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It has been done before. I'd say it very much depends on your skill level and personal risk assessment
I think you can fit cyclocross tyres in a Steamroller?
This old website suggests 63" as being the best overall gear for offroad, which sounds about
right
http://www.63xc.com/faq/faq.htm#whycall
There's also this thread on here for advice, unless you're already familiar with it?
https://www.lfgss.com/conversations/346275/
I'd really advise against brakeless though
For someone who has never ridden on anything but tarmac, would it be foolish to come with a fixed, and if so, what gear ratio? My steamroller is already my best candidate for the forest.