Talk:Warframes Comparison/@comment-88.195.106.129-20130302150540

That's because their base movement speeds are different. The sprint speed increases the base movement speed by the same amount for all warframes, but the difference comes from the actual movement speed differences, which is more obvious while sprinting.

Ie. light warframes, such as Loki and Excalibur have considerably higher base movement speed than the heaviest, Frost and Rhino. Sprinting increases the movement speed by the same percentual increment, which is why the sprint speed can be same, whilst the movement speed is conceibably different.