What is the difference between a KEO CLASSIC 3 and a KEO CLASSIC 3 PLUS? The material used for the contact area. The little extra stainless steel rather than composite optimizes pedal stiffness and hence the transfer of power from you to your bike. As for the rest we stick to what works: fast clip in / clip out and easy tension adjustment. WHY YOU'LL LOVE IT?THAT LITTLE EXTRA WHEN IT COMES TO STIFFNESS Large wide contact area for excellent stability thru the pedal stroke A total weight of 350 grams all included All of LOOK's expertise at an affordable price SPINDLESpindle material: Chromoly BODY and PLATFORMTechnology: SpringBody material: CompositePlatform material: Stainless steelPlatform area: 400 mm²Platform width: 60 mm RETENSION and CLEATSRetention: 8 to 12Cleats: KEO GRIP WEIGHT and ACCESSORIESWeight Pedal: 140 grWeight pair + cleats: 350 grStack height + cleats: 178 mm