COMPATIBLE WITH:
1-1/8" tapered or straight steerer tubes
Aluminum or steel fork steerers
Forks with openings in bottom of the crown
NOT COMPATIBLE WITH:
1" or 1.5" steerer tubes
Carbon fiber steerer tubes
Fork crowns with no opening in the bottom (most road bikes)
Angle-adjust headsets
Most reach-adjust head cups
Top tube e-bike displays less than 61mm from center of steerer