Yes, the first four pictures look like the old cassette and the splined centre needs to be removed with a removal tool, you may need to ask a bike shop to remove that for you Alberto.
Once that's off you can screw on the new freewheel with it's sprocket set, assuming the BionX has a standard thread for that, I feel sure it must have. I don't understand the references to measurements and the rear frame measurements or why that's necessary. Perhaps you could explain further Alberto?
Once that's off you can screw on the new freewheel with it's sprocket set, assuming the BionX has a standard thread for that, I feel sure it must have. I don't understand the references to measurements and the rear frame measurements or why that's necessary. Perhaps you could explain further Alberto?
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