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  1. #1
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    1978 Raleigh Rampar R-1 Bottom Bracket...PLEASE HELP!

    Hi,
    I have a 1978 Raleigh Rampar R-1 and took on the challenge of converting it into a fixed gear. This is my first build and everything has been easy so far, until now....bottom brackets and crankset/cog alignment. I have to replace my bottom bracket to fit my new Eighthinch Crankset because the spindle was "cottered."

    I have tried everything, including ordering another cotterless axle from Europe but nothing seems to work...the new spindle is too long for smooth chain alignment. So I figured the best bet is to replace the old bottom bracket with a completely new one...I'm pretty sure the BB is 68mm but I have no clue how wide the new BB needs to be...in order to save room for the lockring to screw on. If anyone can help, I would be VERY HAPPY!! Thanks!

    This is my bike model:
    http://www.jaysmarine.com/TH_Raleigh_Cat_78_12.html

  2. #2
    rebmeM roineS JanMM's Avatar
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    Quote Originally Posted by austingoodson View Post
    Hi,
    I have a 1978 Raleigh Rampar R-1 and took on the challenge of converting it into a fixed gear. This is my first build and everything has been easy so far, until now....bottom brackets and crankset/cog alignment. I have to replace my bottom bracket to fit my new Eighthinch Crankset because the spindle was "cottered."

    I have tried everything, including ordering another cotterless axle from Europe but nothing seems to work...the new spindle is too long for smooth chain alignment. So I figured the best bet is to replace the old bottom bracket with a completely new one...I'm pretty sure the BB is 68mm but I have no clue how wide the new BB needs to be...in order to save room for the lockring to screw on. If anyone can help, I would be VERY HAPPY!! Thanks!

    This is my bike model:
    http://www.jaysmarine.com/TH_Raleigh_Cat_78_12.html
    My wife had a Rampar R-1, bought new and ridden many many miles.
    The stock crankset was 3-piece square taper, not cottered.
    The bottom bracket should be 68mm. You need a 68mm BB but am not sure how long a spindle/axle you need for good chainline with a SS. Sounds like it needs to be shorter than what you bought, but how much?
    RANS V3 (steel), RANS V-Rex, RANS Screamer

  3. #3
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    My original axle has "3H" stamped on it...and sheldonbrown's website gives these dimensions for the "3H" axle:

    Size Code: 3H
    Shell Width: 68mm
    Overall Length: 113mm

    And since I'm replacing the old '3 chainring crankset' with a 'single chainring crankset', the overall length of the BB should be a little shorter, right??? Because the new single chainring is thinner, thus, it needs to be closer to the bike's frame, which means I need a shorter BB...I'm gonna get this thing one day! I wish everything concerning bike parts was standardized!
    :lease reply if you guys have any info! I'm at your mercy! Thank you!

  4. #4
    rebmeM roineS JanMM's Avatar
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    This from your crankset's website http://www.eighthinch.com/cranks.html
    107mm - 110mm JIS (Shimano, Sugino, Etc- NOT Campy) Bottom Bracket Recommended.
    RANS V3 (steel), RANS V-Rex, RANS Screamer

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