Any help in what front pedal crank replacement gears to buy for my old Rockhopper. It is a Altus A-10 crank. I believe the crank to be fine but the gears look to be worn quite a bit. Took it to a bike shop and they replaced the rear wheel gears, but still slips a little. 
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The "front pedal crank gears" are called chainrings. Just searching for the word should find several options.
There are several different bolt circle diameters for 5-bolt mountain bike chainrings. It's best to measure. Aftermarket parts from brands other than Shimano are fine, look for chainrings designed for 8 speeds or less and correct bolt circle diameter (BCD).
For changing the chainring, you need a chainring bolt tool to keep the other side of bolt from spinning.
