Specialized Crux bike fit and size guide
Review the published geometry for the 2025 Specialized Crux, compare supported sizes, and open the TrainCraft calculator with this bike preselected.
Geometry and size breakdown
The calculator button opens the bike step with this model and size already selected. Then enter rider measurements and run the fit report.
| Size | Stack | Reach | Top tube | Head tube | Stem | Crank | Fit calculator |
|---|---|---|---|---|---|---|---|
| 49 | 519 mm | 378 mm | 532 mm | 95 mm | 80 mm | 167.5 mm | Use in calculator |
| 52 | 536 mm | 384 mm | 545 mm | 111 mm | 90 mm | 170 mm | Use in calculator |
| 54 | 555 mm | 390 mm | 557 mm | 130 mm | 90 mm | 172.5 mm | Use in calculator |
| 56 | 576 mm | 398 mm | 570 mm | 151 mm | 100 mm | 172.5 mm | Use in calculator |
| 58 | 598 mm | 406 mm | 582 mm | 173 mm | 100 mm | 175 mm | Use in calculator |
How to use this guide
Start with the size table to narrow the geometry range you actually want. Then open the calculator to compare that geometry against your body dimensions, flexibility, and fit priorities.
The TrainCraft bike fit tool models saddle height, cockpit reach, and bar drop using the frame geometry plus stock cockpit assumptions for the Specialized Crux.
That is more useful than a generic height chart because two sizes can both fit your height while requiring very different stems, spacers, or saddle positions.
FAQ
What sizes are available for the Specialized Crux?
TrainCraft currently tracks these Specialized Crux sizes: 49, 52, 54, 56, 58. The calculator uses each size's published geometry and stock cockpit assumptions to compare fit outcomes.
Can I use the TrainCraft calculator for Specialized Crux sizing?
Yes. Open the calculator from this page to preload the Specialized Crux, then compare sizes against your body measurements, fit priorities, flexibility, and riding posture preferences.
What should I compare on the Specialized Crux before picking a size?
Start with stack, reach, effective top tube, and the stock stem/crank setup. TrainCraft uses those numbers to estimate cockpit reach, bar drop, saddle position, and how much adjustment headroom each size leaves.
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