Tools you might need next
Estimate cycling power from speed, gradient, and rider weight (simplified model). Free cycling power (watts) calculator for road cycling, bike fitment.
Estimate Functional Threshold Power from a 20-minute test. Free cycling ftp estimate calculator for road cycling, bike fitment, and power training.
Calculate gear ratio, gear inches, and development from chainring and cog. Free cycling gear ratio calculator for road cycling, bike fitment.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
New position = Frame stack/reach + spacers + stem geometryThe calculation requires: Frame Stack (mm), Frame Reach (mm), Spacer Height (mm), Stem Length (mm), Stem Angle (degrees). Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
Ensure denominator values (divisors) are non-zero. The calculator validates this, but understanding which fields cannot be zero helps interpret results correctly.
Calculate effective stack and reach from frame and cockpit setup. Free bike fit stack & reach calculator for road cycling, bike fitment, and power training. It applies the calculation formula (New position = Frame stack/reach + spacers + stem geometry). For example: 545/385 frame, 20 mm spacers, 100 mm -6° stem — A typical use case demonstrating the calculator with representative values.