BB size for Shimano Chainset
The octalink BB that its replacing has a 68mm shell, 1.37 x 24 thread & pitch, and 113mm spindle. Thanks guys its appreciated
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Any standard Shimano square taper bb with 68mm x 113mm spindle length to match the length of the original Octalink's spindle would be a suitable replacement.
The 1.37 x 24 thread and pitch is a common, standard English thread or BSA threaded shell measurement and the replacement square taper bb will have the same numbers printed on it.
Nothing online because it's not a 'one size fits all' spindle length as it depends on the bike it's been fitted to for chainring clearance from chainstays which obviously varies between bikes.0 -
@ reaperactual , the depth and range of your bike tech knowledge continues to astound me.
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Thanks fro the reply. Im a bit confused with this, I took my old bb into the shop and asked if it could be replaced with a square taper for a different chainset; the response was that the spindle length would be determined by the chainset. Therefore I did not purchase anything as I was not sure what the chainset required (i.e spindle length). Hence the question, now im even more confused. How will i find out what size BB I need then ?? Thanks guys/galsreaperactual said:Any standard Shimano square taper bb with 68mm x 113mm spindle length to match the length of the original Octalink's spindle would be a suitable replacement.
The 1.37 x 24 thread and pitch is a common, standard English thread or BSA threaded shell measurement and the replacement square taper bb will have the same numbers printed on it.
Nothing online because it's not a 'one size fits all' spindle length as it depends on the bike it's been fitted to for chainring clearance from chainstays which obviously varies between bikes.1 -
Now I have looked up your FC M610 crankset I see why you are confused. Your newly acquired used crankset is a Hollowtech II two piece crankset.
The FC M610 therefore needs a Shimano Hollowtech II external bottom bracket and not a square taper bb.
You will require a Shimano HollowTech II bottom bracket for an English threaded 68/73mm shell.
For fitting to your 68mm frame shell width you need to fit the supplied 1.7mm and 0.8mm spacer to the driveside and the 2.5mm spacer to the non driveside of the frame shell (between the screw on cups and frame).
There will be full instructions (included) for fitting with the new Hollowtech bottom bracket. Sorry for the confusion, hope this clears things up.👍
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Take it back Steve. Good info but totally wrong! 😭🤣😂steve_sordy said:@ reaperactual , the depth and range of your bike tech knowldege continents to astound me.
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No its definitely a square taper, the holes in the centre of the chainset are square. This is an old set not the most recent offering, and definately has FC M610 stamped on the inside of the crank arm !reaperactual said:Now I have looked up your FC M610 crankset I see why you are confused. Your newly acquired used crankset is a Hollowtech II two piece crankset.
The FC M610 therefore needs a Shimano Hollowtech II external bottom bracket and not a square taper bb.
You will require a Shimano HollowTech II bottom bracket for an English threaded 68/73mm shell.
For fitting to your 68mm frame shell width you need to fit the supplied 1.7mm and 0.8mm spacer to the driveside and the 2.5mm spacer to the non driveside of the frame shell (between the screw on cups and frame).
There will be full instructions (included) for fitting with the new Hollowtech bottom bracket. Sorry for the confusion, hope this clears things up.👍0 -
Put some pictures on jimspike200!
If it's square taper go back to my original answer, forget what the shop said and buy a Shimano square taper 68 x113 bottom bracket.0 -
Thanksreaperactual said:Put some pictures on jimspike200!
If it's square taper go back to my original answer, forget what the shop said and buy a Shimano square taper 68 x113 bottom bracket.0 -
Hmm, autotype struck again! Fixed now.reaperactual said:
Take it back Steve. Good info but totally wrong! 😭🤣😂steve_sordy said:@ reaperactual , the depth and range of your bike tech knowldege continents to astound me.
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