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Been searching, not finding a definitive answer. 87 Sirrus, what replacement BB??

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Been searching, not finding a definitive answer. 87 Sirrus, what replacement BB??

Old 12-03-13, 01:19 PM
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Vansmack
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Been searching, not finding a definitive answer. 87 Sirrus, what replacement BB??

I have a 1987 Specialized Sirrus which I bought new then and put thousands and of miles on it, then. It has been sitting in my yard for at least 15 years, probably closer to 20. Everything is seemingly operational but it obviously needs to be fully tuned up. I replaced the tires and tubes, rim tape, repacked the hubs, they looked great, brake pads, cables and housings, tightened and trued the wheels, so far so good. Both stock derailleurs work perfect, shifts perfect. I did a couple quick rides of about 60 miles total or so and it still rides really nice. Last night I got a new BB puller as my old one was missing the part that screws onto the crank which is why I had not done this yet, it's shot, the spindle and the cups are badly pitted. The bike originally came with a complete 105 group, the original BB was replaced about six months after purchase with a Dura Ace BB-7400, the original 105 went bad. So what to replace it with? I have been searching here, VeloBase, the Internet, I could not get a definite answer to what type of taper I need to use. Some say that it's ISO, some say JIS, some say it doesn't matter, Shimano's design of the cranks then would work for both. So I'm looking at something like a UN55 (JIS) in 113mm, stock was 112mm. Any idea, will this work properly?

Not really interested in replacing the BB and the entire crankset, as it will be a weekend bike I'm looking to get it running properly on a budget if I can. Even in it's current condition I could keep up with my buddy on his Cannondale Synapse Carbon Ultegra so I don't need fancy. A few grand on a bike is in my very distant future, if ever.

Thanks for any advice and wisdom sharing!

Chris
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Old 12-03-13, 01:59 PM
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Chombi
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Any JIS tapered, English threaded, 113mm spindle length BB should work, There should be lots of them at eBay to choose from.....Why not just find a DA7400 BB and be done with it? If you want something that will surely last a very long time, invest in a Phil Wood then...
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Old 12-03-13, 02:10 PM
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Originally Posted by Chombi View Post
Any JIS tapered, English threaded, 113mm spindle length BB should work, There should be lots of them at eBay to choose from.....Why not just find a DA7400 BB and be done with it? If you want something that will surely last a very long time, invest in a Phil Wood then...
eBay is kind of empty right now for English thread options, the one complete kit says it's not functional. I have one of those.

I was looking at the Phil Wood, maybe I'll move to that depending on how much riding I end up doing. I'll probably pick up a UN55 for now.

Thanks!!

Chris
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Old 12-03-13, 03:38 PM
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Unless its major damage, I doubt it will affect the ride much if cleaned, rebuilt and regreased. But yeah, easy to find on ebay or any good bike store that been around a few decades.
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Old 12-03-13, 04:00 PM
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In the 60 or so miles of new riding I did not notice any issue with my feet, I only noticed it wasn't as smooth when hand cranking with the chain off. For the time being, I'll clean it and load it back up with grease and see what happens, that has got to be better than the condition that it was in.

Thanks all.
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Old 12-05-13, 01:23 PM
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Originally Posted by dbakl View Post
Unless its major damage, I doubt it will affect the ride much if cleaned, rebuilt and regreased. But yeah, easy to find on ebay or any good bike store that been around a few decades.
Good call, cleaned and rebuilt it feels no worse than the UN55 which will now be returned.
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