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Shimano Bottom
Hope Technology - Shimano Bottom Bracket
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Frequently Asked Questions...
Shimano Bottom Bracket Question, I have stripped my road bike down and the bottom bracket needs replacing?
It is a Shimano Sealed Cartridge unit model BB UN 70
I dont know what the UN 70 means
it measures 113mm in total length end to end and was part of Shimanos 600 range in the mid 1990s
Please can some cycle person explain what I can replace it with a model number would be great under £30.00
Answer:
I am pretty sure that the only measurement that matters when replacing it is the 113mm......As long as you get that right, it should be okay! Otherwise you would need a new crankset that matches it! If you are replacing your crankset as well, then just buy the crankset and bottom bracket that match.

























































































