Adventure Bike with a Reynolds Steel Frame Built with a Reynolds 725 Heat-Treated Chrome-Moly double-butted steel frame from the legendary British tubing manufacturers, paired to carbon fork, and designed to take both 700c and 650b wheels & tyres, the possibilities with this bike are endless. The Substance offers you a new way to ride. Shimano GRX Gravel Bike Groupset Featuring a tapered headtube, and full T-700 UD carbon forks, the Substance steel is born tough. This bike is made for round-the-world adventure or dependable and comfortable commuting. With the addition of mounts for mudguards, luggage, and multiple bottles it’s also capable of going anywhere for any amount of time. The Substance SRS-2 is fitted with Shimano’s GRX 600 groupset – the world’s first dedicated gravel groupset. Paired with the GRX 810 rear mech, this 11 speed 2X groupset delivers a smooth and quiet drivetrain, specifically tuned for gravel/adventure riding. Wide, High-Grip WTB Gravel Tyres The Substance SRS-2 is fitted with WTB SpeedTerra 650b TCS wheels, with big volume WTB Venture TCS 47mm tyres. 650b is perfect for adventure cycling with the large outer diameter keeping your wheels rolling over bumps, whilst the added tyre volume allows you to adjust pressures depending on the terrain for grip, comfort, and luggage weight. The finishing kit is made up of a Vitus 6061 aluminium handlebar, stem, and seat post. The handlebars feature a flat top section for added comfort on and off-road, with the Substance SRS-2 featuring a 16-degree bar flare. Please Note: This bike has a max tyre clearance of 650b x 47c Or 700 x 42c Built, Tuned and Ready to Ride Rest assured that each bike is fully built and tuned by Wiggle’s team of qualified bike mechanics to ensure your bike arrives in perfect condition. We supply all bikes with a set of plastic pedals, a pedal wrench and a multi-tool kit. Find out which size fits you by clicking the size chart tab.