Old thread but maybe useful to someone. I've used 50mm Big Apples on my Crosscheck and they work well without a prob even with fenders too. They are really excellent tires that I recommend for anyone to try out. The tire/rim charts err on the side of caution, but as long as you don't max the psi on the tire, you should be fine. I keep mine between 35-45psi.

Here are some pics. I've used them on both of my crosschecks with different rims.

With stock rims


With Mavic Open Pros


With Salsa Delgados



With Aerospokes on my fixed gear