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Shimano RSX upgrade questions 2

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Shimano RSX upgrade questions 2

Old 06-17-19, 11:53 AM
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Kable
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Shimano RSX upgrade questions 2

Hey, My question is: is it possible to convert an old square taper RSX bottom bracket to the new Outboard 105 style. I just want to know if it can be converted.

Thanks
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Old 06-17-19, 11:56 AM
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wgscott
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You have to get a different bottom-bracket, but the bottom-bracket shell (the part on your bike frame) is almost certainly compatible with the modern external ones, including what is used now with 105 cranks.
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Old 06-17-19, 12:09 PM
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Why? The square taper is a good design and shimano square taper bottom brackets are readily available.
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Old 06-17-19, 12:12 PM
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Originally Posted by wgscott View Post
You have to get a different bottom-bracket, but the bottom-bracket shell (the part on your bike frame) is almost certainly compatible with the modern external ones, including what is used now with 105 cranks.
That's awesome, thanks. I'm planning to replace the entire system so a new bottom bracket won't be a problem.
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Old 06-17-19, 12:14 PM
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Originally Posted by bikemig View Post
Why? The square taper is a good design and shimano square taper bottom brackets are readily available.
Because I want to change the entire groupset. The one on the bike is really old but I love the frame so I'm upgrading everything.
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Old 06-17-19, 12:31 PM
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I changed one with square taper to external BB, and one with external BB to square taper.
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Old 06-17-19, 12:35 PM
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Originally Posted by Kable View Post
Hey, My question is: is it possible to convert an old square taper RSX bottom bracket to the new Outboard 105 style. I just want to know if it can be converted.

Thanks
1- yes it can be easily converted. Its just a matter of unscrewing the old BB, cleaning the threads and shell, then installing the new BB system. The bike uses a 68mm BB shell which is the same as whats used now.
2- you mention that you are fine converting everything, but a question like this causes me to guess that this will be a first for you. Thats awesome to see as its a fun hobby(building up old frames), but you really need to make sure you are aware of any possible limitations/issues ahead of time. Just read up on Sheldon's website and watch some videos if needed. Tools to maintain a full RSX bike will be in part different from tools to maintain a full modern 105 group.
3- change the brake calipers as new calipers are designed to pull with current 105 levers.
4- post here or in the C&V forum if you have questions, but there is no need to start multiple threads to ask basically the same question. Heck, just keep 1 thread going and ask any questions you have in it. the C&V posters are more than happy to share info and help. https://www.bikeforums.net/classic-vintage/
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