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Old 02-10-12, 06:43 AM   #1
Smokinbbl
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Sora to 105 5700 bottom bracket

I am upgrading my group set from Sora to 105 5700. I already have a sora crank with what I assume is a sora bottom bracket. I am about to purchase and install the 105 5700 crank, and I want to know if I should replace the bottom bracket to maybe dura ace for $33 or just leave the one already installed in there? The bike was bought new in 2010, so I know there is nothing wrong with it.

What do you think?

Thanks,

Jimmy
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Old 02-10-12, 07:34 AM   #2
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i would leave the stock bb and ride it til it dies
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Old 02-10-12, 07:54 AM   #3
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Personally if I were doing this upgrade I would spend the $20 and get a 105 BB, but that's just me.
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Old 02-10-12, 07:39 PM   #4
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Thanks for the responses, I was just wondering if the differences would be noticeable? If I get one I will get the dura ace for $33
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Old 02-11-12, 02:43 AM   #5
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What are you plans for the Sora crank? If you are planning to sell it, the Sora BB included would make it more desirable. Adjust your price accordingly and put it towards a 105 BB.
If there are no such plans, then I'd just run the Sora BB til it needs to be replaced. I don't think you'll notice significant differences. Bearing longevity and lighter/stronger cups is what you may get with the high end BBs. Don't forget the BB is a very low RPM interface. There will be no increase in efficiency due to reduced bearing friction here. That's just marketing science.
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Old 02-11-12, 07:28 PM   #6
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Thanks WNG, that's good advice, I do want to sell the old group set, and I didn't think about selling the BB with it.
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Old 02-11-12, 07:57 PM   #7
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I'm highly doubtful you'd notice the difference, or that someone buying a Sora groupset would be expecting the bottom bracket to come with it.

The only reason I'd change is if the 105 crank required a different spindle length.

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