Colnago C68 Allroad geometryRoad · 2026 · 5 sizes, from 430 to 550
The Colnago C68 Allroad is a road bike available in 5 sizes, from 430 to 550. Stack ranges from 523 to 603 mm and reach from 370 to 393 mm. Its geometry is tall and short, built for comfort.
What size C68 Allroad 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 | 430 | 460 | 490 | 520 | 550 |
|---|---|---|---|---|---|
| Stack | 523 | 543 | 563 | 583 | 603 |
| Reach | 370 | 375 | 380 | 386 | 393 |
| Effective top tube | 506 | 521 | 537 | 554 | 572 |
| Head tube length | 117 | 136 | 157 | 177 | 198 |
| Head angle | 70.6° | 71.0° | 71.5° | 72.0° | 72.5° |
| Chainstay length | 412 | 412 | 415 | 415 | 417 |
| Front centre | 586 | 594 | 602 | 609 | 618 |
| BB drop | 76 | 76 | 74 | 72 | 72 |
| Fork length | 379 | 379 | 379 | 379 | 379 |
| Seat angle (method not stated) | 75.5° | 75.0° | 74.5° | 74.0° | 73.5° |
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 490)
The closest size of other road models, by stack and reach.
Frequently asked questions
What size C68 Allroad 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 523/370 mm in size 430 to 603/393 mm in size 550). 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 Allroad in size 490?
Stack of 563 mm and reach of 380 mm, with an effective top tube of 537 mm and a head angle of 71.5°.
Is the C68 Allroad a racing or an endurance bike?
Endurance. In size 490 its stack-to-reach ratio is at percentile 69 of road bikes: a tall, short position.