Looks like it's catching about 1/3 of the sprocket(small brake rotor on this/right side).
well I run (3) of the (6) products listed..... thats sick 6.46 @ 220 mph dammmmm! looks like a 115 lb jockey but nonetheless thats no joke!
Found a 6 yr. old picture of the jockey(Joey Gladstone,on the right),Teasley on the left only goes about a 135 lbs. but since this pic I'm sure Gladstone is a little bigger by now.
http://www.dragbike.com/dbnews/articlefiles/090809_image016.gif