I posted this in the Maintenance/ Repairs section as well.
Going on long tour, many mountains.
I'm trying to put a Shimano Ultegra triple (26-39-52) on my '05 Lemond Poprad, which is currently fitted with a Shimano Ultegra double (39-53). There is just a hair's space between chainring and chainstay, so I believe I am going to need a longer bottom bracket.
Yesterday I tried measuring the axle length of the BB (Shimano octalink), and I measured somewhere around 111mm-112 mm. I think these are not actually Shimano BB sizes, so 113mm or maybe 109.5 mm and chalk it up to the inaccuracy of my measurement? I didn't actually remove the BB, just took the crank arms off and held up the ruler.
Will I be able to fit a longer BB on this bicycle in order to accommodate the triple? What are other solutions?
What about a compact? Could I put a chainring smaller than 30T on a compact and still conquer some mountains?