Hello John! This bag has gone through revisions on its design and the handle problems seem to have been fixed!

Yes, this 4 ball roller will offer Large 5" x 2" Smooth KRuze wheels and a wider base for a more sturdy bag

It will fit up to a size 15 in mens. You could put two small pairs in the shoe compartment most likely.

Yes, this will have a locking handle.

Unfortunately, it does not.

With added balls it will be around 61#, without balls it will be half that.

Yes, it does retract.

Yes, it if you click on the link that follows it will direct you to the black/carbon color. https://www.bowling.com/products/hammer-premium-4-ball-roller-black-carbon.htm

This bag will weigh about 15lbs when empty.

Unfortunately, we do not sell replacement wheels, but you can reach out to Hammer and they can send you a replacement wheel!

There will be two large 5" x 2" Smooth KRuze wheels.

Unfortunately we do not have a Hammer 6 ball roller at this time. Here is a link to view our 6 ball rollers: https://www.bowling.com/shopping/all/bowling-bags/6-ball-rollers

We do not sell a replacement handle for this but Hammer may have a handle kit if you needed to get the handle replaced or repaired. They can sometimes help with this under a warranty so you could check with the company you purchased from to try and get this covered under warranty.