The ATX Eclipse Mountain Bike by Giant is a versatile flat - bar option, ideal for all terrains, from parkways to paved or dirt roads. This lightweight, aluminum bike is durable and ideal for off - road surfaces. Key Specifications Frame ALUXX - Grade Aluminum Wheel Size 27.5 inches Shifter EF41 3x7 Brakeset MTB Alloy Linear Pull Brake Levers Shimano EF41 or Microshift Front Derailleur Shimano Tourney