Mark, On a non Rivendell bike that I had those cranks on I used a 122.5 BB. I could have went a little shorter had the chainstays been dimpled for crankrings. It was that inner bolt on the 36 chainring that caused much of the problem as the head sticks out past the chainring. I came up with 122.5 by eying the crank on the BB spindle that I had, placed it where I needed it, measured the distance, doubled it, added this number to the my current BB and came up with 121. Shimano had a 122.5 which was only .75mm off from my best guess so I used it. Hope it works out for you.
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