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Old 08-10-10, 10:20 AM   #1
austingoodson
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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
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Old 08-10-10, 11:48 AM   #2
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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?
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Old 08-10-10, 02:21 PM   #3
austingoodson
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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!
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Old 08-10-10, 06:24 PM   #4
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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.
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