Chain Calculators A collection of tools to help design well toleranced chain systems for FRC and FTC robots. Chain Length Calculator Chain Type #25 Chain (0.25") #35 Chain (0.375") 8mm Chain Small Sprocket Teeth (T1) Large Sprocket Teeth (T2) Center Distance mm inches Allow Half Links Calculate Chain Length Chain Center Distance Calculator Chain Type #25 Chain (0.25") #35 Chain (0.375") 8mm Chain Small Sprocket Teeth (T1) Large Sprocket Teeth (T2) Chain Length Allow Half Links Calculate Center Distance