NFL Sports editorial source review ·
Calvin Johnson: 40 yard time and speed evidence
The reviewed record lists 4.35 seconds. Source setting: compiled combine record. Read the event notes before comparing that mark with another workout.
Where the time comes from
The 2007 table records a 4.35 second sprint at 239 pounds. Its jump, lifting and agility fields are blank. That source does not support a 42.5 inch vertical or a 139 inch broad jump for the event.
Speed is only one part of movement
A straight sprint measures elapsed time over a fixed distance. It does not measure top speed during a game, running with the ball or the ability to change direction. A start, surface or timing method can affect a comparison between events.
Detroit selected the Georgia Tech receiver second overall. The size and sprint combination explains why the workout attracts attention, but an empty field still needs its own source. A mark from another event or athlete cannot fill the gap.
How to compare the record
Compare the same distance, event type and timing method. A campus report and an electronic event result may use different setups. The reviewed sources here do not provide verified split times or a complete position ranking. Converting this mark into miles per hour would hide how acceleration changes during the run.
What to check for this record
The record supports a sprint and draft measurements, not a complete set of drills. A plausible sounding jump figure still needs a record for the correct event. An impressive playing profile still needs a separate source for each numerical testing claim.
Questions readers ask
What do the timing units mean?
Each listed sprint value is elapsed time in seconds over 40 yards. It is not a top speed reading, an agility drill time or a verified split for part of the run.
Does a blank result mean a slow run?
No. A blank means the reviewed source has no recorded time. It cannot establish a failed attempt, a slow run or the reason for a missing result.
Sources and review method
We checked the linked records for this update. Team and school reports can explain the event. Historical tables compile results and may leave fields empty. We keep that distinction visible and do not claim an affiliation with the source publishers.