Ibis - One of the original little guy bike companies that hasn't sold out, like all the others. No matter how much they wish they could.

Illegal trails -There are lots of them. Lots of mountain bikers ride them. We're told not to. Here's a question: why is that skateboarders consider it a badge of pride to skate where they want; why is it that out-of-bounds snowboarding is seen as an act of foolish bravery? No need for a stupid answer is there....

IMBA - International Mountain Biking Association. An organization for trail advocacy.

Impedimentia - all the junk on a bike that impeeds performance and looks bad.

Independent fabrications -One of the last great New England steel bike makers. Though Fat City - the company from which IF's torchmasters spring from - is back on track, IndyFab are the guys carrying the Boston flame into the next century. One if by land.

Insane Wayne Croasdale -The ultimate early 1990s shredder - Insane Wayne epitomized the "wild man" era of downhilling. And everybody on the circuit ogled his really foxy wife, too. Yep, Wayne was a lucky guy.

Intervals - a structured method of training that alternates relatively short, hard efforts with recovery periods of much easier riding. .

Involuntary Dismount - a crash.