Get an amazing deal on this Fischer - AG bottom bracket torque sensor. It can sense the force on the left crank pedal, similar to THUN/NCTE. It requires drilling a hole in the bottom bracket for cable exit. Features a 127mm square taper spindle and a 68mm BB width.

Using this bottom bracket is easy. First, you'll need to drill a small hole in the bottom bracket for the cable exit. Then, install it just like you would a regular bottom bracket, making sure to align it properly. When you're riding, the sensor will detect the force on the left crank pedal. As for maintenance, keep it clean and dry. Regularly check the cable connections to make sure they're secure. If you notice any issues with the torque sensing, it might be a good idea to have it checked by a professional. Also, be careful when drilling the hole as improper drilling could damage the product.