The AMP Research B4 All Country XTR is a 24 pound a full-suspension mountain bike with an aluminum Alcoa T6 / AMP Research frame. The frame comes in red or polished.

The B4 All Country XTR is a is a lighter bike at around 25 pounds. It was first released in 2000 and again in 2001 for $1,875 brand new.

Components

The B4 All Country XTR comes with Shimano XTR components, including an aluminum stem, a threadless Aheadset headset and Shimano XTR RapidFire SL shifters.

Drivetrain

The B4 All Country XTR has 9 speeds and has a Shimano XTR derailleur.

Wheels

It comes with Specialized Team tires ( x in front and x rear.) and Sun Rims CR18 rims.