Sometimes 1" threaded forks use a slightly different size crown race size than what comes stock with a 1" headset. It's always good to measure the crown race on your fork with a set of calipers so you can get the proper fit.
For instance, most 1" Tioga old-school BMX headsets that we sell come with a 26.4mm crown race. If your fork is slightly larger in diameter, you will need to either sand / cut / grind your fork or crown race, or simply just get the correct crown race size.
This is a 27.0mm size crown race.
A note from PlanetBMX- These are the correct crown race size for the 2014 edition Haro Mike Dominguez frame and fork kits, as well as all other year Haro forks that use a 1" threaded headset
Product Code: 14C-2742