I am wondering if there are any way to put a wider rim under my 97 Kat to get rid of the 3.5" bicycle rim that is now under the rear. This seams really narrow. I run a 140/80/17 now and currently have the rubber off awaiting a new tire. Before I by another I was wondering can I fit a different rim under it or possibly change to a little wider tire and still be safe. Any info would be greatly appreciated.