What is the most common part of the bicycle that needs adjusting?

The most common part of the bicycle that needs to be adjusted is typically the seat. Most of the time it's due to a low seat that causes the injuries. Having the seat height adjusted properly will help with many of those injuries. Improper seat height tends to cause knee cap problems but then also can cause low back problems and even work its way up to shoulder problems too and hand.

Another injury we might see would be neck pain and that might be due to having the seat too high and leaning forward too much and having to look up then, or having the handlebars too low and then the person's leaning forward too much and having to look up.