DFour Power Meter Alloy Crank Arms
Gym routines and hours on the trainer aside, truly improving on the bike can be hard to quantify when you don't have the data. Power Meters provide us with sound, tangible numbers that show us where we're excelling, and where we have room to push harder — the only problem is the often wallet-draining price tag that goes along with them. Quarq aims to mitigate this issue with its DFour Power Meter Alloy Crank Arms, which drop the pricey carbon alternative for trusty aluminum, simultaneously knocking the price down a few pegs to be a bit more pocket friendly. Despite its alloy shell, the internals work the same as its sibling. The DFour is, essentially, the DZero model but with one fewer chainring bolts and a bolt circle diameter (BCD) that fits Shimano's latest generation of 11-speed road chainrings, specifically Dura-Ace 9000, Ultegra 6800, and 105 5800. That means that, with the exception of the latest Dura-Ace 9100, the DFour is compatible with every 11-speed road drivetrain Shimano has engineered to date, so fans of the Japanese company aren't relegated to choosing between more expensive or less accurate power meter options.
Except for that compatibility difference, the DFour incorporates every piece of technology Quarq crams into the DZero. Chief among these is the power meter itself, which saw a healthy amount of retooling. Overall, Quarq claims that "150 documented improvements" inform the evolution from the previous models to DFour, but the most important is to the heart of the meter itself: the strain gauges and measurement circuitry. It still incorporates five strain gauges strategically placed throughout the spider in order to measure the Newton meters you're throwing into the pedals. It's also still got the same claimed accuracy of +/- 1.5%, so its numbers are 0.5% more accurate than most meters, but the new design requires less correction in order to maintain accuracy in drastic temperature changes. Fewer corrections mean the DFour also better rations battery life than Quarq's previous power meter models, though when the battery does go out, you can still change it without tools or having to ship the whole thing to the manufacturer.
As with the DZero model it's based on, the DFour system's accuracy is further boosted by the return of Quarq's 10k dynamic temperature compensation technology, which alleviates the need for constant, mid-race zeroings in variable conditions. Even if it's just coasting for a few seconds or toggling through your head unit to the proper option, it can still be the difference between winning and losing. It's also obnoxious as hell. The DFour is equipped with an auto-adjust schedule based on a constellation of around 10,000 data points that chart how the unit responds to temperatures ranging from zero to 130 degrees Fahrenheit. This lets the power meter figure out the atmospheric details for you with minimal drift, so you can focus on turning the crank, not babysitting it.
Power Balance and Omnical are two additional returning features that record total output and output for either leg individually (Power Balance) and let you swap rings without recalibrating or negatively impacting accuracy (Omnical). As with previous Quarq models, the DFour communicates to your head unit via ANT+ wireless, but Quarq also adds Bluetooth to this generation. Up till now, we've always tempered the obligatory head unit-compatibility statement by writing that your current computer is likely already compatible with the power meter; now, we can just state outright that it is compatible.
We recognize that there is value in cycling components that can stand up to the elements we often encounter throughout the course of a year of training, but Quarq demonstrates its penchant for being overly thorough by ensuring that the unit's internals can handle comically extreme conditions. The system is waterproof for 30 minutes while submerged under one meter of water, a feature that will come in handy on days you take your bike on the swim leg, too.
Since the DFour is effectively a catch-all for almost every bit of tech Quarq has thrown at the power meter problem over the past decade, it includes the AxCad accelerometer, which provides cadence information without any additional sensors or magnets. The DFour is also compatible with training software suites including Training Peaks WKO+, Training Peaks, Golden Cheetah, and Strava. Unlike previous versions, the DFour's Bluetooth compatibility lets it sync with the Qalvin BLE app to easily tune, tweak, and set zero offsets.
- Take your training to the next level with data at hand
- Forged aluminum arms are resilient against hard riding
- Redesigned strain gauge system is even more precise
- Provides power for each leg individually
- Broadcasts via ANT+ and Bluetooth protocols
- Requires less correction for better data and longer battery life
- Easily swaps between frames and chainrings
- Battery can be changed by home mechanics without tools