PITFALLS CONVERTING COTTERED 2 COTTERLESS

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PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby oldschoolfool » Sun Aug 30, 2009 1:49 pm

I'm making the change from cottered cranks to cotterless but there is a plethora of options. I'd like to retain the bottom bracket bearings that i have but need the crankshaft to be compatible. :? Seeking wisdom from anyone!!
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by BNA » Sun Aug 30, 2009 2:06 pm

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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby Lark2004 » Sun Aug 30, 2009 2:06 pm

why?

Just get a new cartridge BB like this and be done with all the fiddling around.
Image

They are about $20 - $25 at your LBS.
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby hartleymartin » Sun Aug 30, 2009 11:45 pm

The $25 price tag has me somewhat relieved. I am going to have a go at a modernised roadster, and I will be going over to cotterless cranks for that project.
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby oldschoolfool » Wed Sep 02, 2009 9:59 am

Lark2004 wrote:why?

Just get a new cartridge BB like this and be done with all the fiddling around.
Image

They are about $20 - $25 at your LBS.


Very neat, cheap... best idea so far!!
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby oldschoolfool » Wed Sep 02, 2009 10:02 am

I would still like to pursue retaining stronglight bearings.
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby solocmv » Wed Oct 21, 2009 8:28 pm

Ok All,

How do you convert an old non threaded Malvern Star bb to one of these sealed bearings

Cheers
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby Lark2004 » Wed Oct 21, 2009 8:56 pm

no idea..... :?
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby hartleymartin » Thu Oct 22, 2009 8:43 am

You can get self-tightening (expanding) bottom-brackets - they are designed to fit into frames with damaged threads.

http://www.bicorp.com.au/ProductBrowse.aspx?Category=PGP154&CatDesc=B.B.+UNITS+%28CARTRIDGE%29
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby oldschoolfool » Tue Dec 21, 2010 10:54 am

Lark2004 wrote:why?

Just get a new cartridge BB like this and be done with all the fiddling around.
Image

They are about $20 - $25 at your LBS.


Just be aware that the thread length in the bottom bracket shell may not be long enough. Some fitting may be required!
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby idw » Tue Dec 21, 2010 9:09 pm

if its a one piece BB just buy one of these http://cgi.ebay.com.au/BMX-BB-Adapter-Convertor-Standard-MTB-BB-/220699885457?pt=AU_Sport_Cycling_Parts&hash=item3362bcff91
just go to your LBS or grab one of ebay. use a drift to bang out the bearing cups and BAM bobs your uncle (funny thing is my uncle is a bob)
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Prior Preparation.....

Postby Quinns Rocks Roadie » Tue Dec 21, 2010 9:16 pm

oldschoolfool wrote:I'm making the change from cottered cranks to cotterless but there is a plethora of options. I'd like to retain the bottom bracket bearings that i have but need the crankshaft to be compatible. :? Seeking wisdom from anyone!!

What kind of bike do you have now, and what is the bottom bracket shell width (frame only, not the existing cups) ?.

Eric.
Newer does not automatically mean betterer.
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Re: PITFALLS CONVERTING COTTERED 2 COTTERLESS

Postby sturmey archer » Tue Dec 21, 2010 9:35 pm

solocmv wrote:Ok All,

How do you convert an old non threaded Malvern Star bb to one of these sealed bearings


Will one of these do it ? http://www.bike-parts-plus-more.com.au/shopexd.asp?id=37344 They have a range of spindle widths listed.
1.370" x 24 tpi - what sort of stupid standard is that?
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