I've been running Nobl TR 32's for the last year on my XC bike. I started out with 2.4 Rekons on the front and 2.25 Rekon Race on the rear with no issues. I've since changed to 2.35 Ikons up front and 2.2 Ikons out back. Maxxis recommends a 25 - 30mm IW rim for the 2.4 Rekon with 30mm being optimal. My suggestion would be that if your riding is more XC-oriented you'll be fine with the TR32's. If you're riding is geared toward more rugged terrain, you'll probably be better off with a wider rim.