Repairs, maintenance, mechanical issues, or drivetrain parts.

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How do I tune up the shifters/derailleurs on my mountain bike?

I have a Diamondback mountain bike with Shimano shifters that I bought used last summer, and over time the shifting has gone out of whack. For example, on the front wheel I can't shift into the ...
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44 views

Sachs- Huret derailleur (re)installation

Sachs - Huret derailleur installation So the learning curve continues on the '85 Peugeot P-16. The main lessons are to take pictures and time getting each thing done. I have the rear derailleur ...
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Columba folder w/mountain 10sp cassette & Sram X7 derailleur

On my bike the derailleur mounting bracket (hanger) is held by the hub axle and therefore fills some of the dropout slot on one side and pushes the axle lower in the slot on that side. So the axle is ...
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What are these parts?

It fell from the front hub/disc brake/fork area (most likely brake caliper) on my friend's bike which I'm servicing for the first time and I have no idea what they are!