OK...I would like to get my wife a mixte/step through ladies bike that would be decent for some fire trail stuff. What I would like is something with a 26" size wheel like a 650A size that I could easily convert to 650B for a wider tire. Of course it would have to be able to take a wider wheel as well.

Basically something like what Rivendell offers new but on a budget. Like I said I can convert if needed so it does not need to be ready to go by my description.

If this is not doable I will have to look for a step through mountain bike frame but I would prefer to get her something fancier than that.

Any ideas?