28 Hole Count - 6 Bolts - Micro Spline. Hailing from the iconic i9 Enduro product family, versatility is the name of the game with the Enduro S Series. Built with a 30.5mm inner rim width, 1/1 Enduro S yields the rider double black pedigree, meanwhile capable of handling all day epics without complaint. You can have it all with 1/1 Enduro S. Please note, 1/1 Enduro wheels are available with Boost or Super Boost hubs only. 6 Bolt or Center Lock available.