2025 Topstone 4 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 11 Speed Mechanical Derailleur
Shimano GRX Mechanical Brake/Shifter 11s Right
Shimano GRX Mechanical Brake/Shifter Left
Shimano Deore 11s Speed Cassette
Shimano GRX Hydraulic Brake Calipers Right
Shimano GRX Hydraulic Brake Calipers Left
Maxxis Rambler 700x50 Exo TR tires Front
Teravail Washburn 700x47 TR Rear
Features
- Light, durable SmartForm C2 Alloy Frame w/ full carbon fork
- Upgraded Shimano GRX 1x11 shifting microSHIFT Advent X 10-speed shifting / Promax mechanical disc brakes
- Full Carbon Fork
- OutFront Steering Geometry
- Dropper Ready
- Removable Fender Bridge
Tech Specs
| Platform | Topstone Alloy |
| Model Name | Topstone 4 |
| Model Code | C15801M |
| Frame | SmartForm C2 Alloy, 12x142 thru-axle, tapered headtube, flat mount disc, StraightShot internal cable routing, multiple gear/bottle mounts |
| Fork | BallisTec Full Carbon, 1-1/8 in. to 1-1/4 in. steerer, 55mm OutFront offset, flat mount disc, internal routing, 12x100 thru axle |
| Headset | Integrated, 1-1/8 in. - 1-1/4 in. |
| Rear Derailleur | Shimano GRX 11s |
| Shifters | Shimano 11speed |
| Chain | Shimano 11s |
| Crank | Prowheel, 40T |
| Rear Cogs | Shimano Deore 11speed |
| Bottom Bracket | Cartridge, square taper |
| Brakes | Shimano GRX Hydraulic, 160/160mm rotors |
| Brake Levers | Shimano GRX |
| Front Hub | Formula alloy, 12x100mm |
| Rear Hub | Formula alloy, 12x142mm |
| Brake Type | Disc |
| Rims | RD 2.0, 28h |
| Spokes | Stainless Steel, 14g |
| Wheel Size | 700c |
| Tires Front | Maxxis Rambler EXO TR, 700x50c |
| Tires Front | Teravail Washburn TR700x47c |
| Handlebar | Cannondale 3, butted 6061 alloy, 16 deg flare drop |
| Stem | Cannondale 3, 6061 Alloy, 31.8, 7° |
| Grips | Cannondale Bar Tape, 3.5mm |
| Saddle | Cannondale Stage CX |
| Seatpost | Cannondale 4, 6061 Alloy, 27.2x350mm |
| Extra | Removable fender bridge |
| Note | Please note that, based on component availability and other factors, specifications are subject to change without notice. |
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