Standard Engagement freewheels have 3 pawls and 36 points of engagement
High Engagement freewheels have 6 pawls and 72 points of engagement
Pawls are heat treated S7 tool steel
Driver made from heat treated 4130 steel
Bearings are Enduro chromium steel bearing packed with a special Mobil XHP222 extra high pressure grease
Lockring colors:
Silver, Black, Blue, Gold, Pink, Purple, Red
Freewheel measurements for chainline calculations:
All freewheels are 18.4mm wide
On single freewheels (standard and discontinued Trials) center of teeth are 9mm from the inner base of the threads
On double freewheels inside teeth are 6.1mm from the inner base of the threads and the outside teeth are 11.8mm from the base. Teeth are 5.7mm apart center to center
Compatibility
Works with hubs that have a 1.375” x 24TPI thread
16T single freewheels work with 3/32" chains only, not with 1/8" chains
16T gears do not have enough room at the base for 1/8" chains to sit all the way down on the teeth
Double freewheels work with 3/32" chains only, not with 1/8" chains
1/8 chains are too wide and may rub against the adjacent teeth
17T-22T single freewheels will work with 3/32" or 1/8" chains