White Industries freewheels are designed to be rebuildable rather than disposable.  If you ride a lot, eventually you are going to need a new outer gear.  We recommend replacing your chain when replacing your outer gear because worn out chains don’t usually work well with new outer gears.  Please read all the information below to make sure you choose the correct replacement gear for your freewheel.

Specs
Made from electroless nickel-plated 8620 case-hardened steel
Comes with an Enduro chromium steel bearing installed
36 points of engagement
Bearings are ABEC 3 chromium steel, and use a special Mobil XHP222 extra high pressure grease

It’s a good idea to also purchase a new seal and O-ring when replacing your outer gear 

Note: All freewheels can use either 3/32” or ⅛” chains except ENO 16T single and all DOS ENO freewheels which require a 3/32″ chains

Compatibility
If you are replacing your outer freewheel gear with the same model and number of teeth you currently have, just choose the matching part from the dropdown menu.  Easy!  If you are wanting to swap your current outer gear to a different model and/or number of teeth, keep reading…. 

Alll ENO single and DOS ENO double freewheels use the same “diver”.  That means all the outer gears used on both those models are interchangeable.  But note that if you swap to an outer gear with a different number of teeth, you may have to also replace your lockring with one that is compatible with your new outer gear.  Basically, if you’re changing to or from an outer gear with 16 teeth, you’ll need a new lockring.   

Here is a damned handy link... http://0104.nccdn.net/1_5/300/188/182/Freewheel_Disassembly.pdf