Syrian tank

[Sarahbean]

Hi all! I am heading out tomorrow to get a glass tank for my Syrian hammy, Banjo, at a local small chain pet store. They have a room filled with inexpensive used tanks (also sell many new wire mesh lids), and I almost bought one today- but decided to wait and ask what size sounds like it would work well and lower her stress.
She has a 12 inch silent spinner which is actually about 15 inches with the stand and it takes up so much room in her small cage. She is in a small (tiny!!) wire cage connected to a bin cage I made to accommodate her large wheel. The only problem with that is the only bin tall enough to fit the wheel was smaller than I initially wanted in the floor area. Because of this, as Banjo grows she's starting to get really stressed from what could only be the cage.
I have had many Syrians before, one doing very well in a tank (~gave the tank to a friend so I no longer own it~) but he did have the silent spinner in a size down; as you all probably know, the 12 inch is a very large wheel to put on the floor of the cage.

SO WHAT I AM ASKING IS, how many litres/gallons would be appropriate for an average sized Syrian hamster, and would still fit the 15 inch tall wheel comfortably?

[Hamsterita]

I think that people usually recommends a 40 gallon breeder tank. I had a 120 L tank and it was a little bit small. I don't know about inches, but you should look for something that measures about 80x50cm or more. The height should be enough to keep a good layer of substrate and a 20 to 28 cm wheel, but if the tank is big enough you could put the wheel in one side with less substrate and on the other side more substrate, so 40 cm could do the trick.