The AMP Research B4 XT is a 24 pound a mountain bike with an aluminum and steel T6 / AMP frame. The frame comes in colors like red, polished and ball-burnished.

The B4 XT is a is a lighter bike at around 25 pounds. It was first released in 1995 and again in 1996. The B4 XT has frame suspension with 2.75in travel and has saddle suspension.

Components

The B4 XT comes with Shimano Deore XT components, including a Control Tech stem, a Shimano Deore XT headset and Shimano Deore XT RapidFire shifters.

Drivetrain

The B4 XT has 8 speeds and has a Shimano Deore XT derailleur.

Wheels

It comes with Hutchinson tires (26in x 1.95in) and Sun Metal CR18 Mavic M231 rims.