Here are some combine numbers for the current top 20 RBs on the FBG dynasty list. I obtained most of these numbers from nfldraftscout.com.
Prospect Name - 40 time - broad jump - vertical leap - shuttle time
Edgerrin James - 4.38, N/A, N/A, 3.88
LaDainian Tomlinson - 4.46, 10'4", 40.5", 4.21
Brian Westbrook - 4.57, 9'10", 37", N/A
Larry Johnson - 4.45, 10'4", 41", 4.28
Steven Jackson - 4.55, 9'10", 37.5", 4.09
Frank Gore - 4.58, 9'1", 34", 4.11
Marion Barber - 4.49, 10'7", 40", 4.17
Ronnie Brown - 4.43, 9'9", 34", 4.14
Ryan Grant - 4.43, 9'7", 33.5", 4.14
Brandon Jacobs - 4.56, 9'10", 37", 4.49
Joseph Addai - 4.40, 10'5", 38.5", 4.48
Maurice Drew - 4.39, 9'8", 36", 4.41
Laurence Maroney - 4.48, 10'3", 36", N/A
Reggie Bush - 4.37, 10'8", 40.5", N/A
Adrian Peterson - 4.40, 10'7", 38.5", 4.40
Marshawn Lynch - 4.46, 10'5", 35.5", 4.58
Jamal Lewis - N/A
Clinton Portis - N/A
Willis McGahee - N/A
Willie Parker - N/A
Range of 40 times: 4.37-4.58
Average 40 time: 4.46
Average for the top 5 (Peterson, Tomlinson, Westbrook, Addai, Jackson): 4.47
Range of broad jumps: 9'1"-10'8"
Average broad jump: 10'1"
Average for the top 5: 10'2"
Range of vertical leaps: 33.5"-40.5"
Average vertical leap: 37"
Average for the top 5: 38.4"
Range of shuttle times: 3.88-4.58
Average shuttle time: 4.26
Average for the top 5: 4.26
(NOTE: I used Gore's time for the top 5 since I couldn't find a time for Westbrook or Parker and Gore was next on the list)
Some interesting notes:
- Only one of 15 backs had a vertical leap under 34". 12 out of 15 had a vertical leap greater than 35". That's 80%.
- Only one of 15 backs had a broad jump under 9'7". 11 out of 15 had broad jump of 9'10" or more. That's 73%.
- Only four of 16 backs had a 40 time of 4.50 or higher. 12 out of 16 had a 40 time of 4.49 or better. That's 75%.
- Only five of 13 backs had a shuttle time higher than 4.28. That's 38%.
- The top 5 runners had a slightly better vertical leap and broad jump than the the top 20 as a whole, but they showed no difference in the 40 time or shuttle (they were actually slightly slower in the 40).
This isn't a perfect study for a number of reasons, but I do think it supports what I've been saying. A strong majority of the top NFL runners have a 40 time under 4.50, a broad jump of 9'10" or better, a vertical leap of 35" or better, and a shuttle time of 4.28 or faster. Yet there appears to be a little more wiggle room in the shuttle, with over a third of the elite runners having times of 4.40 or higher.
I think you can draw the following conclusions: When you're looking at RB prospects, you should look for players who run under 4.50 in the 40, jump over 35" in the vertical leap, jump at least 9'10" in the broad jump, and have a shuttle time of 4.28 or better. There's some margin for error, but most of the elite pro running backs exceeded these minimums.
For comparison, here are the combine numbers for this year's top backs:
Darren McFadden - 4.33, 10'8", 33", N/A
Rashard Mendenhall - 4.41, 9'9", 33.5", 4.18
Jonathan Stewart - 4.46, 10'8", 36.5", N/A
Jamaal Charles - 4.38, 10'2", 30.5", 4.22
Felix Jones - 4.44, 10'4", 33.5", 4.19
Chris Johnson - 4.24, 10'10", 35", N/A
Ray Rice - 4.42, 9'11", 31.5", 4.20
Matt Forte - 4.44, 9'10", 33", 4.23
Tashard Choice - 4.48, 9'11", 34", N/A
Kevin Smith - 4.53, 10', 32", 4.49
Steve Slaton - 4.45, 9'10", 33.5", 4.27
What immediately stands out are the low vertical jumps. The marks are so low across the board that there was almost certainly something wrong with the initial measurement process. I think they were off by about 1 to 3 inches based on the improvements Slaton, McFadden, Jones, and Smith made at their pro days (all of them doing at least 1" better).
If you add 1.5" to the verticals, you'll see that most of this year's top RB prospects meet the minimums. I don't think we can really eliminate any of these guys solely based on the numbers, but the numbers suggest that we might need to be wary of Jamaal Charles, Ray Rice, and Kevin Smith. Smith in particular stands out since his 40 time, vertical, and shuttle are all sub par. The numbers say avoid him.
Jonathan Stewart and Chris Johnson probably have the best overall marks. They're the only two guys who come close to meeting the top 20 averages in every drill. McFadden also has good numbers given his low 40 time, his monster broad jump, and the respectable 35.5" vert he did at his pro day. The rest of the guys have solid, but unspectacular numbers.