Timing Belt Calculators A collection of tools to help design well toleranced belt systems for FRC and FTC robots. Belt Length Calculator Belt Pitch 2mm (GT2) 3mm (HTD) 5mm (HTD) 1/4" (RT25) Small Pulley Teeth (T1) Large Pulley Teeth (T2) Center Distance mm inches Calculate Belt Length Center Distance Calculator Belt Pitch 2mm (GT2) 3mm (HTD) 5mm (HTD) 1/4" (RT25) Small Pulley Teeth (T1) Large Pulley Teeth (T2) Belt Length teeth mm inches Calculate Center Distance