The 15 mm thru-axle hub is ideally suited to 26âÂ/700C wheels at 6V3W output and perfect for centerlock disc brakes.We have developed a centerlock version of 15 mm thru-axle as PL-6 to our broader audience. The heart of PL-6 is the unique dynamo rated 78% efficiency at 15km/h. PL-6 is also parsimonious with your physical exertions.