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conversion complete 9 to 10 spd

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conversion complete 9 to 10 spd

Old 05-14-13, 06:31 PM
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conversion complete 9 to 10 spd

I post this as an FYI since many ask the question about needing to face bottom brackets. My wife's Trek 2000 alpha sl had an 9 spd triple with isis square taper BB/spline BB. I got a good deal on a Shimano Hollowtech II tiagra compact with 165 mm cranks she is short. Took a huge amount of force to get the cranks pulled after many years but the BB came out pretty easy. I put the new cups in and crank testing the ease of spinning, no issues. I would say the crank simply spun free at least 3-4 times with no binding or force. Maybe I am lucky but sure seems like unless things are off you can usually make the conversion and not face the BB. I sure like the external BB they have been easy for me in the past and are easy to take care of. Seems they are going to be a thing of the past but hopefully they will be around.

In any case I had set of 105 double brifters laying around and a spare 10 speed cassette and the bike now just shifts almost as good as my Ultegra's 6600 little difference in the end. I was glad to get rid of the triple up front she is not much for all the trimming that the old set up was requiring. In the end it was a great project for a home mechanic to rely on yourself and help here when needed. I am not sure what the shop labor would be to do this not counting the parts but I just love doing this type of stuff. I had to buy a crank puller and a bottom bracket tool to remove the old crank but now I have them for the future. I slowly have built up some bike specific tools and that seems to be the best way rather than kits. I repair guitars so I have lots of tools and love a good tool they are so nice. Now we have to get out and ride together she likes to ride and gives me a chance to slow down and now worry if I am averaging xxxx MPH all the time.

Moral for me is maybe I am lucky on BB and not needing facing but try it before you get it faced.
Buy tools as you need them then you only have what you need and many tools are not bike specific so you have lots of choices
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Old 05-14-13, 06:44 PM
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Originally Posted by deacon mark
My wife's Trek 2000 alpha sl had an 9 spd triple with isis square taper BB/spline BB.
Nit-pick warning: ISIS and square taper bottom brackets aren't the same thing.

I'm glad the Hollowtech II installation went well. You used the same criteria I do for external bearing bb's, if the spindle slips through both bearings without requiring force to align it, the bb shell is parallel enough.
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Old 05-14-13, 07:39 PM
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Correct I type too fast and square taper was wrong.
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