Cannondale Topstone Alloy geometryGravel · 2026 · 5 sizes, from XS to XL
The Cannondale Topstone Alloy is a gravel bike available in 5 sizes, from XS to XL. Stack ranges from 518 to 640 mm and reach from 368 to 402 mm. Its geometry is tall and short, built for comfort. All sizes share 435 mm chainstays. Data from 2026; geometry from 2025 is also available.
What size Topstone Alloy 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 Cannondale. The ones that matter most for choosing a size are in bold.
| Size | XS | SM | MD | LG | XL |
|---|---|---|---|---|---|
| Stack | 518 | 549 | 579 | 610 | 640 |
| Reach | 368 | 377 | 385 | 394 | 402 |
| Effective top tube | 533 | 544 | 557 | 572 | 587 |
| Head tube length | 86 | 115 | 147 | 180 | 212 |
| Head angle | 70.0° | 71.0° | 71.0° | 71.0° | 71.0° |
| Effective seat angle | 73.1° | 73.1° | 73.1° | 73.1° | 73.1° |
| Actual seat angle | 71.8° | 71.8° | 71.8° | 71.8° | 71.8° |
| Chainstay length | 435 | 435 | 435 | 435 | 435 |
| Wheelbase | 1,016 | 1,027 | 1,045 | 1,065 | 1,083 |
| Front centre | 593 | 603 | 621 | 641 | 659 |
| BB drop | 75 | 75 | 75 | 75 | 75 |
| BB height | 280 | 284 | 284 | 284 | 280 |
| Fork offset | 55 | 55 | 55 | 55 | 55 |
| Trail | 72 | 65 | 65 | 65 | 65 |
| Standover | 703 | 744 | 784 | 824 | 864 |
| Seat tube (method not stated) | 410 | 458 | 505 | 553 | 600 |
Source: Cannondale 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 gravel bikes. Further right means more of that quality.
Bikes with similar geometry (size MD)
The closest size of other gravel models, by stack and reach.
Frequently asked questions
What size Topstone Alloy 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 518/368 mm in size XS to 640/402 mm in size XL). 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 Topstone Alloy in size MD?
Stack of 579 mm and reach of 385 mm, with an effective top tube of 557 mm and a head angle of 71.0°.
Is the Topstone Alloy a racing or an endurance bike?
Endurance. In size MD its stack-to-reach ratio is at percentile 71 of gravel bikes: a tall, short position.