Nothing is impractical with Topstone Carbon 4
The best gravel bike for everything from dirt roads to singletrack trails. With the grip and comfort of Kingpin suspension, nothing is off-limits. With plenty of bottle mounts and frame and fork mounts, the Topstone Carbon is ready to load up and travel the distance. Enter the most treacherous corners with confidence and exit smiling: thanks to the OutFront geometry, Topstone Carbon is stable on rough surfaces while remaining agile and easy to ride in other situations.
Increased comfort without the added weight and complexity of joints and shock absorbers: Kingpin is the answer to the most demanding gravel users. Whether you need more comfort for long rides, more traction for extreme cornering, or more absorption for more technical trails - the Kingpin is the lightweight, maintenance-free answer to your prayers.
Low-friction bushings on the Kingpin suspension thru-axle ensure smooth operation, maintenance-free reliability and a savings of over 100g compared to traditional bearings.
Tire size and compatibility
The new design with lowered chainstays allows you to use tires up to 700x45mm or 27.5x2.1", leaving 6mm of wheel clearance on both sides and with standard camber for easier wheel changes.
Specific for each user
The Proportional Response construction, specific for each size, gives optimal rigidity to each frame size, so as to offer everyone the superb driving feeling for which the Synapse is known.
Frame: Topstone Carbon, Kingpin suspension system, SmartSense compatible, Proportional Response construction, 12x142mm thru-axle, 27.2 dropper post ready, BSA 68mm threaded BB, DirectLine internal cable routing, removable fender bridge, multiple gear/bottle mounts
Fork: Topstone Carbon, 1-1/8" to 1.5" steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru-axle, triple bottle/gear mounts, fender mounts
Headset : Integrated, 1-1/8" - 1-1/2"
Gears: Shimano GRX 400, Shadow RD+
Derailleur: Shimano GRX 400, braze-on
Shift levers: Shimano GRX 400, 10-speed
Chain : KMC X10, 10-speed
Crankset: Shimano GRX 600, 46/30 (Europe/UK - FSA Gossamer Pro Modular AGX+, 46/30)
Cassette: Shimano HG500, 11-34, 10-speed
Bottom Bracket : Shimano BSA 68
Brakes: Shimano GRX 400 hydraulic disc, 160/160mm RT54 rotors
Brake Levers: Shimano GRX 400 hydraulic disc
Rims: WTB ST i23 TCS, 700c, 28h, tubeless ready
Spokes : Stainless Steel, 14g
Tires : WTB Riddler Comp, 700 x 45c (Europe/UK - Vittoria Terreno Dry 700 x 40c)
Tire size: 45
Wheel Size: 700c
Hubs : (F) Formula cartridge bearing, 12x100mm, centerlock / (R) Formula cartridge bearing, 12x142mm, centerlock
Front Tire: WTB Riddler Comp, 700 x 45c
Rear Tire: WTB Riddler Comp, 700 x 45c
Handlebar : Cannondale 3, butted 6061 Alloy, 16 deg flare drop
Stem: Cannondale 3, 6061 Alloy, 31.8, 7°
Grip : Fizik Solocush Soft, 3mm
Saddle : Fizik Aliante Delta, S-alloy rails
Seatpost : Cannondale 3, 6061 Alloy, 27.2 x 350mm
Wheel Sensor : Cannondale Wheel Sensor
Extra1 : StrapRack toolholder