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Swiss thread cartridge bottom bracket(9 posts)

Swiss thread cartridge bottom bracketRoundabout
Sep 14, 2003 5:59 PM
Anyone know where I can get a reasonably priced "Swiss" threaded cartridge type bottom bracket with a tapered axle? I am rehabbing my old Motobecane and would like to replace the worn old cup and cone BB with a modern cartridge and do not want to spend more than the bike is worth on this one part. Phil Wood makes one, but $150 is way over the budget. The low end Shimanos that I have seen are all "English" threaded.

The threading is 35x1 tpi. The axle is 124.5mm tapered.

This stuff is so old I am surprised that anyone makes it.
Could you...Atombomber
Sep 14, 2003 7:08 PM
Re cut the threads with for an Italian BB? They are 36x1, so there is some extra meat, but I don't know it is enough though or even possible. Maybe some of the really knowledgeable folk have an idea.
Swiss thread or French?Straightblock
Sep 15, 2003 8:56 AM
Double-check it. An old Motobecane should be French. I think the Swiss thread is the same but with opposite threading on one of the cups. Check sheldonbrown.com, there should be better info there, plus the Harris Cyclery page there has a Stronglight French BB for $50.
Definitely Swiss - Fixed cup is left hand threading (nm)Roundabout
Sep 15, 2003 10:03 AM
The bike's not worth it, but tap it out to Italian (36x1) (nm)Kerry Irons
Sep 15, 2003 4:45 PM
re: Swiss thread cartridge bottom bracketale-x-x
Sep 16, 2003 11:01 AM
several options:
Its defintely swiss threaded btw. I worked on a very similar bike a few months back. You can scour ebay for swiss cups (they appear with decent frequency); you could find a Mavic, non-threaded b/b, or; you could buy the Phil cups and use the bb from a shimano UN-72 bb (the cups are removable revealing a bb body almost identical to the Phil bb). On the bike I was building, I ended up doing the latter...the Phil rings and the UN-72 bb.....worked great. Let me know if you need any further assistance
re: Swiss thread cartridge bottom bracketRoundabout
Sep 16, 2003 6:52 PM
Great suggestions. Thanks.

I didn't think Mavic still made the threadless bottom bracket. I found one on the Internet for $89 bucks. Pricey. They show up on Ebay too. In my search I also found instructions which make installation look difficult (special facing and reaming tools needed). I do not have the tools.

The Phil/Shimano approach sounds very promising. Ironically, the Phil cups cost more than the Shimano BB. Do you need a special tool to install the Phil cups or can you use a Shimano type? Is it possible to use the existing cups to hold in the Shimano cartridge?
re: Swiss thread cartridge bottom bracketale-x-x
Sep 17, 2003 10:24 AM
You are correct, Mavic no longer makes the bb. I thin 2 appeared on ebay this morning. As far as the facing etc goes, i have never gone tot hose lengths. The bb has 2 adj rings on either side---each ring has a beveled edge that seats itself into the bb shell. I have had no problem getting these to seat and function perfectly w/o the machining effort that Mavic wants you to go through. I have had a theory that they want you to burr up your frame so that hopefully the bb will seat better and secondly so that you'll never be able to use another bb. With the Phil, you would have to buy the 14.00 install tool (or there is one running now on ebay item #3627337000). I think the bottom line is that the swiss threading is going to cost you a premium either in labor, tools parts or some combo thereof. I'm going to check with another list and see if I can find a cheaper swiss threaded bb....I'm alexfr99@yahoo.com drop me your address and i'll let you know what i find.
re: Swiss thread cartridge bottom bracketale-x-x
Sep 17, 2003 10:46 AM
reread your original message.....I am doubtful you'll find a true modern sealed swiss bb. The closest you'll come is my shimano phil hybrid