Is anyone running a ENO 2 speed freewheel with only one chainring up front? I'm assuming I could set my chainline smack in the middle of the 2 rear cogs and be ok running either gear? Would the offset cause the teeth to wear out quickly, or is that a minor enough offset to work fine? I love the idea of getting one of these. Having my 2 favorite ratio's on the bike at all times makes sense!