after years of riding with toe clips, i have decided to give my big toes a break and buy clip less pedals and shoes. i am 75 yrs old (76 in two more weeks) and enjoy riding bike-a-thons in new york, philadelphia and connecticut (avg. distance 35-45 miles). i average 50 miles a week on flat course riding (weather permitting). i am a cruiser. my big toes take a beating on climbs. i have tried a number of different shoes with the toe clips. i was advised to buy a used set of sidi genius shoes and shimano dura ace 7810 pedals to ease my toe clip annoyance. the used set is about $175. i can get some used shimano dura ace 7550 or 7800 pedals on ebay cheaper....i just don't know what the difference is, they all look the same. on fixed income, a new set is not an option this year. the shoes fit but the owner of the set says i should buy his 7550 pedals because the cleats have been matched to the pedals and they have a 6° float (???). my bike is a 10 speed; 52/44 chain ring, 14/18/22/27/34 cassette. for this coming season, i have changed my chain ring to 48/38 (the bike shop made the derailleur adjustments. i am hoping that the reduced gears and new pedals and shoes will help my hill climbing in the upcoming bike tours (especially connecticut). any comments and/or advice would be appreciated.