POLAR91047327 Speed and Cadence Sensor Bluetooth Smart Set

I Ride a terretrike sportster, the crank and back wheels are separated by geometry (tadpole geometry.) I taped (monkey grip duck tap) a stack of super magnets (about 1/2in fia) on the back side of the pedal bolt, leaving a small clearance (I used a stack as the very strong magnets fit neatly in the hole and are nearly secure without the black tape) the rear needed only minor modifications. Both linked to my iPhone simultaneously in addition to a bluetooth polar heart monitor, running Cyclemeter and work like a champ. I rolled my back wheel in the parks ng lot ten revolutions ( lazy) for 66.6 feet, verifying with a hundred foot tape measure. A decided improvement in distance measuriment, as gps distance does not seem to correct for altitude changes. Additionally they all works indoors on my training rollers. An industrious person could make an adaptor swing aluminum cylinders and a zip strip with super magnets and JB weld, for the front attachment.

I have not used these sensors yet but have verified they are operational and have reviewed the installation directives. This is what I expected based on using the previous model of sensor.

The instructions are easy to follow. Having an issue with speed sensor as have to put the sensor really really close to the wheel for me to get it to read, not problem at all with the cadence sensor.Only real negative is that once battery dies, have to re-buy, can not just change out battery.

Both work great with my Polar Vantage M. Only problem with buying on Amazon through a third party is that there is no manufacture warranty on the product. If you buy on Amazon, make sure it is Sold by Amazon not an Amazon third party vendor. The item I got from the Vendor was dead and I sent it for repair and got charged a repair fee. Luckily Polar is an awesome manufacture and covered the cost of the repair.

In a strange move, these don't work with Polar Beat app!The readings seem ok, but the strip to protect the magnet of the cadence sensor isn't the best for its purpose.I'm disappointed.

Devices work exactly and described and can be easily paired.

UPDATED REVIEW:I got fed up with these sensors when I purchased a new bike. They are a pain to install. They work well, but the installation is absurd.As I said in my initial review -These work well, pair well, but you need patience to put them on.The data is good, the pairing is good, but compared to the easy of the Wahoo Blue SC sensor these stink and are more expensive.The Wahoo works great with the Polar V800 (which is an amazing GPS enable training device).Don't buy these, buy the Wahoo Fitness SC Cycling Speed & Cadence Sensor on Amazon. I had to purchase my at another online store because Amazon was out of inventory.

I've used these sensors for 2 years and they have worked well. Still going strong on original batteries. I pair these sensors with my Polar V650.We have other bikes with the Wahoo Blue SC sensor and the Wahoo has connection issues and the batteries need constant replacement. The Polar is also more flexible in mounting, with two sensors. Finally, the Polar sensors stay in place much better than the Wahoo Blue SC, which can get knocked out of position easily.