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I need to change my disc brake rotors. I discovered that I require a star tool. Here is a picture of my rotor bolts. Can someone point out a tool that will fit this? Prefer a bike tool.

To give some indication of its size. The first size of hex key that becomes too big to fit within the star is: 4mm. 3mm fits within the star.

I have one of those wonderful screw drivers that come with 40 or so heads to fit all those different screw types (cheap china Ebay job), but the star in this kit does not fit snugly and I don't wish to risk rounding.

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    For a moment I thought that for some reason you need a magical star tool that can unscrew six torx screws at the same time, like in a Formula-1 pitstop, where they change tires in a blink of an eye.
    – Tadeusz A. Kadłubowski
    Feb 23, 2012 at 10:07

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You want the correctly sized Torx driver. When I had to swap to a new wheel set I used a T25 driver.

I just found a Park Tool TWS-2 that has 9 different sizes. You can probably find just a T25 driver at a hardware store.

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  • Thanks! Found the tool online. Will stop over at the hardware store tomorrow. Great if I can fix this problem before the weekend.
    – Valamas
    Feb 23, 2012 at 8:25
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    Yes, was T-25 .
    – Valamas
    Feb 23, 2012 at 11:18

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