Singlespeed & Fixed Gear - Lets talk about eccentric bottom brackets...
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02-28-09, 04:36 AM
I fail at the search function because I know this has been discussed before. I'm 95% sure that someone makes an eccentric BB that fits inside a standard BB shell. Does such a product exist? Any info that someone wants to share would be much appreciated.
FWIW.. I hope to be purchasing a 7 speed IGH wheel soon and although I may wedge it into my FG frame, I think a better long term solution may be a new frame with correct rear spacing. Since road frames with vertical dropouts are cheap and readily available I'm thinking eccentric bb may be the way to go.
(I know that IGH's are not FG or SS but since there is only one chainring and one cog I felt this would be the best place to ask.)
02-28-09, 04:59 AM
you might be interested to this (http://forwardcomponents.blogspot.com/2008/12/eccentric-bottom-bracket-patent.html).
or this (http://www.trickstuff.de/index.php?p=d116en1).
02-28-09, 09:53 AM
If you're not going to use a coaster brake a $20 tensioner would work.
02-28-09, 10:09 AM
"I think a better long term solution may be a new frame with correct rear spacing."
Road frames with horizontal dropouts are also cheap and readily available.
02-28-09, 11:50 AM
Sure, there are plenty of older road frames with horizontal dropouts; if you are lucky to find one in your size and of the quality you're interested in. If the OP wants to go new, there's the Surly Cross Check, Salsa Casseroll and probably a couple others I can't think of right now. Both of those are fine frames, but not AS cheap or available as frames with vertical drops.
What is the spacing of the hub you're interested in? If it's 130mm or less, you'll be fine squeezing it into the 120mm spaced rear end of your fixed frame (or cold setting if it's steel) but then you'd only have one bike when you could have two!
Those EBBs look neat, I wonder how the hold up over time. The downside, I guess, is you're limited by what cranks you can use.
02-28-09, 01:23 PM
Thanks for all the replies.
I'm in the process of shoehorning the 132-ish mm SRAM 7 speed hub into my 120mm rear spaced Motobecane Messenger but as mentioned- now I'll have a 7 speed IGH bike but no fixed gear. I will keep my eyes open for a decent price on an oler road frame but most of what I see around here are (a) to small for me @ 6'2" or (b) heavy-framed low end bikes that are overpriced for what they are. (Not all 70's schwinns are worth $500+ as the local craiglsisters seem to believe)
I got a killer deal on this new wheel- a wheel built by my LBS with the SRAM 7 speed IGH, and a Ritchey rim complete with the shifter/cable/everything needed for $80. The hub alone (no shifter, not built into a rim, etc.) sells for $244 @ Harris Cyclery. It's going to be awesome.
02-28-09, 06:44 PM
post it here when you're done. if you're using old road frame, why not using chain tensioner instead?
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