How do you measure bolts?- Mtbr.com
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  1. #1
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    Reputation: bikerboyj17's Avatar
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    How do you measure bolts?

    I have a rusted out bolt on my seatpost and i want to replace it with a titanium one. Before I do that i need to know which size bolt to get. Help me out here guys.

    Jake

  2. #2
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    Measure from under the head of the bolt where the thread starts to the end. That will give the length you need.

  3. #3
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    Bicycle bolts are typically described as the diameter size (i.e. M6) times the length (i.e. M6 x 15) all units in millimeters. You need to know the thread pitch as well which is typically the number of threads per unit millimeter (i.e 1.0 which is 1 thread per millimeter).

  4. #4
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    Reputation: Irrenarzt's Avatar
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    Quote Originally Posted by Cline
    Measure from under the head of the bolt where the thread starts to the end. That will give the length you need.
    Unless its a flat head (countersunk) which then requires the entire length of the fastener to be measured for the correct value.

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