the result of the .8 overdrive with a stock 616 will be endless shifting from 5th to 4th for anything but perfect flat or downhill situations. This was my experience. Every mild grade, or even gusts of wind would impact its ability to maintain speed in overdrive.

It was unfortunately far more annoying than pleasurable, though it was great to have that extra gear occasionally, it did not rock my world in the way I had hoped.

Now the .8 overdrive behind a 617 is a whole different ball of wax!

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