29 November 2007

BBs: Headed back inside...

External bearing bottom brackets are a great idea. While some bikes may see a slight increase

in Q-factor, the design's simplicity, increase in stiffness, bearing size and decrease in weight are huge advantages. Now, companies such as Trek, Pivot and Ibis are taking the idea one step further and integrating the oversized bearings into an integrated headset-style system. While we haven't seen an official name or standard (a la ISIS), we're big fans of the idea. 90mm BB shells allow for more flexibility in BB configuration as well as greater weld area for chainstays, down tubes and seat tubes. As a bonus, Trek figure that the configuration saves about 40g.

Today, we see that Travis Brown's 69'er has a beautifully-executed version. We'd imagine that we'll be seeing more and more of this design over the next couple of years...

bikemagic.com
trekbikes.com
pivotcycles.com

1 comment:

Matt said...

Prolly a good idea. It was only a matter of time before Chris King came out with a super cool looking anodized external BB that everone just had to have. Seriously though on these new carbon frames from the big companies it just makes sense, along with the integrated headset.

But square taper still works for me....that and a King Headset! ;-)