Northampton Bicycle

Always Game

Our take on the ultimate all-round gravel bike. Go anywhere, bring everything and then keep on going.

Model Description

One chainring, endless possibilities. The Topstone 3 GRX - 1X delivers simplicity without sacrificing performance. A Shimano GRX610/820 blended group keeps shifting precise and reliable, while KingPin suspension takes the sting out of rough terrain. WTB tires keep you connected to the trail, making every ride a good one—whether it’s a quick lap or a full-day escapade.

What it's for

Gravel riding & racing, bikepacking, going hard and long on dirt or pavement

Highlights

Lightweight full carbon frameset with Kingpin rear suspension, Proportional Response size-specific construction, and StashPort downtube storage
With a single chainring and wide-range SLX 12-speed cassette, this blend of Shimano’s top-end GRX820 and GRX610 gravel groups offers a killer performance value
Durable, dependable WTB ST i25 rims, with Shimano hubs and WTB Riddler 45c gravel tires
Cannondale 3 flared handlebars offer comfortable, gravel-friendly hand positions

Specs

DETAILS

Platform
Topstone Carbon
Model Name
Topstone Carbon 3 GRX - 1x
Model Code
C15195U

FRAMESET

Frame
Topstone Carbon, Kingpin suspension system, Proportional Response construction, downtube Stashport, internal cable routing, 12x142mm thru-axle, 27.2 dropper post ready, UDH, BSA 68mm threaded BB, flat mount disc, 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
Acros IS52/40 ICR

DRIVETRAIN

Rear Derailleur
Shimano GRX 822, Shadow SGS
Shifters
Shimano GRX 610, 12-speed
Chain
Shimano M7100, 12-speed
Crank
Shimano GRX 610, 40T
Rear Cogs
Shimano SLX M7100, 10-51, 12-speed
Bottom Bracket
Shimano BSA 68

BRAKES

Brakes
Shimano GRX 610 hydraulic disc, 160/160mm RT70 rotors
Brake Levers
Shimano GRX 610 hydraulic disc

WHEELS

Rims
WTB ST i25 TCS, 28h, tubeless ready
Spokes
Stainless Steel, 14g
Tire Size
45
Wheel Size
700c
Hubs
(F) Shimano TC500, 12x100mm centerlock / (R) Shimano TC500, 12x142mm centerlock
Tires
WTB Riddler TCS Light, 700x45c, tubeless ready

COMPONENTS

Handlebar
Cannondale 3, butted 6061 Alloy, 16 deg flare drop
Stem
Cannondale C1 Conceal, Alloy, 31.8, -6°
Grips
Cannondale KnurlCork, 2.7mm
Saddle
Selle Royal SRX Open
Seatpost
Cannondale 3, 6061 Alloy, 27.2x350mm

EXTRA

Extra 1
Large StashBag downtube storage bag, tubeless valve stems

SAFETY INFORMATION

Ingestion Hazard

WARNING - INGESTION HAZARD: This product contains a button cell or coin battery. DEATH or serious injury can occur if ingested. A swallowed button cell or coin battery can cause Internal Chemical Burns in as little as 2 hours. KEEPnew and used batteries OUT OF REACH OF CHILDREN.Seek immediate medical attention if a battery is suspected to be swallowed or inserted inside any part of the body.