change solid axle to hollow axle
I would like to change a solid axle to a hollow, quick release axle. The rear hub has a seven speed freewheel (not cassette). I had a hollow axle from another seven speed bike but the threads are different. I would like to keep the current cones because of the spacing. The dust caps are part of the cones. Could someone educate me as to the various thread types that I might encounter? For reference, what is the thread count for the axle on a Shimano Ultegra 9 speed rear hub?