Gear inch Calculator
NOTE: Large numbers of gears can cause slow loading, especially for people on 56K
Enter chainring sizes:
Outer Chainring
Middle Chainring (or inner if you have double)
Inner Chainring (leave blank for double)

Enter Sprocket Sizes (If you have less than 10 leave the rest blank)


Does your bike Use a Schlumpf drive system?
None   Mountain Drive   Speed Drive   High Speed Drive  

Does your bike Use a SRAM Dual-drive hub?
None   Yes  

Select rear wheel size
OR enter wheel size
Your ideal cadence (for speeds) (can be left blank)
speed (MPH) (for cadences) (can be left blank)