Cube Aerium C:68X geometryTime trial / Triathlon · 2026 · 4 sizes, from XS to L
The Cube Aerium C:68X is a time trial / triathlon bike available in 4 sizes, from XS to L. Stack ranges from 487 to 539 mm and reach from 395 to 442 mm. Its position sits between racing and endurance. All sizes share 410 mm chainstays.
What size Aerium C:68X 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 Cube. The ones that matter most for choosing a size are in bold.
| Size | XS | S | M | L |
|---|---|---|---|---|
| Stack | 487 | 497 | 517 | 539 |
| Reach | 395 | 405 | 421 | 442 |
| Effective top tube | 499 | 511 | 531 | 557 |
| Head tube length | 74 | 85 | 106 | 129 |
| Head angle | 72.0° | 72.0° | 72.0° | 72.0° |
| Chainstay length | 410 | 410 | 410 | 410 |
| Wheelbase | 979 | 992 | 1,015 | 1,043 |
| Seat tube (method not stated) | 535 | 545 | 566 | 588 |
| Seat angle (method not stated) | 78.0° | 78.0° | 78.0° | 78.0° |
Source: Cube 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 time trial / triathlon bikes. Further right means more of that quality.
Bikes with similar geometry (size S)
The closest size of other time trial / triathlon models, by stack and reach.
Frequently asked questions
What size Aerium C:68X 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 487/395 mm in size XS to 539/442 mm in size L). 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 Aerium C:68X in size S?
Stack of 497 mm and reach of 405 mm, with an effective top tube of 511 mm and a head angle of 72.0°.
Is the Aerium C:68X a racing or an endurance bike?
In between. In size S its stack-to-reach ratio is at percentile 58 of time trial / triathlon bikes: neither very low nor very tall.
Does it have the same geometry as the Aerium C:68X SLX?
In size S, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.