I sometimes commute on an 18" MB-5 (my fendered rain bike) and also
have a 19" MB-3 or -4 frame (its battered and no longer has the model
number; I bought it as a spare). The head tubes are identical, but the
actual top tube has less slope on the larger frame and is a cm longer.
The canonical sizing back in 1992 would have you on the 18". (At least
at the Bridgestone shop where I worked at that time.) Remember that
stems on those bikes were fairly flat and long: 7 cm was considered
short and most were in the 9 to 12 cm range.
The cheaper MB-6 was built with a little shorter t-t dimension, I
think with the assumption that the rider would be less aggressive and
more casual and upright.

David Lipsky
Berkeley

On Jan 23, 2:45 pm, tlawnsby <tlawn...@clearwire.net> wrote:
> Hi,
>
> Just curious if anyone has a Bridgestone mountain bike and how much
> shorter the size is vs your road bike.
>
> I had a new Bridgestone MB in the early 90's and loved it, but can't
> remember the size. There's another one on craigslist that I have an
> opportunity to purchase.
>
> My PBH is 82 -- I normally ride a 21" (53cm) regular road bike, and I
> have a 56cm Rambouillet which is perfect.
>
> The MB-4 for sale is  a 19" c-t -- I can try it out later this week
> but it's kind of a long drive, hate to waste the time if there's no
> chance of it fitting.
>
> Thanks, Tom.

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