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7. How to Choose the Right Power Meter

It&#;s important to understand that selecting and buying a power meter depends on a number of personal factors (your bike, budget, etc.). There is no such thing as &#;the best power meter&#;. The right power meter for you might not be good for the next person. We never recommend a power meter to a customer until we understand their own unique set of circumstances. For riders that are new to power meters, we recommend focusing on three areas: (1) Compatibility, (2) Features and (3) Price.

Or, you can use our PMC Power Up Tool. This allows you to view power meters based on factors that are most beneficial to you. For example, you can search by price, brand, power meter type, power measurement, compatibility, ease of use and more!

1. Compatibility

Compatibility simply refers to whether the power meter will fit with your current frame or components. For example, if you&#;re looking at a crank-based power meter, is it compatible with your frame and bottom bracket? Maybe you&#;re looking at a power meter pedal. Is it compatible with your shoes and cleats?

If the power meter you are interested in isn&#;t compatible with your bike or components, it&#;s time to look at another power meter. (Unless you&#;re willing to make a change to your components in order to accommodate the power meter.) The last thing you want to do is buy a power meter only to later find out it&#;s not compatible with your bike. So be sure to confirm compatibility before purchasing. All of our product listings contain a compatibility section &#; so you can look there for notes on compatibility, or give us a call and we can help.

In general, there are more options for the road then there are for the other cycling disciplines (mountain, track, cyclocross, etc.). However, as more power meters continue to enter the market, the other disciplines are quickly catching up.

2. Features

There are several features you will probably want to consider when buying a new power meter. We have listed them below in order &#; starting with the most important. But the order below is just how we look at power meters. Again, we all have our own unique set of considerations. Maybe you have to move a power meter between bikes, in which case transferability will be higher on your list. Alright, let&#;s check them out.

Accuracy

Accuracy refers to whether the power meter is indeed measuring what it claims to be measuring. For example, if it&#;s transmitting 225 watts to your head unit, are you actually producing 225 watts, or are you producing 215 watts instead? This must be listed first as it&#;s usually one of the more immediate things people think about when buying a power meter. However, the truth is, while accuracy is of course key when using any power meter, this is not something most cyclists need to worry much about. All the direct force power meters we carry are tried and true, and are very close to one another in terms of accuracy (+/- 1.5% or better) &#; assuming it is installed and calibrated correctly.

If absolute accuracy is your goal, there are some super precise power meters that have been certified accurate all the way up to +/- 0.5%. So, if that&#;s what you&#;re looking for, more power to you (pun intended). But again, for most cyclists, other features (and of course price), usually prove more important.

Reliability

Nothing is more frustrating than a piece of faulty equipment. You want your power meter to work and be reliable, every day. Reliability is key when looking at power meters so be sure to do some research in this regard. Fortunately, most of today&#;s units rank high in terms of reliability. Again, contact us here with questions.

Transferability

Transferability refers to how easy the power meter is to transfer from one bike to the next. If you have multiple bikes but only one power meter, it&#;s nice to be able to move the power meter from bike to bike. Some power meters are easy to transfer; others not so much.

Generally, the easiest power meters to transfer are pedal-based power meters and opposing force power meters, such as the PowerPod. Next easiest are usually crank arm-based power meters. Then there are crank- or spider-based power meters &#; which can be moved among bikes &#; but typically aren&#;t due to the time it would take to do so, as well as potential frame compatibility issues between your bikes.

Installation

Installation usually goes hand-in-hand with transferability. Power meters that are easy to transfer are usually easy to install. The easiest power meters to install are pedal and crank arm power meters. Spider or crank power meters on the other hand require more work. However, assuming you&#;ve purchased a power meter that is compatible with your bike and bottom bracket, even these are relatively straightforward to install and mostly require common tools.

Contact us to discuss your requirements of 20 meters long reach arm for sale. Our experienced sales team can help you identify the options that best suit your needs.

In addition, assuming you&#;re not moving the power meter from bike to bike frequently, keep in mind that installation is a one-time thing. So even if the installation process is a bit more involved, don&#;t let this deter you too much if the power meter checks all of your other boxes.

Left/Right Measurement

Some power meters offer independent left/right power measurement. With this feature, you can measure how much power each leg is generating independently. While left/right power measurement is a very cool feature, there is some debate as to how meaningful this information is and whether you can, or even should, try to even out any imbalances you might find.

There are two types of left/right power &#; actual and estimated. Power meters such as ROTOR&#;s 2INpower SL or pedal-based power meters, measure both legs independently. They combine the data to give you total power. ROTOR does this by locating a power sensor on both crank arms. Whereas the pedals house a power sensor in each pedal.

On the other hand, spider-based power meters such as the Quarq power meter only estimate how much of your total power is coming from each leg. This is because there is only one power meter on the bike (in this case in the spider), so the power meter needs to make some assumptions. Specifically, they take power from your left and right down strokes (where most of your power is produced) in order to determine how much power each leg is producing separately. To be clear, this estimation is only in regards to your left and right power destitution. When it comes to calculating your total power (the important number!), they are very accurate and don&#;t have to make any estimates as all of your power passes through the spider.

Transmission Protocols

Your power meter will communicate with your bike computer, smartphone or tablet through one of two wireless protocols: ANT+ or Bluetooth SMART. Note that nowadays, most power meters are compatible with both.

ANT+

ANT+ is a 2.4 GHz wireless network which is used to send standard information wirelessly from one device to another. It allows your power meter to communicate with your head unit. All power meters and head units we sell are compatible with ANT+ technology.

Bluetooth SMART

Bluetooth SMART technology is also a wireless protocol, however it allows you to connect your power meter with smart phones and tablets. It also allows for pairing with popular training apps such as Zwift.

Batteries

There are two aspects you might want to consider when looking at the battery for your power meter: battery type and battery life.

Battery Type

More and more power meters are coming with rechargeable lithium-ion batteries. Rechargeable batteries offer a bit of a trade-off. On one hand, you never have to worry about replacing the batteries in your power meter. However, rechargeable battery life is typically less than that of a replaceable battery.

The most popular replaceable battery is the CR coin-cell battery. These batteries are cheap and you can find them virtually anywhere. Other batteries that are used are AA (ROTOR INpower V3) or LR44/SR44 (Garmin Rally). We always recommend keeping a few batteries on hand to eliminate the risk of being without a battery when you need one.

Battery Life

Battery life largely depends on the type of battery your power meter has. As mentioned previously, rechargeable batteries have a bit of shorter life. On average, power meters with rechargeable batteries typically get around 150 hours of battery life. However again, this is an average and some, such as the 4iiii PRECISION 3P+ get as much as 800 hours!

This compares to power meters with replaceable batteries which get closer to 250 hours on average. But again, the range is wide for this group as well as the ROTOR INpower V3 gets 300 hours while the Garmin Rally gets closer to 120 hours.

Weight

All power meters add weight, some more than others. Power meters such as a left-side only crank arm-based power meter might only add 10-20 grams to your bike, while others might add closer to 200-250 grams or more (but this all depends on the component you are replacing). When factoring in the weight, remember to focus on added weight by taking into account the component you&#;re replacing. For example, if the crank-based power meter you&#;re considering weighs 700 grams, and your current crank weighs 500 grams, the net addition is 200 grams.

While it&#;s important to pay attention to how much weight is added and where, it&#;s not worth fussing over. The benefits of training with power will more than offset any weight gain. If you&#;re a weight weenie (and we don&#;t say this is a bad way), weight might move up on your list. Otherwise, we think it&#;s safe to keep it here.

3. Price

Power meters start at around $220 and can reach $2,500 or more. Some of the more expensive power meters offer features like carbon fiber cranks, independent left/right power measurement and high levels of accuracy and consistency. However, this isn&#;t to say that a lower priced power meter can&#;t do the job. In fact, nothing could be further from the truth. The vast majority of power meters are very capable assuming you have them set up properly and calibrated &#; so don&#;t assume that more expensive is necessarily better. If you find a power meter that meets your criteria and is in your price range &#; than it&#;s likely a winner for you.

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