The P-line is a premium product with premium features, including a 5-year warranty when registered online. With the C-line, we have created a light and compact gearbox with lower manufacturing costs which is perfectly suited to upper mid-range bicycles. There is a price difference between the P- and C-lines which is reflected in bicycle manufacturer's pricing. In terms of quality, the C-line does not differ from the P-line. For the C-line gearbox, we offer a free warranty extension from two to three years. Find out more here: