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As long the thread is the same should be the safe.
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All the cranks use a 24mm spindle so no worries there. The only thing to note for future is that Ultegra and DA cups are a smaller size. They supply them with a plastic shim but I've managed to strip 2 while fitting them so bought a proper sized wrench.
daveaa
Skydog
@Bezzin
pretty much set on buying a tiagra 4700 groupset for my winter bike. Do I need to worry about BB size etc, or can I use the one that is one there at the mo? Currently running Sora 9 speed (not the latest one) with an external BB on a Genesis Equilibrium - it's a shimano BB but I can't remember what spec...