Originally Posted by ovoleg

Shall we now discuss safety? I like to be safe and efficient on my bike. When it comes to cornering, nothing beats stack height and clearance!

I will compare the Ti versions because otherwise it gets a little confusing and people get hissy fits over the facts(facts don't lie kids)

Speedplay Zero Ti
Weight(pair): 164g
Engagement: Double Sided
Zero Float Lockout: YES
Stack Height on 4 hole mount: 11.5 mm
Stack Height on 3 hole mount: 8.5 mm
Float range: 15 degrees

LOOK Keo TI
Weight(pair): 193g
Engagement: Single Sided
Zero Float Lockout: Yes but have to get different cleats
Stack Height on 4 hole mount: NOPE, only 3 hole mounting!
Stack Height on 3 hole mount: 17.1mm
Float range: 10 degrees

SPD-SL
Weight(pair): 279g
Engagement: Single Sided
Zero Float Lockout: Yes but have to get different cleats
Stack Height on 4 hole mount: YES
Stack Height on 3 hole mount: 13.7mm
Float range: 6 degrees

So what have we learned from raw data above? Oh that's right! LOOK has epic stack height. SPD-SL has even higher stack height and extreme weight.

Have fun cornering in criteriums with terrible pedal clearance on LOOK + SPD-SL! Don't descend down switchbacks too fast either!