This headset will allow you to alter your top-tube length by +/- 6mm.
Fits headtube internal diameter: Upper - 56mm: ZS56
Fits headtube internal diameter: Lower - 56mm: ZS56
Upper cup insertion depth: 11.5mm
Lower cup insertion depth: 11.5mm
Upper cup Stack height: 3.5mm - Total upper stack height including bearing cover: 9.5mm
Lower cup Stack height: 3.5mm
Upper Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
Lower Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing
To suit standard 1 1/8"
Includes
2x Headcups
2x Bearings
1x Crown Race
1x Upper Bearing Cover
1x Topcap including Star-Nut
1x Compression Ring and Spacer