Well i just took my Hardley Davidson for the first shake down . Ran up and down the street a few times and no problems at all .then I decided to take it to my sons house about a 1/5 mile away to let him get the thrill . It is 66cc's of mountian bike mania . on a 26in. frame . He got to ride it around the block and blew the back tube out of the tire . Really sounded cool and left a cloud of dust when she blew . I should have spent the doe on new tubes . Now its back on the bench for new rubber . Ill get there yet .