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ewanmac-
Pics to compare?
2004&2005 is ©http://www.dgs-cyclingphotos.org/, 2014 is by somebody on here who will be given credit if they identify themselves.
gbj_tester
Depends on the yaw angle, the ridges might act as trips :-)
In a decade of tweaking , you could probably find 50 different things which have been changed, each of them accounting for a small improvement.
FWIW, over the same period, I've gone from 25:56 (2004) to 22:31 (2014) for my best 10 mile times, oddly both done on the H10/8 in Charlotteville promotions.