Power Meter Buying Guide – Review of the Best Models

Cycling power meters can help cyclists take their conditioning and speed to the next level.  They might be a bit above the list of “needs” for a beginner, but many intermediate and advanced cyclists and triathletes can benefit from a powermeter.

Most cyclists and bikers are gear junkies, but power meters add another level of sophistication to bike gear.  They can be a bit difficult to get your head around, but we will try to simplify it in our guide below.

First, we are going to get right to the point and share with you our favorite power meter models and setups for different situations.  We are listing our favorite 4, from least expensive to most.

Best Bike Powermeters of 2018

Best Entry Level Powermeter:  Garmin Vector 3S

garmin powermeter

Garmin Vector pedal-based power meter

Here. We hesitate to call any powermeter entry-level, because they are a major investment and intended for intermediate-and-higher cyclists.  We describe how various power meters work below, but if you want the simplest possible design this is it.  Garmin made a pedal-based power meter that measures our watt output based purely on the force exerted on the left pedal.  Yeah – that is pretty incredible.  While you might miss just a bit of the accuracy of a full-on power-measuring system, this is a pretty solid start and by no means an approximation.  It is a high-tech product and our experience is that the readouts are going to be accurate.

Note that Garmin suggests this power measurement is accurate for riders up to 240 lbs.  Above that, we are not exactly sure what happens, but they suggest it might not work as well.

The unit uses a battery, that is good for up to 120 hours per the manufacturer.  As for getting your readout of power, the most common method is probably going to be to add the Garmin software to your phone and logging it that way.  For those who want an easy way to monitor power while on a ride, you may want to mount the head-unit on your bike.

For $600, we think this is an excellent way to get into power measurement.  Of the choices you have, this is going to be by far the easiest and simplest to install.  It is as easy as putting a new pedal on.  Find here for $600.

Runner-Up Entry Level Power Meter:  Stages Crank Arm-Based Powermeters

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Stages crank-arm meters.

Also at the simple entry level, but in a different concept, is the stages line of power meters.  We love these.  Like the Garmin, they rely on making just a slight adjustment on one side of your power system.  Unlike the Garmin, the Stages model does it through a modified crank.

The crank that you put on your bike is a carbon fiber, high-end crank that has a weight and material on par with the good Shimano and Campy products that come stock on your bike.  They make models for mountain and road bikes – we are obviously focused more on road bikes (and triathlon bikes) in this review.

The battery life is going to be significantly longer than the pedal model, at 200 hours or more.  You can measure up to 2500 watts, which is more than enough for any cyclist on earth.

The only things holding us back from making this our top choice are that in order to have a mounted readout you need to buy one of Stages’ digital head unit (for about $300) and that it is a little more complicated to install a new crank vs. simply installing a new pedal.  Still, we would have no problem at all recommending this product or using it on our own bike.  Find here for around $600.

Best if You are in the Market for New Wheels:  Power Meter Carbon Wheel with Built-In Powertap Hub

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Powertap’s G3 AMP wheels build the power meter into the rear hub.

Here. If you are in the market for a new bike wheel, the right option might be to forego the add-on components all together and just get new wheels.  The wheels from Powertap are made by makers like Shimano, and built with the lightweight quality that you would get in most other wheels you might use.

The difference with Powertaps wheels is – you guessed it – they have a real hub-based power meter built in.  That means that the wheel will measure your power output with no additional parts needed.  This can be a great option if you were considering upgrading wheels, because the cost of the Powertap wheels with the built-in meter hub is not that much more than getting a power meter itself, when you balance everything out.

Granted, this option is not as good for people who switch out their wheels often.  We know people who have one set for training, one for racing, and still another for the indoor bike trainer.  It is much more of a pain to put near tires on your rim than it is to just swap out rims with the tires already on it.

Performance of the wheels is good, and measurement is highly consistent from the meter.  The model we recommend is the G3, a nice, lightweight wheel that will run you just under $2,000 if you are looking for a full set, or about $1,200 if you only want the rear wheel.

Powertap has been at this for a while, so they know what they are doing.  While they originally cut their teeth with the new rear hubs – an add-on part which they still sell – we think that the pedal-or-crank based products above are easier to install.  However, if you want to go with an entire wheel, then using a product like the G3 really is a breeze.

Best if you Want to be Top-of-the-Line:  SRM Powermeter

If you want to step all the way up to an integrated crank / crankset meter, the SRM is really the gold standard in the market and has been for a while — they started making power meters in 1986!.  There was a day when the reason you would buy an SRM was because you wanted a meter that you knew would be entirely accurate.  Nowadays, with the accuracy of pedal and especially crank-based power meters, that is no longer the case.

bike powermeter srm

SRM’s power meters are time-tested and great options for advanced cyclists.

Today, we find many people who feel the need for an SRM feel that the pedal-or-crank-based system would not be compatible with their components, so they decide to update the entire crankset.  Still, we like that there is no doubting the accuracy – this is really about as dialed-in as you can get on your power.  It has been truly time-tested, and if you look at what many of the pros are using, they are going with the full chainring-based SRM product.

These power meters are not cheap.  They typically run over $2,000… but there is a ton of engineering that goes into them.  If you are already riding a $5,000 bike, another couple thousand to dial your training in just right might not seem like that much.

We like that SRM offers a step-up version made by Campagnalo – providing for comparable quality to the stock gear on even the highest-end bikes.  The drill is that you choose the chainring you want (which has the power meter built in) and then size it accordingly to the intended chainring for your particular bike.  They make models for both road/tri bikes as well as mountain bikes.

As for electronics, you can pair the SRM Power Meter with pretty much any newer-generation workout tracking device, including the latest products from Garmin.  If you want to mount an easy-to-read readout on your bike, SRM offers several of their “Powercontrol” displays, but then run over $300 and SRM is clear that you do not have to use them.

Types of Bike Power Meters

When you first look at the market for power meters, it is easiest for your head to spin even if you are an experienced cyclist or triathletes.  Which parts do I need?  Do you use a crank with a pedal?  What about the hub?  How do I actually see my power?  So many questions, and we can’t blame you.

Unlike most bike products where you just compare the same part, powermeters are a different animal.  When you are looking for a saddle, you choose between Saddle A, Saddle B, and Saddle C.  Pretty simple.

In the world of power meters, it is much more of an “either, or, or” formula.  Here are the basic power meter types you will see on the market:

  • Chainring-and-Crankset. This is the original form of Power meter, and the one featured by SRM that we recommend above.  Using this type of power meter means that you replace whatever you are using as your chainring and crankset (including cranks) with this product, which will then measure your power.  These tend to be highly-accurate, and are a permanent fixture on your bike so will measure the same regardless of your wheels or pedals.  They obviously require an involved installation.
  • Hub-based. This type of powermeter means that the power will be measured through the hub of your rear wheel.  You can buy a hub all by itself, or as part of a broader wheelset for your bike.  They are made to be compatible with most of the popular wheels on the market.  The pros are that they tend to stay quite true from ride to ride.  The con is that they are difficult to swap from bike-to-bike once installed.
  • Crank Arm-based. A crank-based power meter is a simple addition to your bike.  All you do is put a new crank arm (the shaft between the chainring/crankset and the pedal) on one side of your bike, and it will measure the power.    Simple, easy, and works regardless of the wheel or other parts on your bike.  These are typically less expensive than a chainring/crankset system.
  • Pedal-based. The pedal-based systems made by most major manufacturers today, and like the Garmin recommend above, are perhaps the easiest to install and use.  It is truly as simple as adding a new pedal to your bike.  Many of us swap out pedals on occasion anyway, and it only takes a minute or two.  These, along with the crank arm-based systems above, have played a big part in dropping the price of power meters and moving them from being an advanced cyclist product to one that can be used by intermediates as well.

Power Meter Displays, Readouts, Statistics

srm control

Example of SRM’s proprietary power control display

Getting the power meter installed on your bike – be it any of the types listed above, is only part of the equation.  The next part is having a way to receive and read the data.  There are a few ways to do that, and more and more they are Bluetooth-enabled.  This is the huge advantage of buying a new powermeter vs. a used one.  The older models required wires that are now all but obsolete.

There are a few ways to get your data once you install a power meter:

  • Buy a compatible monitor for your bike. There was a day when the only way to read your power statistics was to buy the monitor from however made your power meter.  This often ran another $200+.  That is still an option, and we like that these monitors are built-for-purpose and provide a nice, big clear readout.  It is safer to glance at a big number while you are riding than try to find the stats on your smaller watch.
  • Use a compatible device, already on your bike. As long as the device on your bike (if you have one) is relatively new and bluetooth enabled, there is a very good chance you will be able to sync the powermeter to the same device you use to track your speed, mileage, and time.
  • Use your watch. If you are like many triathletes, you use an all-purpose triathlon watch suitable for running, cycling, and maybe even swimming.  If the watch is new enough – like the many of the Garmin Forerunner models – you can download your power stats to the watch, and log the workout with your other garmin data.

Other Things to Consider in Your Power Meter

We’ve covered a lot of ground, but there are a few other things to keep in mind with your power meter.  Some of these are summarizing key points we’ve already made, but they bear repeating.

  • Ease of installation. Be sure that the power meter you choose is one that you can install yourself and work with, or if you need it professional installed (like a hub or chainring-based system) have it installed professionally so your bike is safe to ride.
  • Battery life. Power meters today, with their Bluetooth technology, require some battery life.  Most of these batteries will last you for an entire season or longer, but some will not.  Be sure that the battery life meets your needs, and that replacing a battery is not terribly complicated.
  • For most bikes, today’s power meters have thought of everything including how to co-exist with your already high-end bike.  However, it is worth doing a little research to be sure that the device is a good fit for your bike and its components.
  • Finally, if you are only planning to use a power meter indoors why cycling on a trainer, consider opting for a smart bike trainer setup instead.  They all have some form of power meter built-in, most with an accuracy rate within 1-2% of actual power.  A great way to manage your workouts while indoors.

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