What's the difference between the 105 BB and a deore BB ?
Latter come with spacer to fit between BB and shell to allow an MTB chainset to fit on 68mm shell.
If you’re running a road hollowtech BB; go for whichever the cheapest.
The threaded part is slightly longer than the road version to accommodate the spacer.
It's more a case of: do I buy the BB now or wait to see what whichever shop I take to do the cabling and new chain decides to do
It's getting the "go to shop with wheels on, point out what needs doing" service.
@Chalfie started
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Latter come with spacer to fit between BB and shell to allow an MTB chainset to fit on 68mm shell.
If you’re running a road hollowtech BB; go for whichever the cheapest.
The threaded part is slightly longer than the road version to accommodate the spacer.