Features:

• Easy dual-sided entry: no kicking it over, no looking down, no fumbling.
• Half the weight of most other clipless systems:
  X/5 Chrome-Moly pedals per pair - 220g
  X/2 Stainless pedals per pair - 198g
  X/1 Titanium pedals per pair - 150g
  X cleats per pair - 85g
• Non-centering free float minimizes the potential for knee strain.
• Unbeatable cornering clearance: X/1 - 39 degrees; X/2 - 37 degrees; X/5 - 35 degrees.
• Large contact area, extremely stable cleat-to-shoe connection.
• Compatible with virtually all 3-hole and 4-hole shoe mountings.
• Standard step-in, turn-out entry and release.
• Built-in grease port for easy bearing lubrication.
• True locking mechanism - engagement security is independent of spring tension.
• NEW X/5 features needle and cartridge bearings for improved durability and easier servicing.
• X/5 incorporates an earlier release angle than the race-oriented X/1 and X/2. The X/5 needs only a slight heel twist to exit, so you'll have no worries about getting out when you need to.

Note: X-Series pedals are not compatible with Speedplay Zero cleats nor are X-Series cleats compatible with Zero pedals.

Shoe Compatibility Chart
http://www.speedplay.com/index.cfm?fuseaction=shoeguide.searchroad