This may be a silly question but... If I wanted to change or upgrade my chainring on my Truvativ Touro (example below) to something like this SRAM below or similar ones like the FSA ones, could I? The reason I'm asking is because the chainring on the Touro mounts on the back of the arm whereas other arms like the Sugino Messenger (which also has a flat or aero-ish ring) mount their rings on the front. Does this matter as long as the BCD is the same?

http://farm4.staticflickr.com/3723/9...2b1aac1b_z.jpg

http://ecx.images-amazon.com/images/I/41JY1BxJwdL.jpg