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Technical & Reference Section => Tech and Restoration => Topic started by: Frosty on April 02, 2006, 07:14 PM

Title: BB thread
Post by: Frosty on April 02, 2006, 07:14 PM

Can anyone tell me what size the bb thread would be on this?

(http://[img]http://www.radbmx.co.uk/archive/albums/y91/frosty_paul/mrd1.jpg)[/img]

I had bought a crupi euro bb and the alloy cups just won't take the thread?

Thanks

Paul

Title: Re: BB thread
Post by: harris on April 02, 2006, 07:24 PM

cant see nowt mate is it spanish bb im only guessing blind

Title: Re: BB thread
Post by: Frosty on April 03, 2006, 09:50 AM

It's an MRD mini

(http://www.radbmx.co.uk/archive/albums/y91/frosty_paul/mrd3.jpg)

(http://www.radbmx.co.uk/archive/albums/y91/frosty_paul/mrd1.jpg)

I tried a mountain bike isis cup and that is a 24thread but that didn't take either?

Title: Re: BB thread
Post by: Frosty on April 03, 2006, 05:09 PM

Bump please someone confirm the thread size for a euro???

Title: Re: BB thread
Post by: kdw712 on April 03, 2006, 05:45 PM

not sure what the thread size is

but Alans has the shimano UN72
http://www.alansbmx.com/product_info.php?products_id=1147

i picked up a UN73 (newer model) for £15 off ebay for my euro BB bike
or a UN53 which a bit heavier and cheaper

always give him a ring to confirm thread sizes are ok

Title: Re: BB thread
Post by: MartyC on April 03, 2006, 08:55 PM

You could try Mavic or Campg road stuff, some of the early Euro BB's had French thread sizing, different TPI and opposite threading (tighten up the opposite way).

Marty  :daumenhoch:

Title: Re: BB thread
Post by: sawzall on April 03, 2006, 08:56 PM

i have a complete euro bb bearings shaft etc from a set of sr sakae 3 piece cranks dont know if this would be any good? for £5+post threaded cup is about 35mm diam :daumenhoch:

Title: Re: BB thread
Post by: Frosty on April 03, 2006, 11:11 PM

Sawzall,

I'll give it a go. How do I pay?

PM

Thanks

Paul

Title: Re: BB thread
Post by: kdw712 on April 04, 2006, 12:09 AM

Jeez
just googled this and theres british italian french and swiss types

though reading on french and swiss are the same so are the british and italian  ???

the common one is british according to sheldon brown

http://www.sheldonbrown.com/gloss_e-f.html#euro (http://www.sheldonbrown.com/gloss_e-f.html#euro)

http://www.sheldonbrown.com/gloss_bo-z.html#british (http://www.sheldonbrown.com/gloss_bo-z.html#british)
 
so the answer is 1.375 (35mm) x 24 tpi  :D we hope ! :daumenhoch:
 

Title: Re: BB thread
Post by: Frosty on April 04, 2006, 09:51 AM

Cheers Kev,

I suspect that the isis cups are the same though and they wouldn't take to the thread. I'll have a closer inspection of the thread make sure they run true to the edge of the bb shell.

Title: Re: BB thread
Post by: Frosty on April 10, 2006, 10:53 AM

Whipped the thing down to the local shop, and reamed the threads again. It would appear the chromgot into the threads - typical because it got where I don't need and where I do want there to be chrome it is coming off :idiot2:

BB fits nice and snug now :daumenhoch:

Title: Re: BB thread
Post by: kdw712 on April 10, 2006, 10:57 AM

Glad you sorted it   :daumenhoch:

Title: Re: BB thread
Post by: Frosty on April 10, 2006, 11:06 AM

Sawzall,

The bb arrived - thanks.

Paul

Title: Re: BB thread
Post by: sawzall on April 10, 2006, 06:31 PM

 :daumenhoch: