I had a 17 front sprocket and the standard 46 rear, I have just changed the 46 to a 43 with the 17 drive and it just lowers my rpm at cruising at 50 to 55 MPH. I now get an extra 4 MPH at 6000Rpm but still end up with the same top speed as with the 46 rear sprocket at around 68 MPH. 17/46 gets 50 MPH at 6000 and 17/43 about 54 Mph at 6000. I am at about 1200 miles on the clock, adjusted the valves twice at lower mileage and have never had any problems whatsoever and am very happy with the X-Pect,
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