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size of SM master cylinder?

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Anyone know the size of the stock SM master cylinder? I have an extra one, and if it's large enough might use it for my other bike which will be running a Magura 4 pot caliper on a 320mm disc.

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I think it is 13mm. However, I suspect it might be too small for a four pot. There have been a few postings recently from engeneering types and they have posted the formulas used to determine the mechanical leverage relationship between the bore of the master cylinder and the bores of the caliper to enable correct size selection.

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