The fastest and slowest courses in the country, deduced from the average speed of a notional rider of rank 2000 taken over all the events run on this course. This includes all events from 2017 and 2018.

Many courses have only one event so the results are vulnerable to conditions on the day, for example I understand the day of the M101 was a float day so this course will rank too high in the fastest 10 courses because the only day it was run was particularly fast. It doesn't matter if a course has a very strong field as the average is always for a rider ranked 2000.

Slow courses will be the toughest around. Arguably some of the courses could be regarded as hill climbs, e.g. Tan Hill, but as it is 10 miles long and not scored in tenths of a second it made the cut for Spindata – you have to draw a line somewhere.

Some courses have more than one entry as they have been run as different lengths. This is often due to roadworks or multiple laps but some are inexplicable. It would be great to iron out these discrepancies and if anyone can explain any of the anomalies please let us know and we can correct them - see Course Discrepancies.

Count shows the number of events on each course over the 2 years.

Slowest Courses

 CourseDistanceAve SpeedCount
1 THC30 10 14.481 1
2 THC30 10.3 14.500 1
3 HCC212 18.8 17.622 1
4 T405 40.15 19.274 2
5 M40 38.6 19.485 1
6 J8/23 27 19.711 1
7 J8/4 25.6 19.837 1
8 HCC269 18.8 20.125 1
9 J8/3 33 20.148 2
10 M24.8 24.8 20.167 2
11 J8/7 18 20.373 2
12 M40 40 20.422 1
13 O12C 12.3 20.537 2
14 J8/3 22 20.563 5
15 NC19 16 20.718 1
16 K22/37 37 20.728 7
17 P911 27 20.910 1
18 O17/C 17.2 21.129 4
19 D32/1 32 21.180 2
20 M27 27 21.385 2

Fastest 10s

 CourseDistanceAve SpeedCount
1 B10/3A 10 28.848 2
2 V718 10 28.690 21
3 M101 10 28.501 1
4 L1015 10 28.211 11
5 F11/10 10 28.167 13
6 P612/10 10 28.108 2
7 D10/15 10 28.096 5
8 A10/14 10 27.801 4
9 P881R 10 27.792 10
10 P881 10 27.776 12
11 A10/19 10 27.696 4
12 F2A/10 10 27.650 4
13 NC50 10 27.648 1
14 B10/3B 10 27.640 7
15 P883 10 27.612 4
16 E2/10 10 27.612 23
17 P415 10 27.552 7
18 S4/10 10 27.489 9
19 F2D/10 10 27.483 6
20 R10/6B 10 27.445 4

Fastest 25s

 CourseDistanceAve SpeedCount
1 T252/2 25 27.676 1
2 J5/8 25 27.582 1
3 R25/3H 25 27.582 43
4 A25/11 25 27.507 11
5 P881R/25 25 27.464 2
6 B25/8 25 27.313 6
7 E2/25 25 27.218 18
8 A25/34 25 27.076 9
9 V232/1 25 27.063 2
10 P881/25 25 27.016 2
11 T252/3 25 26.994 5
12 P884B 25 26.971 6
13 L2511 25 26.952 3
14 L2529 25 26.860 1
15 F2A/25 25 26.819 2
16 L2524 25 26.790 2
17 H25/8 25 26.744 10
18 R25/7 25 26.743 10
19 H25/2 25 26.742 7
20 M2510 25 26.721 2

Fastest 50s

 CourseDistanceAve SpeedCount
1 B50/18 50 26.774 1
2 B50/20 50 26.335 1
3 E2/50C 50 26.173 5
4 A50/6 50 26.153 4
5 S100/50 50 26.093 2
6 T502/3 50 25.990 3
7 P885/50 50 25.946 2
8 L5012 50 25.937 2
9 L505R 50 25.694 1
10 M509 50 25.586 1

Fastest 100s

 CourseDistanceAve SpeedCount
1 E2/100C 100 25.335 2
2 A100/4 100 25.225 3
3 B100/4 100 24.653 2
4 R100/8B 100 24.563 1
5 L10010 100 24.415 2