[Jeir]

I recently bought the P@H large wooden wheel to replace my Fluffy's Trixie. If you plan on using the penthouse and shelves, you will have trouble getting it to fit; I couldn't. If it wasn't up against the pink shelf, it was rubbing against the tube coming down from the penthouse.
If you don't use the penthouse, then it should fit, although the large door in the front will be mostly blocked. XD

The Trixie wheel does fit fine, though, without blocking the entire door, and I bought another one yesterday off Amazon for a little over £11...as shown in Serendipity's link. For a hamster that weighs 150-210g, it works fine, although after a year or so it may need replacing, as mine does.