I looked at these bikes two years ago, at that time they told me you need to take the rear wheel off to clean and grease the shaft once a week. That's far more work/time then I put into my chain driven bikes. I was also told they only last 8,000 to 10,000 miles. It also takes much more time to R&R the rear wheel as well. Not some thing I like to hear about when I'm coming home in the dark and it's raining. :-( So at that time I asked myself why?