I need to change the freewheel and the hub on my road bike and have been looking for a suitable replacement. I wish to keep my rim so I will rebuild the wheel. Also, I want to stay with a 6 speed cassette due to the limits of my current derailleur.
It seems easy to find a 14-28 6-speed freewheel. However, I haven't been able to find a 6-speed freewheel compatible hub, or at least one that states explicitly such compatibility.
My question is:
How do I know that a hub is 6-speed freewheel compatible? What measures do I need to look for to make sure that the cassette will match the length of the hub?
Here's an example of a frewheel that I'd like to match with a new hub http://www.ebay.co.uk/itm/SHIMANO-6-or-7-SPEED-FREEWHEEL-14-28-TEETH-SCREW-ON-NOT-CASSETTE-REAR-WHEEL-/121300234787?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item1c3e0eb223.