Shimano GC Shimano BB-7200 GB-100 DURA ACE Bottom Bracket 68mm 116mm 35xP1 French (LN)

[woodbutchmaster]

Can anyone tell me how to remove one of these ,ie which direction clockwise or anti-clockwise ? The frame is going for a respray and l don't want to leave it in the shell.
PS l have had no luck either direction so far, it just won't budge

 

[midlife]

French bb was 68 mm with both cups having a right hand thread. Is it a really old French frame?

 

[woodbutchmaster]

French bb was 68 mm with both cups having a right hand thread. Is it a really old French frame?

Yes it is a Bernard Carré signed frame

I think probably mid 1970's. From what l have been able to find out he built it for his own business ,it wasn't to order for the Bertain factory

 

[midlife]

Blimey, nice find . I guess it's a genuine French frame from my era with a French bb which has a right hand thread for both sides. Undo both sides anti clockwise. Any pics of the BB?

 

[woodbutchmaster]

Blimey, nice find . I guess it's a genuine French frame from my era with a French bb which has a right hand thread for both sides. Undo both sides anti clockwise. Any pics of the BB?

I will take a few pics today for you , thanks for the thread info.

 

[midlife]

I guess you have checked Sheldon Brown's bottom bracket crib sheet

 

[woodbutchmaster]

I guess you have checked Sheldon Brown's bottom bracket crib sheet

No l haven't but l certainly will because although the lock ring undid easily the drive side just won't move and l dont want to damage the b/b shell if l can help it.

 

[woodbutchmaster]

Success , buoyed up by the redoubtable S-B , l finally got the drive side out ! What a very unpleasant mess of ancient , dust and grit polluted grease inside. One thing l learned from Sheldon-B is that the b/b shell faces must be trued before fitting the Shimano stuff. Unfortunately this was not done by whoever fitted the b/b , there was a very noticeable gap on one edge of the lock ring side, and the rim of the shell is a bit chewed up. I will have to do a bit of cosmetic work before it goes for respray.
A few photos before l clean it ! and a few of the frame before stripping .
If you notice on the head tube lugs there are small diamond shaped cutouts , Carré only did these on his own frames for commissions from private customers.

 

[woodbutchmaster]

Just in case you haven't come across this l thought you would find it interesting.https://bertinclassiccycles.wordpress.com/category/bernard-carre/

 

[woodbutchmaster]

Ok so it took a while to clean the worst of the grime off and it isn't perfect but you asked for a photo so here you are,

 

[rogerzilla]

Is the thread the same as an ISO LH cup? Most shop facing tools have a bush which threads into the opposite side and acts as a guide for the cutter.

 

[woodbutchmaster]

Is the thread the same as an ISO LH cup? Most shop facing tools have a bush which threads into the opposite side and acts as a guide for the cutter.

I think they are the same, bike shops and mechanics are thin on the ground here darkest Lot but l guess l could source the necessary tools and do it myself

 

[rogerzilla]

I checked. It's unique (35mm and 1mm pitch). This means bike shop facing tools probably won't work unless they have a French adaptor. The Cyclus one only comes with ISO/BSC and Italian adaptors. The Park one only comes with BSC and Italian can be bought as an accessory.

You'll need a shop that does a lot of old French bikes, or a tool that doesn't rely on the threads. Or get a machine shop or someone with a lathe to knock up a suitable bush with a 35 x 1 external metric thread and an inner diameter to match the facing tool spindle.

 

[woodbutchmaster]

Oh boy would you like to come here to France and explain to the little village garage (there is no such thing as a bike shop here) ? The garage are pretty good , if they can't find it they make it. Yes l do live in very rural SW France, oh and wine is literally cheaper than water .

 

[midlife]

If the lockring g stays locked why have it faced?