Busy means there is a lot to think about when your spinning like crazy and trying not to strike the pedals on rocks. I've hung up suddenly enough to go over the bars. If you plan to use it for off road, then get a tooth or two smaller than what you normally run SS. I ordered from tommy, and the turnaround seemed reasonable. He states up front that he only ships orders once a week because he has a real job besides making cogs in his garage.