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. The Opus Spark. Whether it's a club ride or full-day epic, you can take it all in stride. Features: - New Shimano Sora R3000 gruppo with FSA adventure crank - TRP Spyre twin piston disc brakes - Lightweight tubeless ready disc-specific CXD6 wheels - Frame: Meta 30 6061 aluminum - Fork: Full carbon tapered 1-1/4" to 1-1/8" - Shifters: Shimano Sora R3000 2 X 9 - Front derailleur: Shimano Sora R3000 - Rear derailleur: Shimano Sora R3000 - Brakes: TRP Spyre-C Flat Mount Twin Piston Disc - Brake levers: Shimano - Crank: FSA Omega Adventure - Chainrings: XXS-XS 46-30 S-XL 48-32 - Bottom bracket: FSA BB-4000 - Cassette: Shimano 12-28 - Chain: KMC Z99 - Headset: FSA Orbit Integrated Sealed - Handlebar: X-Race Aero 16deg Flare - Stem: Opus Bronze - Grips/Tape: Velo Vexgel - Saddle: Opus Endurance - Seatpost: Opus Silver 27.2 X 300 - Wheels/Rims: Alex CXD-6 - Hubs: Alex through axle 12mm FR/RR - Tires: Vittoria Revolution Graphene 700 X 32 - Pedals: N/A - KCNC through axles - Weight: 22.7 lbs