Opus Bikes Size Chart The Spark aluminum adventure bike is designed to take you anyplace you want to explore. Through axles, disc brakes and generous tire clearance deliver comfort and control in all conditions. Meanwhile, the Spark's lower bottom bracket and longer stays give you greater stability for when the pavement ends and the fun begins. And for even more versatility in the back-country, try the Spark 4 Adventure Edition. With its full fenders and sturdy rear rack, it's your perfect dirt touring companion. Features: - Shimano Claris 8 gruppo - Promax Decode R twin piston disc brakes - Full fenders and reliable Blackburn Local rear rack - Frame: Meta 30 6061 aluminum - Fork: Full carbon tapered 1-1/4" to 1-1/8" - Shifters: Shimano Claris 2 X 8 - Front derailleur: Shimano Claris - Rear derailleur: Shimano Claris - Brakes: Promax Decode R Flat Mount Twin Piston Disc - Brake levers: Shimano - Crank: Shimano FC-RS200 - Chainrings: 50-34 - Bottom bracket: Shimano Sealed Cartridge - Cassette: Shimano 11-32 - Chain: KMC Z7 - Headset: FSA Orbit Integrated Sealed - Handlebar: Opus Gold Adventure - Stem: Opus Bronze - Grips/Tape: Velo Vexgel - Saddle: Opus Endurance - Seatpost: Opus Bronze 27.2 X 300 - Wheels/Rims: Alex CXD-6 - Hubs: Alex through axle 12mm FR/RR - Tires: Vittoria Graphene 700 X 32 - Pedals: N/A - KCNC through axles - Weight: 26.2 lbs