Crankset and bottom bracket compatibility

roof30
roof30 Posts: 48

I have just bought myself a 48/38/28 Shimano Tourney X crankset to replace the original Sugino on my Spesh Sirrus - an almost like for like replacement. The bottom bracket I was recommended was the Shimano UN-300 68-113mm (also purchased). Having looked at the spec of the Tourney crankset on the Shimano website it recommends that the BB specs should be 68-122 or 68-123. Is using the 68-113 going to make much of a difference, or should I return it and get the UN-300 68-122 or 123?

I understand that the 68 is the length of the BB, but not certain what the 113, 122 or 123 relate to. Can anyone help.

Cheers

Cannondale Synapse AL 105, Specialized Sirrus Comp

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