Frame Size
56 cm
Saddle Height
74.0 cm
Stem
79 mm
Recommended Frame Size
56 cm
Road Bike
Saddle Height
74.0 cm
Stem Length
79 mm
Inputs
Result
33" × 2.54 = 83.8 cm. 83.8 × 0.67 = 56.2 cm frame.
Inputs
Result
31" × 2.54 = 78.7 cm. 78.7 × 0.59 = 46.4 cm frame.
Frame size is based on your inseam length multiplied by a factor that varies by bike type. Road bikes use a 0.67 factor (inseam in cm), while mountain bikes use 0.59 due to their different geometry.
| Inseam (in) | Road (cm) | MTB (cm) | Best Frame |
|---|---|---|---|
| 30" | 51 | 45 | Small |
| 33" | 56 | 50 | Medium |
| 36" | 61 | 54 | Large |
Saddle height is measured from the center of the bottom bracket to the top of the saddle. The 0.883 inseam method (multiply your inseam by 0.883) gives a reliable starting point for road bikes.
Stem length depends on your arm length relative to the frame reach. Most riders use 80–110mm stems. Too short feels twitchy; too long causes neck and back strain.
When between sizes, size down for aggressive riding and size up for comfort. A smaller frame with a longer stem is more responsive; a larger frame with shorter stem is more stable and comfortable.
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Last Updated: Mar 20, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.