There are 4 total slack-cam rings available for the Profile ZCoaster™:

Slack Cam A - 20/33/45°
Slack Cam B - 60°
Slack Cam C - 75°
Slack Cam D - 90°

Before you choose, make sure you watch each video to figure out what best works with your riding style.

Utility patents and design patents pending.

Slack-Cam Ring Options:
A: https://www.youtube.com/watch?v=5kTHChOop_M

B: https://www.youtube.com/watch?v=J4qErZuaxa0

C: https://www.youtube.com/watch?v=W2BwgFv2lVo

D: https://www.youtube.com/watch?v=ZfBVGVLUv4w