Hellfury
The Hellfury is a chopper style motorcycle found only in GTA IV.
It is based on a West Coast Choppers El Diablo series bike and is the vehicle of choice for The Angels of Death. The bike features a flame-based rim design and seems to handle very similarly to the Freeway.
In the mission No Love Lost, the biker Jason is riding a Hellfury when he attempts to escape from Niko Bellic; in the mission Ruff Rider, Jayvon Simson leads Niko on a similar chase.