The first time I adjusted it it was about .5" difference, then I took a ride, and when I got back to the house it had hella slack in the chain, I guess I didn't get the bolts tight enough and it pulled the chain side closer to the front.. This time I got on both ends of the bolts with a 13" ratchet and pusing with my foot on one and pulling on the other got them as tight as possible, anything tighter I'll have to use an impact on it. Maybe that will keep it from moving.