|   non-bushnell EBB? | GMF
Jun 28, 2002 12:29 PM | | I'm curious about exactly how non-bushnell EBBs bind. As far as i've seen, there are 2 main styles:
1) a split BB shell that binds to the EBB a'la stem/seatpost
2) set screws that bite into the EBB a'la higher end canti straddle cable hangers (remember the Avid Tri-Aligns?)
In particular, i am wondering about #1... It seem that vulture cycles only splits the bottom bracket about a 1/3 of the way on either side, so there is a continuous strip of BB shell in the middle. Is this common practice, or just his way of doing it? Does anyone have on that is split all the way across?
Thanks,
-GMF |
| The pinch bolt (split) shell is the tradtional design | shiggy
Jun 28, 2002 1:09 PM | | There is no need for the split to go clear across the shell for the same reason a seat tube is not split the full length of the post. It is not necessary and would be weaker.
It holds just fine and is my favored design for steel frames. |
| plus | General Coonskins
Jun 28, 2002 1:32 PM | | the outside 1/2" or so on both sides of the alum EBB is the only part that touches the shell. The inside of it has been machined away, this makes it lighter and easier to clamp straight, etc..... |
| Haden | tamjam
Jun 28, 2002 1:45 PM | | The Haden Rick Hunter put on mine is split the whole way across. I actually don't understand how the shell would tighten around the EBB if it weren't split the whole way across. Or, maybe it's your question I don't understand. |
| Haden | GMF
Jun 28, 2002 2:15 PM | | Thanks Tamjam... you addressed the meat of my question about how well the shell would tighten if not split all the way across.
I'm slowly gathering the supplies needed to build my own frame and have purchased a "Problem Solvers" EBB/shell. The problem is that it seems to have a fairly loose fit, so i'm not quite sure how well a semi-split shell would take up all the slack.
I'd probably have to agree with shiggy about the semi-split being stronger, but it is good to see yours going strong, so it is obviously beefy enough.
thanks,
-GMF |
| Follow up... | tamjam
Jun 28, 2002 2:35 PM | | Thinking more about split vs. partial split, one benefit I see to the full split is it can make it easier to spin the EBB when adjusting tension and also make it easier to remove if necessary. The situation that comes to mind is if the EBB were to ever sieze up in the shell, like a stuck seatpost can become, all I need to do is stick a couple pennies in each of those pinch-bolt gaps, reverse the bolts, and loosen the shell an extra mm or two. I don't think I could do that with a partially split shell. Either way is fine I'm sure, I just prefer the full split myself.
Brian |
| If you read 'Skin's post... | shiggy
Jun 28, 2002 3:45 PM | | ...the Co-Motion EBB is machined out part way in the middle so there are rings at each end. The EBB only contacts the shell at the outer 1/2-inch or so. There is no binding at the middle. It is easy to adjust and clamps plenty tight enough. |
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