I suppose most of the people have noticed it. While adjusting both front and rear derailleurs, it will shift accordingly, when you have adjusted or are adjusting it, but when you test it by riding, the adjustment fail to perform the same way, Why does this happen? 

How does the added weight affect the shifters?


Question: Which one of these is more appropriate for academic email
Answer: Using the firstname sends a signal of casualness. If you want to signal professionalism it's not a good strategy. 

It's a bit like wearing a suit and a tie. You are sending a signal by wearing those clothes. 
There are professional contexts where you have to wear a suit and a tie. If you move mainly in those contexts, firstname@ieee.org might appear for people to be too casual. But it's not strong and I doubt that it will offend anyone.

The fact that you have an email address @ieee already signals some professionalism.

If you however move in areas where people don't wear suits and ties, firstname@ieee.org might be entirely okay.