Long story short: Only after 8,000 miles (of my 50,000 mile warranty), my tech. ( who installed the kit), says I have to replace the chain, front and rear sprockets, AND, he called Motor Trike who said it was wear parts AND THEY WOULD NOT REPLACE UNDER WARRANTY ! REALLY ! Only after 8,000 miles....I learned a very expensive lesson, that I may turn over to my attorney.