ACS Maindrive Sealed Threadless Headset - 1-1/8" - Black Multi-Speed Freewheel It has classic 4 hole

It has classic 4 hole dropouts for use with 100mm OLD hubs

It is constructed of lightweight aluminum

This tire is slightly fatter tire than the 24x1-1/4" (32-547)

Includes threaded alloy threaded compression cap

Certified Level 1 impact protection - CE EN 1621-1:2012t

ACS Maindrive Sealed Threadless Headset - 1-1/8" - Black Multi-Speed Freewheel It has classic 4 holeThe ACS Maindrive headset features hybrid aluminum and steel construction. The top cap, upper bearing cover and lower race are CNC machined from aluminum alloy while the cups are made from steel. This construction results in a high quality headset at a lower cost. Each headset is fitted with smooth rolling bearings and includes a star nut and matching aluminum top cap. Size: 1 1 8" threadless Color: Black