ACROS NINETEEN hubs – Compatibility with Rock Shox Torque Caps Posted by msander on 8. February 2017 Rockshox has increased the diameter of their hub end caps for newer ENDURO and BOOST forks. The thus created larger contact surface between hub and fork provides more stiffness than normal end caps. normal end cap TA15 torque end cap TA15 In the near future we will offer Torque Cap conversion kits for the hub typs NINETEEN FR, ED and XC. RockShox forks with Torque Cap mount can also be driven with normal TA15 end caps.