I have a 1997 Bob Jackson Messina, beautiful lugged frame that's going to be converted to a singlespeed. The cranks are Shimano Ultegra which came with the 8 speed groupo. My large chainring is a 53 and my smaller one is a 46. I'd like to move the 46 over to the outside and use it as my drive gear. I'll be using the ultegra rear cassette that's already on the bike. Is there any reason I can't simply mount the 46 on the outside of the crank where the 53 current lives?