Re: New to mb and mixte frame help?
depending how long that seat tube is you mite be able to fit it on the top tube, but i think you'd end up with a huge amount of vibration with it being that close to your body and i question how the chain would work going at that angle, and you mite have clearance issues and probably isn't the safest place for a chain moving that fast considering where your legs would be.
look on craigslist for a good steel frame mountain bike like the ones from the 80s/90s with a straight top tube, or maybe a huffy cranbrook from walmart. i wouldnt personally go for the cranbrook, but lots of others here use em, they're cheap and an easy first build.
good luck and welcome to the forums