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Any idea what might be up with it?
I had one like this. I think it’s too much threadlock from the factory - could try heating it up either by dragging it for a few steep descents then try again or tip of a soldering iron etc.
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I assume this is the inner one? You'll have better access if you remove the wheel then you should then be able to use a regular Allen key.
Howard
coventry_eagle
@mashton
I have just got my first ever disc brakes bike, a Marin Four Corners with TRP Spyre mechanical 160mm brakes.
Each side of each caliper has a 3mm allen key port for adjusting the pads in and out. Presumably these are used to centre the pads on the rotor and adjust the lever pull?
One of them, on the rear caliper will not turn, either way, even with a near worryingly large amount of torque. The other three turn effortlessly.
Any idea what might be up with it?