Over-locknut dimension (hub distance) (cup depth) changed after 10.000km Recently I wanted to replace my bearings and spotted something strange.

My Over Locknut Dimension has reduced by 7mm.

You can spot the difference when you compare it to the new hub:



Can this happen if the bearings are set too tight?

Old cup is obviously damaged:



Also one very important fact, my quick release axle was broken :) :



So I wanted to know what is the main reason that caused the OLD reduction by 7mm? Did anyone else had similar experience?

Hub model: QUANDO KT-A12R / QR Type for Freewheel



EDITs

Dimension that I'm referring to is the "M" according to this image

Inside distance(edit) of the hub is reduced by 7mm (non-drive side bearings - drive side bearings). Depth of the cup has increased by 7mm.

OLD with the original hub is 135mm.

If I use the same spacers O.L.D for the used hub is ~128mm.

O.L.D measurement

BTW I am heavy guy - 105kg, 2m tall, that explains axle breakdown :)
So it is not a diameter, it is distance! 135 mm is a classic value for rear MTB wheels with 8-11 speed cassettes. 128 mm sounds more like a hub with freewheel would have however. 

O.L.D. is a parameter for the axle (over the locknuts distance), not the hub shell width you show on the pictures. Having more washers or thicker cone washers on the old hub might explain the difference you see.