4iiiiUltegra R8100 Precision 3+ Single Leg Power Meter(Return to Product Page)

The crank installation was easy with only one special tool required. You can find lots of videos on line about replacing a crank and it was a simple process. Once the crank was on, I zeroed it out and went for a ride. I love the fact that it also replaced my cadence sensor so now my bike has a much cleaner look since you can't even tell that there is a power meter on the crank. A huge upside to this purchase is that it also connects to apple find my devices so it takes the place of adding an apple tag with the added advantage that this crank will not alert somebody that there is an apple tag. Lots of videos on how to modify a tag to add to your bike, but this product has it already done for you! It connected easily to my Garmin and gives a great read out of my power. The battery is a bit weird to change now that they added a child protective feature, but you can watch their video on how to remove it. You have to go through a pairing process that requires removing and re-installing the battery several times.

Low cost option for power. Easy to install. It took maybe 30 minutes to put it on, connect to the app and to the Garmin head unit. Calibration is easy in both the app and head unit. Software updates quick with no issues. It seems like it might lag a touch here and there being a single side comparing it to my spider based units, but overall it works great.

Power meter works as designed. It allowed me to train using a garmin designed training. Easy to pair with Garmin watch and computer, and also with the 4iiii app. I can zero it if required but it has worked as designed. If I was not interested in training using power to improve my performance I would not bought it, however it provides all the necessary power training metrics that I need to improve my cycling performance, at a great and reasonable price.

I love this for monitoring efforts on long rides.

Great product, shipping and service.

Good accuracy, tremendous battery life and the piece of mind with Apple Find My. Assuming the battery life is as good as advertised it should last me about 2 years. I did end up putting in an Energizer lithium since the Panasonic battery that comes with it doesn�t seem to put out enough power, the connection to my Garmin kept getting dropped but has been fine since.

I've only ridden 230 miles in 7 rides since installing this power meter, but so far it has functioned flawlessly. I am very pleased with it so far.