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Cal course foot vs meter discrepancies

I have laid out my first calibration course using a 100' steel tape. The tape did not have meter markings. I measured 1640' and when I did my first ride I got 516.3 clicks (I'm assuming meters on the Jones). The four rides averaged 516.5. This seems like a large difference to me. If I use this constant times the SCPF I get 517. I took this to mean I would multiply 10000 meters by 1.034 (517/500) yielding a course of 10340 clicks. Does all this sound reasonable and is the difference just related to the size of the wheel? Thanks for your help!
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