29" Men's Thruster Excalibur Mountain Bike The 29inch Wheels on the 21 Speed Thruster Excalibur Mountain Bike will help you glide over the rockiest terrain with ease. The Excalibur 29er is equipped with reliable Shimano ST-EF40 Shifters and a deep V alloy rims. SPECS - Alloy Stem - Aluminum Frame - Quick Release Front Wheel - Alloy Crown Suspension Fork - 36 Spoke Hi Profile 29" Alloy Rims - 21 Speed Shimano Shifters & Rear Derailleur - Front Mechanical Disc Brake & Linear Pull Rear Alloy Stem - SHOGUN Rims on bike tires The perfect Mountain bike or just a general bike to run errands, it can handle bumpy roads and pathways.