This tool is aimed at all LEGO® fans - and LEGO® Technic fans in particular. Use it to calculate final ratio of up to 10 pairs of gears then select the desired type and number of motors to see the theoretical output (speed and torque). Includes 14 sizes of LEGO® gear wheels and 23 various types of LEGO® motors! Also included: a planetary ratio calculator for LEGO gears a gear coupler for finding available gear combinations at given axle spacing and Gearcyclopaedia featuring detailed info on 38 types of LEGO gears®.