RobertWhitehead Posted September 29, 2021 Share I was wondering recently: does one get different BB sizes for road bikes as commonly as for mountain bikes as well? Like is something like a BB30 available in all the Shimano ranges for road bikes or does the BB30 only come on certain models. Link to comment Share on other sites More sharing options...
GaryvdM Posted September 29, 2021 Share https://wheelsmfg.com/bb-standards https://www.parktool.com/blog/repair-help/bottom-bracket-standards-and-terminology https://www.slowtwitch.com/Tech/Bottom_Bracket_Standards_2573.html When I last checked Shimano does not make a crank with a 30mm spindle, they are all 24mm. So if the bike has a Shimano crank on it, I can be 99% sure it's not BB30. It would be help us to help you if could give more detail on what you are wanting to do. Edited September 29, 2021 by GaryvdM Link to comment Share on other sites More sharing options...
Jensie Posted September 29, 2021 Share Depends on the frame manufacturer, all differs, Giant uses BB86, Merida was on BB30, Trek on BB96. That is what I know then there are the press fit and screw in ones that differs as well. I could be wrong but this is out of my head and not fact checked.... Link to comment Share on other sites More sharing options...
Eldron Posted September 29, 2021 Share BB formats are a nightmare - kinda like boy bands - there is a new one every week. There are multiple formats for both road and mtb depending on frame dimensions and crank combination. Basically you get threaded BBs and Press Fit BBs then a few widths and diameter options for each then you have to match your choice to the crank spindle diameter (and for some added fun some cranks are different diameters on each side). It's like bobbing for apples with your eyes closed and a gum guard in. Can we just agree that T47 will be the only format forever please... Edited September 29, 2021 by Eldron GaryvdM 1 Link to comment Share on other sites More sharing options...
Eddy Gordo Posted September 29, 2021 Share Please dont get started on headsets!!! But yes, there are multiple types of BB's Shimano Deore BB52 Hollowtech II can be used on a road bike and mountain bike. https://www.bikeradar.com/advice/buyers-guides/the-complete-guide-to-bottom-bracket-standards/ Eldron 1 Link to comment Share on other sites More sharing options...
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