HP Velotechnik Hard Inner coil ring designed for bikes equipped with the HP Velotechnik Spinner Grind 2. These springs will allow you to dial in your bike's suspension to best suit your weight and load capacity, and will do so by allowing you to tighten/soften your suspension setup. This is a coil specifically designed for HP Velotechnic recumbent bikes, and will sit inside the HPV Spinner Grind 2.
