I was wondering if anyone had a dumbed down explanation on what's the difference in all their shocks? I see 412, 418, 430,440 and 812s all fitting my bike, dunno whats the difference really

 

Unlike the OEM shocks and fork springs, they have multiple spring rates (Kgm/Centimeter compression) available. They also use different valving in the shocks to cause more consistent damping across the shock action range. Depending on how complex and involved you want to get, you can get forks with full race cartridges in them that have full damping and adjustments, etc.

The OEMs put together parts that fit the common denominator and averages. For instance, in the spec sheets on the bikes, Harley assumes a 180lb rider when measuring seat height. They can't cover all the bases, so the aftermarket is ripe with customized and customizable solutions for various riders, riding styles, etc.

 

I don't really have a "dumbed version" for you other than what can be found on Progressive's website but,general opinion both here and from the suppliers"in the know" is thatthe 412's are the way to go unless you want to spend big bucks to go to air shocks. A sportster is never going to ride like a touring bike nor was it designed to.