I am toying around with replacing my MB-2 with a MB-zip of the same size. Sheldon's site says that these were "prone to failure if ridden hard off road." I was wondering how prone to failure and wondered if there was a weight limit.
I wanted one in the worst way back in 1990 but I went between 195-200 lbs. Everything about that bike appealed to me, frame construction, parts spec, Bridgestone philosophy and the price. I ended up going for a Wicked Fat Chance instead with pretty close to the same spec as the Zip but I always had a yen for one.
I worked for 2 different Bridgestone dealers during the first couple of years the ZIP was available. One in Colorado and one in California. I think I saw 3 broken frames during that time. All of them were broken in the same spot, on the down tube just behind the head tube.
My solution was to build up a MB-1/2 by using parts spec'd on the 1990 ZIP (Specialized cold forged cranks, Dia Compe 986 brakes, etc) on my 1990 MB 1 frame. Sweet bike. Almost as light as the ZIP, but stronger.
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