The choice of off-road power meters is pretty limited in comparison to those compatible with road bikes, and pedal power meters are even fewer and further between. The Garmin Rally XC200 offers all the dual-sided capabilities of the Garmin Rally pedals within a Shimano SPD pedal body. Not only does this mean you can access more data than you probably know what to do with, you don't need to buy a power meter for each bike you ride. Realistically you will only want a SPD body for off-road riding so it could work out an expensive option if you only have one gravel or mountain bike. The Rally series does allow you to swap to a road pedal body but that's not a job you'll be wanting to do every ride.
Uses reliable and popular Shimano SPD pedal body
Masses of data available
Spindle inter-changeability means you can swap into road pedal guise
More vulnerable than crank / spider based power meters
Swapping spindle not practical on a regular basis so limits swapping between road and off-road pedal bodies
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Until recent years power meters have been fairly uncommon in the off-road world. Power isn’t so important to many mountain bikers and there aren’t many options that are compatible with off-road bikes and conditions either. But changes are afoot and power meters are starting to feature more and more as technology advances and gravel riding pushes demand.
There are a number of off-road crank arm / spindle / spider options from Quarq, 4iiii, SRM, Rotor and Stages that have been around for a while but dual-sided and pedal power meters are a much rarer beast. Here we look at the Garmin Rally XC pedals and see how they stack up against the best pedals for gravel bikes and best power meters too.
We’ve actually already reviewed the current Garmin Rally pedal as a Look road pedal (Garmin Rally RK200). But as well as two different road / three-bolt shoe versions - the RS (Shimano SL) and RK (Look) – the Rally is also available as the XC for off-road / two-bolt shoes.
The Rally is comes in either single or dual-sensing models, the 100 or 200 series. As before, we have the dual version on test for all the fancy pedalling dynamics data.
Garmin Rally XC200: construction
For the Rally XC, Garmin have encased the spindle power sensor in the incredibly popular and highly reliable Shimano SPD pedal body. This gives the pedal exactly the same feel and adjustability of Shimano SPD pedals as well as the convenience of using the same cleats. Unlike the Rally road version that comes in two different pedal body options, SPD is the only off-road option so, if you’re like me and use a different pedal system, you’ll have to change your ways and conform to the masses.
Aesthetically the Rally XCs look like a fairly chunky but beautifully machined Shimano SPD pedal. Unsurprisingly they weigh a bit more (442g as tested) and have a greater stack height (13.5mm) than a non-power pedal. Exact comparisons depend on which model you’re comparing to (the current version of the popular XT pedal is 342g and 8.3mm). I think a useful way to interpret all of this is that you have a dual-sided power meter at the cost of 100g and a few mms stack which is probably acceptable to most people. From a set-up point of view you may want to easily adjust your saddle by a few millimetres to compensate. We’ll come back to the other issue with stack when we’re riding.
The Rally is powered by a non-rechargeable CR1/3N (or two LR44) battery which is accessed via a 4mm hex key. Due to cross-threading issues on previous models the cover inserts on a metal thread. Using a removable battery does risk water and dirt ingress but does have the advantage of improving battery life compared to rechargeable versions - Garmin claim 120 hours of riding for the Rally.
Garmin do include a couple of spare o-ring seals for when you might lose / tear one during a battery change and the pedal has a waterproof rating of PIX7, or “withstands incidental exposure to water of up to 1 metre for up to 30 minutes” so – as long as you tighten up the battery cover properly on the occasional change – you shouldn’t have a problem.
As the spindle is full of the good stuff there’s not room for a hex fitting, so the pedals use a 15mm pedal spanner for fitting and removal. As the spindle protrudes slightly on the inbound side of your crank there are a couple of spacers that you can add if there isn’t sufficient clearance to the chain. Adding these changes the Q-factor from 53 to 55mm.
The only other adjustment is the 12 click tension adjuster on the cage as seen on other SPDs which allows you to get the release feel to your liking.
One of the biggest advantages of power pedals over other systems is the ability to swap between bikes. In the case of the Rally XCs If you’re from a road bike background this is less of an advantage to you as it’s unlikely you’ll want to run SPD pedals on the road. But if you’re a mountain biker like me you can swap and change them from gravel to MTB which makes them a really attractive option.
Although you might not have another off-road bike you want to fit to, the Rally is designed that you can swap the power spindle into a different road body to use as a Shimano SL or Look Keo pedal. Based on our testing and advice from Garmin, this isn’t a job to do regularly so its perhaps not as attractive as it might sound if you want to regularly swap. The other downside is that the pedal bodies are pretty expensive (>$/£200), granted nothing close to the power meter itself but still an additional investment.
The Rally pedals are both ANT+ and Bluetooth enabled. Using the ANT+ I connected up to my Garmin Edge 1000 and via Bluetooth to my phone to add to Garmin Connect. Using the Connect app allows you to access firmware updates so it’s worth connecting once in a while otherwise everything can be done from your head unit (Garmin or otherwise).
Connection between the pedals and head unit was really straightforward via the ‘add sensor’ function. One thing to pay attention to is adding your crank length rather than allowing it to default to the 172.5mm setting and so likely miscalculate your power.
I did a lot of swapping and changing between bikes for testing so calibrated each ride, although you could choose to use the ‘prompt’ option on your unit to avoid calibrating every time. Calibration is faster after you’ve spun the pedals for a couple of minutes so it’s worth being a little patient to start with.
The underwhelming headline is the Garmin Rally felt exactly like a Shimano SPD pedal. It took me a few rides to get the pedal tension and cleat position sorted but clipping in and out was easy and reliable.
A big risk with power pedals on an off-road bike is their vulnerability to striking on rocks. The risk is increased with the greater stack height making the pedal lower to the ground than a thinner one. In truth on a gravel bike this isn’t really much of an issue, bottom brackets aren’t that low and you’re unlikely to be riding the kind of terrain that sees rocks and roots jutting out at all angles. It is more of an issue risk if you want to use on a mountain bike and I’ve clobbered a pedal a few times doing this but they’ve come to no harm. I have friends who have run these pedals for much longer and suffered many more rock strikes who report the same. I suspect this is the reason that they’re only recommended for cross-country mountain biking and not higher risk trail and downhill riding.
On the waterproofing front, I’ve done some very wet winter testing I’ve not had any moisture leaking past the seal and I’m certainly reassured by the waterproof rating.
The two-sided pedals give you an absolute wealth of data on your head unit and to pore over afterwards. As well as the obvious outputs and hitting your target cycling training zones, understanding how your left / right balance and pedalling dynamics change in line with the terrain gives you plenty to get your teeth stuck into to challenge your off-road riding.
Garmin claim an accuracy of +/- 1 per cent. Comparing to data from a Wahoo Kickr V6, values varied by no more than one watt across the whole power curve. The only exception to this was readings below 10 seconds where the Rally pedals read higher albeit within a 1 per cent margin (the Kickr also has a claimed accuracy of +/- 1 per cent so a variance of 2 per cent would show a good correlation of the data). Looking at the data and understanding the mechanics of the different power readings suggests that it’s the lag of the flywheel and smoothing of Wahoo’s data that results in the Kickr showing a lower power than an over-estimation from the Rally pedals.
Accuracy aside, the data from the pedals is really astounding and is a great demonstration of what a power meter can do. I’m already spending too much time geeking out at how my left/right balance changes at different cycling cadences, power and terrain. Whether all this data will improve my riding is another matter…
Value and conclusion
At $1,200 / £1,000 (currently £800, no US reduction) the Garmin Rally XC200 pedals are not going to be a purchase for the faint hearted. The only direct competitor is the SRM X-Power off-road pedal which retails at around $1,350 / £1,100 which makes Garmin’s offering seem good value. The one-sided version of the Rally will cost you $700 / £600 (currently reduced to £500, no US reduction) and the road pedal body $250 / £220 if you want to swap across bikes.
The Garmin Rally XC200 is a hugely capable dual-sided pedal in the accessible form of a Shimano SPD body for off-road riding. Although expensive, pedal power meters can be a good investment as you can swap between bikes but only if you want to run the same pedal type on each bike. The transferable Rally spindle does open up the option of even more swapping between off-road and road bikes but it’s not a day to day option.
If you want to find out how to make best use of your power meter, check out our guide on how to use and train with a power meter.
- Battery type: LR44/SR44 (x4)
- Battery life: Up to 120 hours (with LR44 battery type)
- Weight: 448 g
- Water resistance (opens in new tab): IPX7
- Max. rider weight: 105 kg
- Accuracy: +/- 1.0%
- Cleat type: SHIMANO SPD
- Q-factor: 53 mm/55 mm with supplied spacing washer
- Stack height: 13.5 mm
- Measurement location: Spindle
- Communication: ANT+ and Bluetooth
- Other features: Field calibration, Adjustable release tension, Garmin Connect
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Rachel has been writing about and reviewing bike tech for the last 10 years. Cynical by nature, Rachel never really trusts the marketing hype and prefers to give products a mighty good testing before deciding whether they're worth buying or not.
Rachel's first riding love is mountain biking where she's been European and UK 24hr Champion on more than one occasion. She's not just confined to the trails though and regularly rides - and occasionally races - on gravel and road too.
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