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Raleigh Campagnolo Bottom Bracket length?

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Raleigh Campagnolo Bottom Bracket length?

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Old 11-29-09, 08:23 AM
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sciencemonster
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Raleigh Campagnolo Bottom Bracket length?

I've upgraded the 68mm bottom bracket on my '68 Competition with a 2008 cranket by flipping the spindle around, as suggested by Sheldon Brown, but it's still not lined up perfectly. The new matching bottom brackets come in 102mm, and seem to be pretty common (ie cheap)

Is that the right size? It says right on the box, for 68mm BBs. Or is there some other trick to this?
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Old 11-29-09, 08:35 AM
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the length of your BB spindle is determined by the crankset you are using. while we all like to mix and match things and save money doing that sometimes means compromising on a chainline not being perfect.

modern cranksets do not have as much dish (if you will) as older cranks so just flipping the older longer spindle will not solve the issue. also the taper is likely different cna could be causing the new crank to not go one as far as it should or maybe even too far.
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Old 11-29-09, 09:04 AM
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That's a Stronglight spindle in it, correct? If so, it's ISO, and will also be incompatible with your newer crankset (which is most likely JIS).

-Kurt
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Old 11-29-09, 09:17 AM
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That's what i'm getting at - it's a 2008 Crankset, the new BBs are 102, so it should fit. Shouldn't much matter about my bike, right?
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Old 11-29-09, 09:18 AM
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I guess what I am looking for is someone who's put one of these on a regular old steel frame, and found it to work/not work.

Changing a BB is an ordeal, so although normally I would just try it, but I'd have to take it to a shop to get the old fixed cup removed, and then buy the special tool for the campy BB.

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Old 11-29-09, 09:42 AM
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Originally Posted by sciencemonster View Post
That's what i'm getting at - it's a 2008 Crankset, the new BBs are 102, so it should fit. Shouldn't much matter about my bike, right?
Well, it depends. What is the width of your original spindle? It's offset? More importantly, the width from the offset center of the spindle to the extremity of the left crank taper.

What taper is the new crankset? Is your new crankset sitting too far inboard or outboard?

There are a couple of factors that I see in your example that have the potential to affect the chainline:

1. JIS taper crankset on ISO spindle - the crankset will invariably sit on the spindle deeper then it should (and potentially wreck the crankset taper)
2. A new 102mm spindle is most likely equal in length on either side; the original probably isn't. Measuring the original won't give you an accurate representation of the overall width in comparison to the new one - you'll have to measure the left side only, up to the centerpoint of the frame. Compare that with the 102mm measurement of the new spindle, divided by two.

-Kurt
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Old 11-29-09, 09:56 AM
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The crankset/proposed new bottom bracket are the 10-speed Campy Chorus models. The old spindle I believe is 115 - it's the same stock size on every old raleigh I've seen. Since the Chorus stuff is matched, I must assume the taper is compatible (on the new set.) On the old one, it doesn't seem to stick out too far - it's maybe 1/8 inch out, but I have the spindle reversed. The nondrive side is out 3/8 or so. The crankset seems to have some kind of bulbous plastic ring on it that spaces the crankset out far.

I should clarify - I'm not too concerned with chain line as the engine on my bike is not exactly the high performance model, if you get my drift. I would just like to try working on one of these new fangled bottom brackets. I'm doing a preflight check, so to speak, before I pop for the BB and tool. They some in other sizes, but 102 seems to be the most common.

I just assume that all old Raleighs take the same size...not true?
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Old 11-29-09, 10:06 AM
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Originally Posted by sciencemonster View Post
On the old one, it doesn't seem to stick out too far - it's maybe 1/8 inch out, but I have the spindle reversed.
That's to say that the crankset is sitting 1/8" farther outboard then it should? Shouldn't be much of an issue, unless your front derailer is finicky to chainline.

Originally Posted by sciencemonster View Post
The crankset seems to have some kind of bulbous plastic ring on it that spaces the crankset out far.
Have a photo of that bit?

Originally Posted by sciencemonster View Post
I just assume that all old Raleighs take the same size...not true?
Same size - do you mean the same BB spindle width?

My main worry is that your crankset is close to bottoming out - if it hasn't already - on the existing ISO spindle. I'd take the chainring bolts off and examine how much of a "step" is left between the flat of the crankset and the end of the spindle.

-Kurt
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Old 11-29-09, 10:30 AM
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Yes, my worry is the mismatch between new campy and old spindle taper. I'd hate to ruin the crank.

The 1/8 is distance from the BB flat - see pic.





Hmmmm...not quite sure how to get a decent sized pic up. Try this link:

http://www.sciencemonster.net/ebay/bb.jpg
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Old 11-29-09, 11:25 AM
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That looks quite good, as a matter of fact - I wouldn't worry about the chainline at this point, as opposed to the spindle taper.

-Kurt
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Old 11-29-09, 11:32 AM
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It seems to me that you are making this more complicated than it needs to be. Just buy the correct cartridge bottom bracket for your new crank and screw it in there.

If you can't manage to get the fixed cup out by yourself, pay to have it done.

There is no mismatch of tapers the way you have it set up now.. They're all 2 degrees.

It's not rocket science.
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Old 11-29-09, 12:28 PM
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As Bianchigirl mentioned, it depends on what crankset you are using.
Most "classic" double cranksets will work with up to 113mm spindle legnths, but if you have a classic Stronglight crank, you might have to go with a slightly longer 118mm ISO taper spindle. Not surprisingly, Stronglight seems to like to occupy areas where other brands don't so they use this 118mm legnth for their doulbe cranks, when other brand will use such legnths with their triples........blehhh........French.....

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Old 11-29-09, 12:42 PM
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He stated that he has a 2008 crank, so your advice isn't much help, is it?
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Old 11-29-09, 02:18 PM
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no
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Old 11-29-09, 02:41 PM
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I agree with dirtdrop just get a nice new cartridge BB.

also before the Pedants and other English Majors catch up with you you upgrades your crankset. ( the thingies that the pedals attach to) you overhauled your bottom bracket
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Old 11-30-09, 10:49 PM
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Well, not that you can search anymore - it took me almost 2 and a half years to find this thread again - but if you _could_ search, and you are looking for help with modernizing your BB, here is my answer:

Yes, when you have an old bike such as a Raleigh, and you upgrade to new square taper Campagnolo cranks, the 102mm bottom bracket IS the one to use, even though it's a 13mm shorter than the stock 115mm one. There is an inset on both sides of the BB that those clunky yellowed white plastic things sink into, and it fits. Tight as can be, but the clearances are there. Dirtdrop wins a cookie! Although, I must say, the bottom brackets seems to come in other lengths besides 102, so I was nervous. Also, in case anyone is interested, you don't need a fancy expensive tool to take the fixed cup off - I just bolted a little flat stock on to hold the english wrench on tight and it screwed right off, with a little leg leverage. You do, of course, have to remember after 15 minutes of trying to unscrew it, that it has backwards threads.



http://www.sciencemonster.net/ebay/bb2.jpg <--full size
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Old 11-30-09, 10:56 PM
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Oh, yea, also, the BB didn't come with a lock nut, so the threads stickout a little - Should put the old lock nut back on...or am I supposed tighten the crap out of that until the threads are flush?
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