Speeds achieved on indoor tracks are usually greater than those on roads. Other factors affecting speed are the route profile (flats and hills), wind conditions, temperatures and elevation. At a 2013 event in Mexico, Fran?ois Pervis achieved an average of 21.40 metres per second (77.0 km/h; 47.9 mph) with a flying start over 200 meters. The top average speed over the men's 1 km time trial at the 2004 Summer Olympics was 16.4 metres per second (59 km/h; 37 mph) recorded by Chris Hoy. Average speeds clearly drop with increasing distance, so that over the 120 km Cootamundra Annual Classic it is 11.8 metres per second (42 km/h; 26 mph). In the 259 km 2010 Paris-Roubaix, Fabian Cancellara set a speed of 10.9 metres per second (39 km/h; 24 mph), while over the 818 km Furnace Creek 508, the speed drops dramatically to 8.3 metres per second (30 km/h; 19 mph). For an extreme road distance such as the 4800 km Race Across America, the average speed of the record holder is 5.7 metres per second (21 km/h; 13 mph), while the 2350 km Freedom Trail over mountainous terrain in South Africa is at a record speed of 1.9 metres per second (6.8 km/h; 4.3 mph).
一天40miles, 分两次骑,平均每次20 miles,也就是32公里左右。根据上面所述男子自行车赛车世界纪录,在不同的距离段,有不同的速度纪录。一公里赛程,最快均速是37 mph. 120公里赛程,最快是26 mph. 这只是一个reference,是人类至今所能达到的最快速度的衡量。注,取得这些纪录的是(1)男人 (2)专业运动员 (3)有不经查实的故事说,很多竞赛车手服用药物。那一个业余女生骑车,三十二公里的车程,时速是否能达到20mph? 我看悬。