i am lucky that i don't need a beater bike, and by that i mean that i don't ever have to lock a bike anywhere, it's at home or in the van on the way to ride somewhere but a few years ago i started riding to work in the summer for nightshifts, that's when i built what i considered a beater, an old Orange aluminium O, random mix of parts but it rode well. i liked it too much and restored it and that was my last beater!
so the problem became, buy something to build as a beater, realise i like it, then restore it, then realise "i need a beater" that's how i got to having 20 bikes! :facepalm:
the nearest thing i have to a beater now is my 2nd P7, my first is pretty much a factory spec 95 nickel P7 with m737 XT but my 2nd P7 is a 94 nickel powdercoated white and built with mostly m739 XT, it rides really well and as it's powdercoated i am happy getting it covered in mud etc without worrying about the nickel plating getting ruined like i was with the other one.