HD models are all sub groups of the diff engine/chassis config. In the Big engine range, you have the Dynas (FXDF, FXD, FXDL FXDC etc etc), all have their engine mounted on rubber blocks to isolate the vibration.
Then you have the FLH family (FLHR, FLHTCU, FLHX etc etc), once again, rubber mounted engine, buy very diff to the Dyna in the chassis.
Last but not least, you have the Softail family (FLSTF, FLSTC, FXSTC etc etc). The Softail family have a diff engine to the rubber mount models. They use two counter rotating balace shafts to reduce vibration, so mount their engines directly to the chassis, as the rubber mounts aren't needed. This makes their chassis tighter than the rubber mounted jobs, and their best handling big engine one. In the Softail family, a model with FL at the beginning means it's got the fat front tyre, and any model that starts with FX is the 21" front wheel.
People will argue the point until they're blue in the face that the Dyna's handle better. But that's ok. We can all be wrong sometimes.
Sportys used to be rigid mounted engines, but in 2004, they rubber mounted them. The handle better than the big boys.
The V-Rod family is a whole diff kettle of tuna.
Hope that helps a lil!
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