probably not strong enough for very hard use but would be great fun down the woods if you dont intend doing too much distance . maybe think about a higher rise bar so you dont feel so hunched over while stood
i had a mate over 6ft who would happily ride 20 miles on a s&m cruiser
its very likely to be made from 4130 chromoly steel
rims look like mavic d521 , a nice strong rim that isnt outrageously heavy