WORKSHOP TOOL ยท DRIVETRAIN PREPARATION
Bicycle Chain Length Calculator
Calculate the exact number of chain links needed for your drivetrain configuration using precise chainstay geometry and derailleur capacity requirements.
1. Drivetrain & Frame Geometry
Recommended Chain Sizing
RECOMMENDED TOTAL CHAIN LENGTH
116 Links
115 standard links + 1 Quick-Link (Master Link)
Pin-to-pin physical length
147.3 cm
58.0 inches total length
Derailleur capacity needed
40 Teeth
Total tooth wrap requirement
Recommended cage length
Long Cage
SGS cage recommended
Chainstay in pitch units
34.25 Links
1/2″ pitch spacing count
Quick-Link & Master Link Assembly
When sizing a brand-new chain using a Quick-Link / PowerLock, cut the outer plates so you are left with two inner link ends, then install the master link to complete the 116-link circuit.
Drivetrain Sizing Rules
- Standard Equation: Calculates $L = 2(CS) + \frac{F_{max}}{4} + \frac{R_{max}}{4} + 1$, then rounds UP to the nearest even integer to accommodate alternating inner and outer link plates.
- Full-Suspension Bikes: Measure chainstay length at maximum chain-growth axle path travel (suspension fully compressed) to prevent derailleur damage.
Drivetrain Wrap Note: Your setup requires 40T of tooth wrap capacity. Verify that your rear derailleur specification matches or exceeds this capacity to prevent chain slack in small-small gear combinations.
Runs locally in your browser. Calculations are based on standard 1/2″ (12.7mm) bicycle pitch geometry formulas. Always verify derailleur clearance manually before riding.