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BBS15 and BBS18

Old 07-13-19, 04:36 AM
  #1  
TheChief
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BBS15 and BBS18

I am having a new frame built, my old Trek 710 is just too tall for after some 37 years, and I need some help understanding the bottom bracket specs. There was no problem with my old Campy NR bottom brackets I just used the English bottom bracket for the Trek and the Italian for the Zullo (which was way too tall when I bought it!) I am looking at these new cartridge bottom brackets and I keep seeing BBS15 on some and BBS18 on others. What is a BBS15/BBS18 and what is the difference between the two? Thank you in advance for your kind courtesies in helping me with this.

Last edited by TheChief; 07-13-19 at 04:49 AM.
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Old 07-13-19, 05:24 AM
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If you’re looking at the Sunrace products, the main difference between BBS15 and BBS18 models is the use of aluminum (15) vs steel (18). The various specs are in this pdf: http://www.sunrace.com/files/catalog...20Brackets.pdf

once you decide which one you want, you then need to know what spindle length.
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Old 07-13-19, 05:33 AM
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TheChief
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Thank you, I checked out the information on the link you provided and I see that the BBS15 and 18 are model numbers identifying material and sleeve design. Interesting that I never realized that before.
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Old 07-13-19, 06:08 AM
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I'd be looking at Shimano or Tange, maybe even SKF or Phil Wood if was having a custom frame built.
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