any excess extension beyond the side of the cart the heel guard means provided includes a pair of angularly bent rods 60 each rod 60 having a lower end portion welded to the inner face of the vertical flange 56 of the footrest 54 to one side of the center thereof the rods 60 then extend upwardly diverging slightly and terminating in upper portions which project in a generally opposed horizontal directions laterally to the adjoining frame rod 30 at which point each rod 60 is welded to the rod 30 it is of course contemplated that the configuration and orientation of each heel guard rod 60 be such as to preclude passage of the heel or rear portion of a rider 39 s foot therebeyond a further protection against inward passage of the foot of the rider is provided by a rigid vertical bar 62 pivoted to the footrest flange 56 between the guard rods 60 by appropriate pivot pin means 64 the bar 62 extends slightly below the pivot pin 64 and mounts a second pin means 66 which extends through an arcuate adjustment of the bar 62 either one or both of the pin means 64 and 66 may be of a type which can be tightened so as to lock the bar 62 in an adjusted position the upper portion of the bar 62 has an elongated slot 70 centrally therethrough slidably mounted in this slot is lock means 72 which through the adjustment provided by the slot 70 and the arcuate movement of the bar 62 can exactly align with the projected threaded end of the wheel axle 74 such as is conventionally provided on jog cart wheels this threaded axle is quite similar to that found on conventional bicycles the lock means.