Bicycle Repair/grinding when I pedal

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Question
Hey James!
I'm Tom Houser, the expert at the vball site.
I own a Trek Navigator 300.  It's about 10 years old and it's probably got 15,000 miles on it, all on asphalt.  
I'm getting a grinding noise when I pedal. It's getting louder and louder.  I'm 99% sure it's not the gear shifter.  I have replaced a ring full of ball bearings in a previous bicycle (sorry don't know the right phrase), and figure either the rings are dry/greaseless, or they again need replacing.  I was going to attach a pic, but can't find out how.  If you wish to email me, it's  

Answer
Noise such as exhibited is likely caused by a worn out bottom bracket bearing--the bearing/spindle to which the crank arms and pedals are attached to. It's time to replace that bearing. Your best bet is to have an appropriate sized cartridge-style bearing refitted. Measure your frame width at the frame shell, along with the spindle length for a suitable replacement. Any competent bike shop should be able to help.

Bicycle Repair

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James Novak

Expertise

I can answer most inquiries with respect to bicycle assembly, repair, tuning and maintenance. I am less than inclined to speak on such questions as "What kind of bike should I buy?", &/or "What is this bike worth?", etc. Any answers to these types of questions may correlate poorly to an acceptable "fact/sarcasm" ratio.

Experience

7 seasons of "Professional" bicycle service/repair, etc. 4 seasons as Instructor, Professional Bicycle Mechanic training college. n-1 seasons of riding, cracking, crushing, mutilating and breaking bikes of any & all varieties, and thus requiring intense and at-hand skills development, etc.

Education/Credentials
Certified Professional Bicycle Mechanic; Winterborne Bicycle Institute/Conestoga College

Past/Present Clients
The Hub Bicycle Shop, Hespeler Winterborne Bicycle Institute

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