I want to do the following but I'm afraid I'll mess something up. Can anyone let me know the dangers of doing this?
1. I currently have a triple crank, and DA Triple brifter, (9sp rear). (I'm unsure about the bb width)
2. I want to put a double crank on the bike, and keep the same brifter/derailleur, but use the limit screws to prevent shifting off the inner chainring.
My questions: Is there anything preventing the use of the longer triple BB with a double crank or do I need to replace the BB? All the triple to double threads say you need a new BB. Is that really a NEED or a "will be better with." Will I be okay with the triple shifter or do I need to get a double shifter?
I only want to do this on a temporary basis to give the double the old college try. If I really like the double setup I may spring for the other stuff, but just to give it a go I'd prefer not to. Also, changing cranks is one thing, I'm not sure I'm ready to mess with the bottom bracket, so I don't really want to change it unless I risk damage to the bike by not doing so. Thanks for the advice.