Factor ONE SP geometryTime trial / Triathlon · 2026 · 5 sizes, from 47 to 58
The Factor ONE SP is a time trial / triathlon bike available in 5 sizes, from 47 to 58. Stack ranges from 503 to 587 mm and reach from 390 to 421 mm. Its geometry is tall and short, built for comfort.
What size ONE SP 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 Factor. The ones that matter most for choosing a size are in bold.
| Size | 47 | 52 | 54 | 56 | 58 |
|---|---|---|---|---|---|
| Stack | 503 | 523 | 542 | 565 | 587 |
| Reach | 390 | 396 | 404 | 412 | 421 |
| Head angle | 72.5° | 73.3° | 73.3° | 73.3° | 73.3° |
| Chainstay length | 405 | 405 | 405 | 405 | 408 |
| Wheelbase | 974 | 974 | 988 | 1,003 | 1,022 |
| BB drop | 77 | 77 | 75 | 75 | 75 |
| Fork offset | 48 | 43 | 43 | 43 | 43 |
| Trail | 57 | 58 | 58 | 58 | 58 |
| Seat angle (method not stated) | 76.5° | 76.0° | 76.0° | 75.5° | 75.5° |
Source: Factor 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 54)
The closest size of other time trial / triathlon models, by stack and reach.
Frequently asked questions
What size ONE SP 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 503/390 mm in size 47 to 587/421 mm in size 58). 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 ONE SP in size 54?
Stack of 542 mm and reach of 404 mm.
Is the ONE SP a racing or an endurance bike?
Endurance. In size 54 its stack-to-reach ratio is at percentile 100 of time trial / triathlon bikes: a tall, short position.