The Best Power Meters for Gravel Bikes

Gravel is the one discipline where the pedal is the hard part of the power meter decision. Most gravel riders run SPD two-bolt cleats — for walkable shoes, for mud clearance, for getting in and out quickly on a loose surface — and until Favero built the Pro MX, almost every pedal-based power meter was a road cleat. That is the gap this product fills and the reason it tops the page.

The engineering case is that Favero put its existing ±1% IAV sensor into a proper off-road body: 199 g per pedal with the sensor, an 11.2 mm stack height, a 54 mm Q-factor and a hardened 6061-T6 aluminium platform. Those stack and Q-factor figures are unusually low and narrow for an SPD pedal, which matters because a power meter that changes your fit has cost you something to gain a number. The real trade is battery: Favero quotes at least 60 hours per charge for the MX-2, the shortest in its range. Our Assioma Pro MX review covers both versions in full.

The MX-1 and MX-2 are the same product with a different number of sensors. Body, cleat interface, 199 g weight, 11.2 mm stack, 54 mm Q-factor, the app and the ±1% claim are identical; the MX-1 measures the left leg and doubles it. For a rider who wants power on a gravel bike primarily to pace long days and to train to an FTP figure, that is a perfectly honest instrument, and it costs meaningfully less.

It also has the best upgrade path in the category: Favero sells the second sensor pedal separately, so an MX-1 becomes an MX-2 later without replacing anything you already own. If you are unsure whether balance data will matter to you, start here. Single vs dual-sided power meters is the full version of that decision.

SRAM's AXS groupsets are everywhere on gravel bikes, and the Rival power meter crankset is the cheap way to add power to one. It is a complete crankset with the measurement in the spindle, so there is no crank-arm part number to match and nothing bonded to the outside of an arm. For a gravel rider, the position of the electronics is a genuine advantage: the bottom bracket area sees mud and water but not the direct rock strikes a pedal takes.

Be clear about the accuracy claim. SRAM specifies ±1.5% for the measurement it takes and ±3% for the total, because the total is one leg doubled. That is a wider tolerance than anything else here, and it is the honest number to plan around. Fitment is the other constraint: SRAM DUB, 12-speed, and nothing else. Our Quarq power meter reviewcovers SRAM's range, and best crank power meters puts it against the alternatives.

Plenty of gravel riders have already settled their pedal: a specific SPD body for mud clearance, or a flat-and-clip hybrid, or something chosen to match a pair of shoes they walk in. For those riders a pedal-based meter is the wrong shape of product, and a bonded crank-arm unit is the right one. The Precision 3+ is a strain gauge bonded to the inside of a non-drive-side arm, adds 9 g, measures 0 to 4,000 W, and runs for up to 800 claimed hours on a coin cell.

The compatibility exercise is the whole job: you order the arm that matches your crankset model and your crank length, which on a gravel bike may be a GRX, a SRAM or a third-party crank. Get that right and installation is around ten minutes with a hex key and a torque wrench. 4iiii claims ±1% for the torque it measures — the left-arm figure, not your total, which is that number doubled. Our 4iiii Precision review goes through what that means in practice.

Two features here are unusually well matched to gravel riding. OmniCal lets you swap chainrings without recalibrating the meter, which matters on a 1x bike where the ring is a gearing decision you may revisit for a hillier event. MagicZero recalibrates automatically, which removes the one maintenance habit riders forget when they start a ride from a car park in the cold.

It measures total power at the spider and claims ±1.5%, reporting an estimated balance rather than a measured one. The limits are fitment and portability: it is a SRAM AXS part, it has to match your crank, and it stays on that bike. If your gravel bike is also your winter trainer bike, that is fine; if they are two different bikes, a pedal meter is the better architecture.