Long story short: I recently bought a second-hand bike (good condition), but the guy who sold it to me screwed the pedals in the wrong sides. After two months of riding, the thread on the inside of the crank arms (where it connects to the pedals) is completely stripped away, and can't hold the pedals in place. My understanding is that I have to replace my whole crankset, but I'm at a loss as to which one I should buy.
The crankset I currently have is the Shimano FC-2203, my derailleur is the Shimano FD-R443, and the bottom bracket is a Shimano BB-UN25. (Specs available online, sorry I can't link them).
I can't seem to find a Shimano FC-2203 crankset online, so I assume they are no longer produced. Am I correct in thinking I'd need to buy a new crankset with the following specs? Which are important and which are not?
Crank length of 170-175mm (the best is 170mm based on my height, but I'm currently riding a 175mm with no issue, so any number in that range should be fine).
Triple crankset for a road bike (my current chainrings are 52-42-30, so something close to that is ideal).
No more than 22 teeth diff. between top and bottom chainrings, and no less than 10 between the top and intermediate (derailleur requirements).
Compatible with my 68mm, square-tapered bottom bracket.
Compatible with an 8-speed chain and 9/16" pedals.
Chainline of 45mm (or close) to match the derailleur.
Spindle length of 113mm (or close) to match what I've currently got.
Are there any other specs I should be worried about? Let me know if more information is needed.
The cranksets I've currently found are:
Shimano Tourney 7/8 Speed TX801. This looks close, but it appears to suit a spindle length of 123mm and a chainline of 50mm. Am I right in thinking this won't fit with my current setup, and could grate against the frame?
Shimano M131. This appears to use a shorter spindle than what I have, so could that also be an issue?
Sorry about the long and confusing question, but I just want to know whether I'm on the right track to finding a replacement crankset, and what I need to look out for when buying.
Thanks so much for the help.