BB and crankset change

Etmiller11 · 06-17-2011, 06:50 AM

I have a old murray eliminator that I want to change the 1 pc crankset to a 3 pc, 1 can that be done an 2 what size would BB be if I had to get new one for crankset and spindle.

nfmisso · 06-17-2011, 11:34 AM

yes; and it depends on the crank set you choose and the width of your frame.

This one uses cone style bearings - which are included: http://www.amazon.com/Pyramid-Piece-Bottom-Bracket-Conversion/dp/B000AO9O12/

These require a separate BB:
http://www.amazon.com/BB-Conversion-Cups-Action-American-euro/dp/B003Y81FUO/
http://www.amazon.com/SBS-Aluminum-Bottom-Bracket-Conversion/dp/B000C1251E/
http://www.amazon.com/BB-Conversion-Bp-American-To-Euro/dp/B001G8TSPS/

Bill · 06-18-2011, 09:59 AM

Hey Nigel I noticed the above (1st link you put ) is 130mm?

nfmisso · 06-18-2011, 12:43 PM

Hi Bill;

I had not noticed that......

From the appearance of it, the axle could probably be replaced with one of the many others Pyramid catalogues.

Etmiller11 · 06-18-2011, 05:24 PM

Would my murray have an american bb or mid?

nfmisso · 06-18-2011, 06:09 PM

(06-18-2011, 05:24 PM)Etmiller11 Wrote: Would my murray have an american bb or mid?

1 pc are generally called American. Have not heard of "mid" before. Where did you see that term?

I'd go with the SBS conversion. You still have to pick a BB, which will depend on the crankset you choose.

If you pick the Pyramid kit, you may have to change the axle depending on the crankset you choose.