I found this bike on Craigslist, always a sucker for chain stay mounted u-brake vintage bikes. Bristol Avenger MTB, I am guessing late 80's bike. Some neat features dual down tube water bottle mounts and maybe shoulder strap braze on the top and seat tube.
I have never heard of Bristol, maybe from the UK? Anyone? Bueller?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Bristol Avenger MTB