2025 Topstone 3 GRX (Custom)
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Local pickup only: This bike is available for pickup at our Provo, UT shop. We're unable to ship bikes at this time.
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The Topstone 3 isn't bound by terrain or tradition. Its SmartForm C2 Alloy frame melds strength and finesse,
What it's for: Gravel-riding, exploring, bikepacking, performance commuting
Straightforward, reliable and a whole hell of a lotta fun, the Topstone Alloy is a gravel bike crafted for those with a taste for adventure – and value. Roll light and free, or load it up for a long haul, Topstone's comfortable ride, confident handling and up-for-anything capability make it the perfect partner on any road, anywhere.
Clearance for big 50mm tires lets you push further into the rough stuff, and enjoy more grip and comfort on every ride.
The following changes have been made: Complete Groupset & Brakeset swap over
Shimano GRX 12 Speed Mechanical Derailleur
Shimano GRX Mechanical Brake/Shifter 12s Right
Shimano GRX Mechanical Brake/Shifter Left
Shimano GRX Hydraulic Brake Calipers Right
Shimano GRX Hydraulic Brake Calipers Left
Sram Nx 12 Speed Cassette 11-50t
Maxxis Rambler 700x50 Exo TR tires Front
Maxxis Rambler 700x40 Exo TR tires Rear
Features
- Lightweight SmartForm C2 Alloy frame w/ full carbon fork
- Smooth, high end reliable shifting from the Shimano GRX groupset
- Powerful, hydraulic brakes from Shimano GRX
- Selle Royal SRX Open saddle balances supportive padding and a pressure-relieving central channel for performance comfort
Tech Specs
| Platform | Topstone Alloy |
| Model Name | Topstone 3 |
| Model Code | C15215U |
| Frame | Topstone, lightweight SmartForm C2 Alloy, 12x142 thru-axle, tapered headtube, BSA threaded BB, flat mount disc, StraightShot internal cable routing, multiple gear/bottle mounts |
| Fork | Topstone Carbon, 1-1/8 in. to 1.5 in. steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru-axle, triple bottle/gear mounts, fender mounts |
| Headset | Integrated, 1-1/8 in. - 1.5 in. |
| Rear Derailleur | Shimano GRX 12 Speed |
| Shifters | Shimano GRX 12 Speed |
| Chain | Shimano 12 Speed |
| Crank | Prowheel Charm, 40T |
| Rear Cogs | Sram NX cassette 11-50t |
| Bottom Bracket | FSA cartridge, square taper |
| Brakes | Shimano GRX Hydraulic, 160/160mm centerlock rotors |
| Brake Levers | Shimano GRX |
| Front Hub | Shimano TC500, 12x100mm centerlock |
| Rear Hub | Shimano TC500, 12x142mm centerlock |
| Rims | GXD 1.0, 28h, 23mm internal width, tubeless ready |
| Spokes | Stainless Steel, 14g |
| Tire Size | 37 |
| Wheel Size | 700c |
| Tires | Maxxis Rambler EXO, 700x40c, tubeless ready |
| Front Tire | Maxxis Rambler EXO, 700x50c, tubeless ready |
| Rear Tire | Maxxis Rambler EXO, 700x40c, tubeless ready |
| Handlebar | Cannondale 3, butted 6061 Alloy, 16 deg flare drop: 400mm (XS), 420mm (SM-MD), 440mm (LG-XL) |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7°: 80mm (XS), 90mm (SM-MD), 100mm (LG-XL) |
| Grips | Cannondale KnurlCork, 2.7mm |
| Saddle | Selle Royal SRX Open |
| Seatpost | Cannondale 3, 6061 Alloy, 27.2x350mm |
| Extra | Tubeless valves |
| Note | Please note that, based on component availability and other factors, specifications are subject to change without notice. |
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