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Speedplay zero with Ti axle, cleats, screws, 3 bolt adapter, keep on kover = 164g Approx £120 with £30 cleat cost
Ritchey Echelon, cleats, screws = 161g £60 with £10 cleat costThey are not comparable pedals--- the interfaces are qute different. If it just about weight why not the Cirrus Ti--- only 125g(!) with complete hardware vs almost 100g more the Speedplay Nanogram 4-hole? But, of course, it is not just about weight. That is why the Speedplays are favorites around here despite their relatively high cost of ownership-- why are are also the favorite pedals to bitch about.
(Personally my favorite pedal was the hefty old Time EQs but, unfortunately, they are long out of production and consumables such as cleats are increasingly rare.)
Speedplay zero with Ti axle, cleats, screws, 3 bolt adapter, keep on kover = 164g Approx £120 with £30 cleat cost
Ritchey Echelon, cleats, screws = 161g £60 with £10 cleat cost
Take what you will.