycle components and software. The SRAM AXS app allows riders to see battery status, change component behavior, personalize controls, get maintenance reminders, and update firmware.

Click for Specifications

Click for Power Meter User Manual