Hello new to the site and got this frame off of raigslist got it home thinkin I could just replace the sprocket and it looks to be welded on. I was in a hipe when I bought it like ya ill take it not lookin in the sprocket area I knew it was bent but figured they make sprockets everyday and it was really greasy so didn't pay any attention to it. So any help would be GREAT as well as pics from you guys of how its suppose to be it has a 4in rim on it now would like to keep it 4in cuz have a nice set of razor tires id like to put on it. Also looked at OldMiniBikes and they have 4in steel wheels with hubs would they work id replace both so they match.