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We will need some more details... Is it the drive belt or the belt for the blades?it is the drive belt for Murray lawn mower model 38618x92a
no
formulae to calculate the open drive belt
In order to replace the drive belt on a 42 inch cut Murray riding lawn motor, first remove the blade after disconnecting the spark plug. The drive belt is now exposed for easy replacement.
You will have to make sure you park on a flat serface before tightening the motion drive belt of a murray lawn tractor. Remove most of the parts from underneath the tractor until you can reach the belt. Tighten of loosen screws as needed.
belt for 50" Murray lawnmower
A representative copy of a parts manual is linked below.
1251
its 1/2" x 83" inch od
the drive belt is 76 length 1.5 width
Should be 90 inch same as the 1315
75in