Mountain Bike Quotes

The gears on my mountain bike does not move at all. How much would something like that cost to repair?
I can only go at a speed, which makes it very difficult hills. I'm having trouble finding quotes on the internet. Any help is appreciated.
Need more information. Could it be that only needs a simple adjustment. It could be a cable needs replacing. Could the shift lever has been spoiled. In any instead of $ 20 on up – depending. All I know bike shops give free estimates. That will not cost a penny.
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