Originally Posted by
noglider
SPDs are fantastic. They are all I use. There is a slight chance your cleat will come out if you pull up hard, as in a sprint in a race, but really, how often do you do that? Some roadies and trackies use SPDs, though not commonly. I don't know why they're thought of as for mountain bikes only. They work in so many situations. And there are so many pedal and shoe styles to choose from.
Yes, they will pull out even with new pedal/cleats with max spring force set. And they will come out at the worst time like a sprint
Because of this experience I switched from Shimano SPD to Time ATAC. The ATACs do not pull out and are even easier to clip in. Downside is the cleat lifetime is a bit shorter.