Profile Imperial sprockets are CNC machined from 6061 Aluminum made in the USA. The Imperial isbolt on inches style and requires a sprocket bolt to be attached to crank arm.
All Profile chainwheels have a .875" spindle hole with adapter to fit 0.75" spindles - they do not fit 1 or 2-piece cranks
3/32 inches teeth for 3/32 inches and 1/8 inches chains
