I purchased a Schwinn Broadway from Costco on clearance back in November, and start commuting to work (10 miles daily, decent amount of up/down hills). The bottom bracket bearing just start going out, my LBN (local bike nerd) helped me pull the bottom bracket and we found water sitting inside. I live near Seattle and we get our share of rainy days during the winter, so I think this bike as built wasn't up to the task for commuting here.
Now I want to find a sealed cartridge replacement to swap in.
The spindle looks like the illustration labeled "Japanese Bottom Bracket Spindles, Traditional Cup And Cone Type" at http://www.sheldonbrown.com/bbsize.html. With my handy dandy ruler I measure it at 125mm end-to-end, and going off of that illustration it's about a=35mm, b=53mm, c=37mm. I wouldn't bet my life on these numbers, but they're pretty close. Especially the end-to-end measurement.
It has stamped on it what looks like VP followed by 3S. That page lists a 3S overall length as 121.5, so I don't really know what to make of that. Mine is definitely longer than this.
The outer diameter of the cup things that screw into the shell measures between 34mm and 35mm, so this seems to match the british/iso thread specs I see.
So after searching around this morning I'm thinking I need to measure the bottom of the bike across the bottom bracket shell to see if it's 68mm or 73mm.
I guess my question is if I find the shell length, the threading, and I know the end-to-end length is 125mm, am I ready to order or do I need more info?
I'm not really seeing a 125mm option. It sounds like going narrower could make the chain hit something, would I be safe with something slightly longer (127mm)?
This has been a bit overwhelming to home in on, so I'm not totally confident I'm going to order something that will actually fit.
Unfortunately my LBS didn't have anything in stock.
Anything else I need to worry about?