Update....after a 12 mi ride with no issues, the right side pedal (with LH thread) decided to unscrew itself 3 miles into the next ride, destroying the threads in the crank arm. I put the 170mm crank arms back on, kept riding and pondered my next move.
Since one crank arm was stripped out anyway I decided to see if it’s possible to put a threaded steel insert in a crank arm (a la Helicoil). Turns out it is but the complete repair kit for both right and left crank arms is expensive. I was able to buy, individually, the drill bit, tap and RH thread insert I needed.
This worked, after some fiddling and cursing. I wouldn’t recommend this approach unless you are comfortable with drilling and tapping holes in metal. The good part is that I’m now able to use a RH thread
pedal on the right side with a 165mm crank arm so it won’t unscrew itself.
Knee doc gave me a shot of Synvisc the other day and I should be riding again this weekend.
FSA (supplier of crank arms to Giant) service rep said via email that crank arms for both sides should be available in various lengths. I replied, asking for part numbers and prices...now he has gone silent
.
If he ever gets back to me, I will post info here.