- Replacement freehub bodies include pawls and springs pre-installed - M-Pulse hubs: six pawls are equipped with Neodymium magnets engaging every 1.66 deg - E-Sync hubs: fast 8.18 deg engagement with reinforced high-torque pawls - HG 11sp road FH body requires a 1.8mm spacer (included) for use with a Shimano/SRAM 8-11sp HG mountain cassettes - XDR drivers require a 1.8mm spacer (included) for use with a XD cassette - Instructions and hub axle determinations are available online @ www.notubes.com