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Does this bike come with an exterior bearing? I did not think that Tiagra Components supported external bearings.....
 

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My 08 Six13 6 has Tiagra and it has the external bearing crank.
 

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wankski said:
yea, tiagra has been done over recently and looks pretty damn similar to 105 these days..
IIRC the Tiagra 4500 get the Hollowtech II billing, but the crank arms themselves are not Hollowtech. They are solid forged Al with a depression in the back-side to reduce the weight penalty. This is conveniently difficult to discern in most promotional photos.
 
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