If you’re having trouble determining which size replacement key you need, here are a few ways to tell for sure:
If the Pitlock is for your stem, brakes, or seatpost, you will need the “standard” key.
If the Pitlock is for your wheel skewer and it uses the same key as the Pitlocks on your stem, brakes, or seatpost skewer, you will need the “standard” key.
If the Pitlock is for your wheels and is replacing a 5mm (“quick release”) skewer or a thru axle, you will need the “standard” key.
If your keycode starts with “#7”, followed by 6 alphanumeric characters (such as “#7ZFRR44”, you will need the “standard” key.
If your keycode starts with “#03”, “#90”, or “#38”, followed by 7 to 10 alphanumeric characters, you will need the “solid axle” key.
If you have a Rohloff, Shimano Alfine, or Shimano Nexus Hub, or any other solid axle hub, you will need the “solid axle” key.