Colnago C68 Road geometryRoad · 2026 · 7 sizes, from 420 to 570
The Colnago C68 Road is a road bike available in 7 sizes, from 420 to 570. Stack ranges from 510 to 612 mm and reach from 370 to 410 mm. Its position sits between racing and endurance.
What size C68 Road do I need?
Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.
Enter your stack and reach to see which size fits you best.
Geometry chart by size
Measurements in mm and degrees, as published by Colnago. The ones that matter most for choosing a size are in bold.
| Size | 420 | 455 | 485 | 510 | 530 | 550 | 570 |
|---|---|---|---|---|---|---|---|
| Stack | 510 | 522 | 539 | 557 | 575 | 593 | 612 |
| Reach | 370 | 375 | 383 | 388 | 395 | 403 | 410 |
| Effective top tube | 504 | 517 | 535 | 550 | 567 | 586 | 599 |
| Head tube length | 103 | 114 | 130 | 148 | 164 | 181 | 200 |
| Head angle | 70.6° | 71.0° | 71.5° | 71.8° | 72.5° | 72.9° | 73.1° |
| Chainstay length | 408 | 408 | 408 | 410 | 414 | 414 | 414 |
| Front centre | 576 | 582 | 591 | 599 | 605 | 615 | 625 |
| BB drop | 72 | 72 | 72 | 72 | 72 | 72 | 72 |
| Fork length | 379 | 379 | 379 | 379 | 379 | 379 | 379 |
| Seat angle (method not stated) | 75.5° | 75.0° | 74.5° | 74.0° | 73.5° | 73.0° | 73.0° |
Source: Colnago official website · data from 11 Nov 2026. Spot a mistake?
Stack and reach of every size
Higher means a taller front end; further right means a longer reach. The blue dot is your search.
Character of each size
Compared with other road bikes. Further right means more of that quality.
Bikes with similar geometry (size 510)
The closest size of other road models, by stack and reach.
Frequently asked questions
What size C68 Road do I need?
It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 510/370 mm in size 420 to 612/410 mm in size 570). The size finder on this page shows the closest size and the stem and spacers you would need.
What are the stack and reach of the C68 Road in size 510?
Stack of 557 mm and reach of 388 mm, with an effective top tube of 550 mm and a head angle of 71.8°.
Is the C68 Road a racing or an endurance bike?
In between. In size 510 its stack-to-reach ratio is at percentile 46 of road bikes: neither very low nor very tall.
Does it have the same geometry as the C68 Rim Brake?
In size 510, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.