Originally Posted by
HillRider
Well, after complaining about the double posting, I'm still replying to this one too.
Anyway, yes, there is only one "bottom bracket" for this crank but in this case "bottom bracket" just means the external cups and bearings. It does not include the spindle which is permanantly attached to the drive side crank arm so you have no control over the chainline or crank position.
The double crank will sit slightly further inboard than the triple and you will, at a minimum, have to reset the inner and outer limit screws for your front derailleur. Your triple front derailleur may work adequately with the double or you may want to replace it with a specific double fd if the shifting isn't good enough. I'd try the existing fd first before spending the money on a new one.
Thanks,
I am planning on using a new FD, I was able to get the crank, RD & FD for under $240 on a special.
One thing that I noticed today on my ride is how the angle of my femur / hip is different, and greater on the drive side. My knee points outward more on the right than it does on the left. After my ride, I measured how far each crank arm is from the downtube. There is almost 1/2" difference, with the drive side being greater. This probably accounts for the hip / femur / knee angle, which could only lead to injuries.
Now, if I do need a new shifter, I'm looking at ~ $400 total. I might as well spend about double that (eBay ~$850) and buy an Ultegra 6700 group, and have a lighter, slightly better groupset that will save my knees & hips.
Any thoughts?