Abstract: A reversible spindle embodiment for a small sailboat dolly axle includes 2 spindle elements, one on each end of the same reversible spindle embodiment connected by a central interconnecting mounting element. Each spindle element is designed to mate with a wheel hub having a different size diameter and/or width. The unused spindle element and the central interconnecting mounting element are inserted into the hollow end of the dolly axle and secured with fasteners through the walls of the axle and mounting element. The desired spindle element is inserted through the wheel hub and secured. To mount a wheel having a different hub size matching the unused spindle element, the fasteners are removed, the reversible spindle is rotated 180 degrees and the fasteners reinstalled.

Abstract: One embodiment of a spindle size adapter for dolly axles to provide adaptability to and use of replacement wheels with various axle hub sizes. The spindle size adapter has a proximal end which mates closely into the existing axle frame to stabilize the new axle in the vertical, fore and aft and horizontal position and a distal end that forms the new axle spindle. The size of the adapter spindle is designed to match the most common available hub sizes used in aftermarket dolly wheels but is adapted to different hub sizes by sheathing the spindle with adapter sleeves. The spindle size adapter can be used with or without the original equipment manufacturer (OEM) existing spindle brackets because the manufacture's brackets are not needed to stabilize the spindle adapter. In another embodiment the shape of the middle part of the dolly axle size adapter is modified to be compatible with the form of the OEM axle brackets. Other embodiments allow a variety of spindle sizes and are described and shown.