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I purchased a pair of Sora BL-3500 brake levers second hand. These were sold without handlebar clamp bolts. I optimistically thought I could re-use the ones from my old mid 1990's Shimano brake lever and shifter combination. Turns out they are of a different pitch. I have been trying to confirm the correct size, but can't find the specification for this model. I do find a specification for other models (including recent model MTB brake levers): M5 x 18 (and I believe 1.0 pitch).

Is this the correct bolt size for my Sora brake levers?

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They're very likely to be M6 x 1.0mm pitch. I'm not sure how long, but its probably within the 15-20mm range, and you can easily measure that yourself with a ruler or something. This is the same diameter as your headset preload bolt, so you could use that to verify if needed.

M5 x 1.0 doesn't readily exist. The standard thread pitch for M5 is 0.8mm. The standard pitch for M6 is 1.0mm.

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    Thanks, I'll try with a headset preload bolt to see if it matches! Nov 28 '21 at 12:48
  • Headset preload bolt fits, length should be about 18mm if it's not to stick out too much. Thanks for your help! Dec 2 '21 at 9:09
  • @Superman.Lopez My pleasure.
    – MaplePanda
    Dec 4 '21 at 21:52

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