Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Bike Spoke Length Calculator

Calculate the exact spoke length needed for any wheel build from rim ERD, hub flange dimensions, and lacing pattern. Essential before ordering spokes for a custom or replacement wheel.

Rim ERD (Effective Rim Diameter) (mm)

Hub PCD (Pitch Circle Diameter) (mm)

Flange Offset from Center (mm)

Spoke Count

Cross Pattern

Fill in the required fields to see your result.

Cycling

Bike Chain Length Calculator

Determine the correct number of chain links for your bike's drivetrain using chainstay length and sprocket sizes. Essential when installing a new chain or changing gearing.

Largest Chainring (teeth)

Largest Rear Cog (teeth)

Chainstay Length (mm)

Fill in the required fields to see your result.

Key differences

	Bike Spoke Length Calculator	Bike Chain Length Calculator
Category	Cycling	Cycling
Inputs required	5	3
Result	Spoke Length (mm)	Chain Length (links)
What it does	Calculate the exact spoke length needed for any wheel build from rim ERD, hub flange dimensions, and lacing pattern. Essential before ordering spokes for a custom or replacement wheel.	Determine the correct number of chain links for your bike's drivetrain using chainstay length and sprocket sizes. Essential when installing a new chain or changing gearing.