Bike Frames

MTB derailleurs are all semi-rigid support frames and gear, for example, Revell, DMR, identity

Thank you

The answer to your question is no. Not all frames can be equipped hardtail with gears.

The adjustment of parts of the bike is one of the questions ... when the frame is designed, the geometry should be developed to ensure the proper functioning of components. For example, a typical front derailleur requires an angle measuring 61-66 degrees between the seat tube and fork to use.

In addition, the rear-wheel spacing which in turn may change which may or may not allow proper installation of the rear wheel.

Then, of course, you have other things like threading and alignment that may or may not be suitable for mounting gear.

Probably not "all", but most. Some managers are a single speed hardtail.

Most. Just look at frames with horizontal dropouts. These are the slots in the back of the bike that your rear wheel shape. If it can it will take gear vertical slots of the wheel to enter and a derailleur hanger.

Yes the key is in the back stall. You will also have a larger space
Carlos
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N Some executives are single speed hardtail. Some jump bikes are not designed to take front derailleurs.

I think most of them, but some are followers of the Sprint (SS) from the design. Some frames are designed to be used both adapted and single speed (such as Santa Cruz Chameleon), and you can convert most of HT based on a single speed change some things.