QB Bottom Bracket

[Eric Norris]

Anybody have the specs (width, offset) on the stock bottom bracket for the original production run of the Quickbeam?

--Eric N
Sent from my iPad2 

[newenglandbike]

I think mine came with a 107mm.     If you're using the QB crank though, the 32t ring is going to be real close to the chainstay.      real close.   Hasn't been a problem for me though.

[David T.]

My Quickbeam came with a 113 mm shimano BB UN-54 bottom bracket. This
was not the first run but I can’t see that it would make a difference.
With the Sugino Quickbeam crankset this gave a 48 mm chainline for the
large ring ( i.e. the middle ring of an equivalent Sugino XD. ) I
always rode in the large ring and never noticed that there was a
problem. Only after a few years did I measure. I believe the shimano
freewheel gives close to a 43 mm chainline on the Suzue rear hub.

Even if you used a common 107 mm bottom bracket with the Quickbeam
crank the large ring would still be outboard of the freewheel. I ended
up transferring the 113 mm bottom bracket to another bike ( an
atlantis that I am slowly building up as the snow slowly falls and my
neighbour incessantly shovels his driveway), and I then used a 108 mm
Phil Wood bottom Bracket with a Sugino RD crank, moved over a little
which the Phil bottom bracket allows. This gives a better chainline. I
think a 103 mm bottom bracket with a Sugino RD would be just about
perfect. But once again, I never noticed a problem in the first
place, the drivetrain was always nice and quiet.

[charlie]

I used a 107 Tange........with the Sugino crank and 39x36 rings....I
use the White 16-19 on Formula hub and get near perfect alignment
using 39x16 (66 ") or 36x19 (51"). I can cross over the combos and get
slight chain angle for 55" and 60" gearing. Using a single cog rear
you'd have to pick which ring you want perfectly aligned and choose
your BB width but I don't think its that important within reason.

[grant]

Either 107, 110, or 113 is fine. The 107 is close, but works. You'd
think the 110 might be the way to go, but the Tange 107 and 110 have
the same crank-side offset...so...hate to even bring this up because
it's a dustmites-in-the-eyelashes kind of thing, but the 110, with the
extra 3mm on the left, makes the Q more symmetrical. Three mm is
soooooo tiny. Foot placement on pedal can make up for that x4,
easily.

On Jan 28, 6:29 am, Eric Norris <campyonly...@me.com> wrote:

[Eric Norris]

Thanks, all. I have a new BB coming ... in the proper size.

--Eric N
Sent from my iPad2 

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