Join Date: Mar 2008
Location: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
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You can measure your own spindle length so you get the right one. Just remove the cranks and then measure from end to end on the spindle in mm's. You can also measure the width of your BB shell to see what width of BB you need.
Most modern bikes use either a 68 or a 73 mm shell width. Spindle length varies from brand to brank of crankset.
If you upgrade to an ISIS or Octalink option the current 68 mm standard is a 113 mm spindle. So that's 68x113 for the size.
You can also measure the width of your BB shell on your Merlin just with a metric ruler or an inch ruler and convert. In this case what you see (from the outside) is what you get.
Not many bikes made in the US or sold by US brands use anything but English threaded BB's. Only your exotic Italian bikes may vary from this. And French offerings of course. But it's a Merlin and not a Motobecane....