I replaced the rear derailer on my bike after Schwinn sent it to me. The old one had a bent piece.
I can't shift onto the largest 2 rear gears. I set the shifter to the lowest setting, but the chain won't shift onto either of the 2 largest gears.. It looks like the rear derailer isn't aligned straight with the rest of the bike.
In comparing to another similar bike I have that works fine, I can see that the rear derailer on the properly working bike is perfectly aligned compared to the gears.
Update : I just fixed this (thanks to the suggestions) by tightening the tension cable and also by loosening the H Screw (assuming that is what it is called)...it works perfect now..
update 2 : This question seemed to have got a few views and so updating with some additional information.
The first video sent to Pacific cycles
They were awesome and sent the derailleur (I did not know what this part was called earlier) to me and I put in the new derailleur and then asked this question on stack
I sent the question above to Pacific cycles also and they also replied
with the help of folks here and Pacific cycles I was able to fix this Luckily in my case it was a simple issue