you have it about right,. now when you get a new belt , check width of belt, old and the new one, best is 25.2 MM. lenth around belt is 1004 MM., most belts I have bought are 24.5 MM. Min. size 24 MM. so there is not to much to wear out,. I have worn my belts to 23 MM. but the RPM . go,s up,. as it wears,.