Hey Murray...I've got the Vista on my bike with aftermarket grips. Works ok...when climbing a hill you loose speed, when coming down a hill, you increase speed well over where you originally set it. When I purchased it, the parts guy told me it works well and that he had ISO's on hisbike which are the thickest grips you can get, and had no problems installing it on his bike. Take your time, and I don't think you will need the long rubber insert since your grips are so large, and already have rubber on them.