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A quick search turned up this post, in which the OP is having the same trouble. It sounds like your crank is swaged to the chainrings, as in this image: "Swaged" means the "spider" (the group of radial arms that hold the chainring) is press-fitted onto the crank arm. A better design is to manufacture the crank arm and spider as one piece, like this: ...


2

Make sure he understands the power of the front brake - you can demonstrate this by passing at a constant speed and hitting one of the breaks at a constant pull force - the rear will skid. This one helped me a lot with my riding. Show him how easy it is do do an endo. On a grassy field the risk is zero, the time to learn to get up on the front wheel (and ...


1

I hate to say it but this is why it's advisable to go to a bike shop, if you're not sure about setting things up. You raise a couple of points: Front disk brake. Regarding your original problem, the rotor should not rub against the pads, period. There should be no contact unless you're actually braking. And when you stop braking, the pads should sit back. ...



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