Product Description Patented Harmonic Pin-Ring technology allows TQ to design a harmonic drive gear that delivers seamless and silent integration in an e-bike system. TQ HPR50 Centerlock Speed Sensor Magnet - Pack of 3 at Trek Bicycle Browse all Trek Bicycle deals $54.99 In Stock at Trek Bicycle Price verified 2d ago Buy Now at Trek Bicycle Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Tq Tq