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Post by Stella on May 9, 2014 19:00:16 GMT
When stripping the bike I didn't really look closer. It's the one with the lugged front and rear fillet brazed and I have no idea if it's a Sebring or Victor. It was light blue, a bit like the Indy. It had a cottered crank on it which I just binned. Now I was naively confident that I may be able to use the Indy's screw-in BB, but I can only screw in one side, the other won't go in, or gets really stiff after a couple of turns--a sign that it's better to stop to not damage the thread. On closer inspection I saw that this BB had been modified, my guess is that it originally came with press-fit BB, but was changed to take a srew-cup BB. Why someone would go for a cottered pin crankset is beyond me, but it resembles very much a heli coil. Here are pictures:    Any idea what I should do now? Get a 'modern' cartridge BB? Not sure what thread this BB is. English on one side and French on the other? Or Italian? I need a solution until Wednesday or my surprise will fail.  NB: Ain't this just a beautiful yellow? |
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Post by velocipete on May 9, 2014 19:24:24 GMT
It may very well be an Italian thread,that was thebest to retap a Viscount push in type.
I've recently fitted a Prestine threadless bottom bracket,as long as you tighten it up well
it seems to work really well. It was less than £11 plus postage,and you can always go back
to the original system,if you find the correct parts at a later date.
Good luck with the bike.
Cheers,
Pete.
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Post by Stella on May 9, 2014 19:26:23 GMT
Curious, isn't it? Why would someone put something INTO the BB? Well, most possibly to not destroy the shell itself and weaken it, but I've never seen something like this before.
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Post by stoatie on May 10, 2014 13:51:40 GMT
I know that Argos Racing have got a ream & sleeve option for doing bottom bracket repairs. Sheldon Brown's page on BB's might help with identifying what your current set up is. Scroll down to the table 2nd from bottom. |
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Post by Stella on May 10, 2014 15:38:48 GMT
I know that Argos Racing have got a ream & sleeve option for doing bottom bracket repairs. Sheldon Brown's page on BB's might help with identifying what your current set up is. Scroll down to the table 2nd from bottom. Cheers, Stoatie. Will definitely check this out. It's not Italian I think. I can screw in the drive side (anti clockwise) by hand, but the other one won't go into the left side. Just got another British thread cup (borrowed from someone) and it doesn't screw into any side. Admittedly I haven't tapped the threads, which will be my next first option to solve the problem. The frame is freshly from the powder coaters, so this may solve the problem. I doubt it's French threads, but one never knows where those bikes were as the Indy was in France for a while. Pah! And people say press-fit BBs are a pain ... :-) NB: the link won't work, so here's a working one for anyone interested. sheldonbrown.com/bbsize.html (is that the right one?) |
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Post by velocipete on May 10, 2014 18:44:04 GMT
Stella,the bottom bracket on my pre-war tandem,I may have mentioned it before?Had to be sleeved to put
a more modern assembly in.Tandem and solo bike bits were not so compatible in the '70's!
Can't now remember which sleeve was used,but never had any problems with it after.You may find
that it's just a bit of overspray from the coating.Last frame I had powder coated needed all the
threads chasing out afterwards.
Not the end of the world,there are several more ways of skinning this cat.
Cheers,
Pete.
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Post by Stella on May 10, 2014 20:33:07 GMT
Yes, it's the first thing to try, chasing the threads. Will try doing it on Monday. If all fails, I'll be tempted to get a threadless BB, but would hate it as they just don't look right on a Viscount. 119 or 122? What do you guys reckon? SR double and 5-speed freewheel. I seem to remember having read that the 119 is an even better fit, but might be wrong here.
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Post by velocipete on May 10, 2014 21:27:32 GMT
I put a 119 threadless in Frank using a Stronglight chainset.Actually,I could have used a 116,that would
have still left plenty of clearance twixt small ring and chain stay.If I did it again,I would take the chain set
makers bb dimension and subtract about 3mm from the drive side.Depending on the axle symetery,could be more.
Sorry can't be more specific,measurements required.
Cheers,
Pete.
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Post by Stella on May 11, 2014 9:52:09 GMT
No, no, that's fine. I was just going by the standard the Viscounts came in. That frame is a very small one and I guess that contributes to the calculation as well.
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