Lightly used this is grade A mechanical and grade B visually with cosmetic marking - previously in sporadic use on a child’s bike who changed to 7 speed. 14-28 ratio estimated mileage from experience of looking at Shimano gears and working with them for many years - easily less than 300 miles. Free Postage and covered by our no quibble boingbiking.com free 1 yr return policy.