homebuilt help

Is it too much work to maybe sirgically remove the bottom bracket shell and
just put in a regular shell ? Maybe you can even weld a new bottom bracket
shell within the larger old shell ?

Just a thought. Hope it helps

J Gaerlan - Gaerlan Custom Cycles
http://www.gaerlan.com
Framebuilding,Recumbent and Bike Parts eStore
(415)362-3866: (415)677-8943 fax
[email hidden]

I ran across an old Le Tour 12-speed at a flea market. I was gonna use the
frame to make an SWB (ladies frame, almost like a Mixte) Anywho, it had
Sugino 170mm cranks. When I was playing crank length games on my Rotator
Tiger, I noticed these cranks fit WAY further up on the spindle than my
155mm Doteks, i.e., closer to the front derailleur (if it had one...)

I'm not using them right now. Wanna try 'em out?

Doug
Glen Allen, Va. - mere steps from the post office.

"Tom Blum" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

My newest home built has hit a snag.

You can see it here
http://mysite.verizon.net/teblum/LWB%20MARK%20II.htm

I used the large "American" bottom bracket that was on the donor frame. I
converted to a three piece crank, using an adaptor from bike parts USA.

Now, I want to change to a biopace type chainwheel, (actually Sugino

cycloid

Quoted message said:

brand) mounted to a Dotek crank, but the Q width is too great for the
derailleurs.

I know about Crupi type adaptors, but they seem to run $40 to 50, which is
kind of rich for my homebuilt style. Are there any sourced for just the
shaft of the adaptor type bottom bracket.

OR, are there cheap sourced for the Crupi type adaptors??

OR, are there alternatives I haven't thought of??

TIA
Miles of Smiles,
Tom

ps on the subject of biopace type chain rings: I was able to get the setup
to work on one chain ring. I REALLY liked the feel of it.

The literature says they are only good for a cadence of up to 90 rpm.

Since

Quoted message said:

I don't seem to love cadences over 90 (I tire and I lose power at 95 plus)

I

Quoted message said:

don't care.

Like everything else in cycling, the "best way" seems to trickle down from
the racers to mere mortals like myself.
Sheldon Brown seems to like them. That's a good recommendation in itself.
T

Doug,
Thanks for the offer, you are too kind, but that won't cure my problem.

I have the big unthreaded bottom bracket shell, like "grocery store bikes"
have. Before I can buy a narrow bottom bracket, I have to adapt the shell to
the euro type. Crupi and others make an adaptor (
http://www.danscomp.com/index.html follow links to: bike
parts/bottombrackets/conversion cups if you want to see what I'm talking
about)

My post was to see if there were other alternatives I was unaware of.

I'm getting ready to order the adaptors and be done with it.

Plus, I'm a big fan of 155 DOTEKs myself. They sure do fit tight, don't
they??

Miles of Smiles,
Tom