a condition of maximum gap 69 and no gap at all is minimized this is a desirable feature to assure control between a desired and an actual drive ratio it is also worthy of note that while multiple v section belts were previously known they were usually used as wide belts and their multiple belt teeth served only to prevent the belt from wandering laterally off the pulley for all intents and purposes therefore they were really flat belts furthermore such belts were customarily fabricated of neoprene or of other conventional materials which would wear quickly if subjected to the pinching or wedging effect called for by the present invention it will further be appreciated however that the benefits of the invention need not be restricted to the construction of a multiple v section drive belt indeed as illustrated in fig4 c a modified drive belt 34c having only one v section may be frictionally engageably received between a pair of parallel ribs 66b on the grooved cap 64 in this instance the drive belt 34c is provided with a pair of spaced apart shoulders 34d which engage the tip portions of the ribs 66b and prevent the v section of the drive belt from reaching the deepest region of the crotch or terminal surface 66c between the adjacent ribs 66b the significant advance of the present invention over the state of the art can be even more fully appreciated if reference is made to fig4 d and 4e in conjunction with the following examples fig4 e is a diagrammatic presentation of the drive belt 34 engaged.