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Are the bottom brackets for DA 7800 and the R700 compact cranks compatible with one another? is the only difference the R700 is the ultegra model so is a bit heavier? Could I simply leave one bottom bracket in there (the DA one), and swap out the cranks as needed, with the only adjustment needed being FD height?
 

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buddhistwithafancybicycle said:
Are the bottom brackets for DA 7800 and the R700 compact cranks compatible with one another? is the only difference the R700 is the ultegra model so is a bit heavier? Could I simply leave one bottom bracket in there (the DA one), and swap out the cranks as needed, with the only adjustment needed being FD height?
They are indeed the same. The only concern you have now is removing links from your chain as it will be too long.
 
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