There's been a lot of discussion here (US guys mostly) about the mileage you'll get from a 210.
Quote "Something else to consider however is tire wear. With a wider tire on the same size rim you will have a narrower contact patch, hence it will wear out sooner. The members who have gone to the 210 average significantly lower miles/tire. "
Many forum members have claimed that their 210s wore out substantially quicker than the 200. Some have claimed that there wasn't much difference.