I bought new Schwinnvarsity at walmart I been riding it for 100mi it fun but how to make the handlebar tallr?

Answers:

What is a good mountain bike to start with for beginning xc racing?

You can get a longer stem at your local bike shop, but you will also need to replace your cables and housing at the same time.
You can also check into an adjustable stem(the angle of the stem is adjustable) so that as your body becomes more accustomed to riding you can lower it in small increments to get back into a "racey" position. Main thing is to be comfortable and have fun!

Where can i sell my used bikes in Denver CO?

here is a link

The website for concorpe racing bicycles?

You need to get a longer stem. If you take it to any local bike shop they should be able to change it out for you for around 40 or 50 dollars.

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