Downtube Shifters
How do these things work?? I just bought my first road bike, and it has downtube shifters; however, I don't know how to use them. What do the left and right lever do? Is there a standard or it varies depending on the bike? I looked this up on YouTube but the videos there describe how well they work and such, but I could not find a tutorial on how to actually use them. Thank you in advance for your help and guidance!