Bikes Bikes Bikes!  Yikes!!!  More Bikes!!!
So what sorta bike are ya itchin' to read about?
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Here's 40+ good reasons for bicycling!
Already got a bike?  Then...you need to consider accessorizing! Check out some helpful ideas and information to make your biking experience more enjoyable. 
But at least you'll be in good company!
www.mtbr.com is a great mountain biking resource site.  You can find information about even local stuff like where the trails near you are...and read about their descriptions and user comments!  That's my favorite thing about it...is that users like you and I can post messages about the bicycles, bicycle products, trails, etc.  Of course you have to take things with a grain of salt, but hey, it's sort of like democracy in action (or gone wild).

It also has a VERY comprehensive review of bicycles, their components and accessories.  Whenever I shopping for something, I'll check them out to read what other people have to say about the item.
Here is a description of some mountain biking tricks that can be done with some experience and skill.  Impress your friends!  Or...just get 'em to say..."Aren't you a little old to be doing that?"
Learn how to do some of the routine maintenance items yourself!
Know your way around your bike...learn your bike anatomy!
Bike Maintenance
Some advanced concepts in biking you might like to read about...
tires:  clincher, tubular & tubeless
29" mountain bike rims