It depends on what you are capable of using. If you have 'G' rated rims use Goodyear 614's. If you have an 'E' rated rim then Michelin. The Michelin is an "E' rated tire and the Goodyear is a 'G' rated tire. Do NOT use a 'G' rated tire unless you have a 'G' rated rim. Using a 'G' rated tire on an "E' rated rim can cause a catastrophic tire failure.