Running Shoe Weight and Performance

Did last Wed a 8K workout with Vane on Inva. Not that great, just modest 3.45/km pace. Was too close to lunch.

Anyway, after the run talked about shoe weights and how that affects your result. Vane was convinced 50g translates to approximately 1 second per km. Inspired from his tables here’s my gear as of today. All shoes are European size 42, US 8.5:

Shoe Weight Notes
Adizero CS 234g The winner. I’ve run probably the best races with these. Unfortunately they don’t do these any more… According to forums the replacement is Adizero Adios.
Adizero ? 252g Lacks cushion and form. For max 10K. Probably the model is Adizero RC, which they don’t make any more either. In the current lineup this would be Adizero Pro.
Adizero Boston 267g My default choice for races and fast training. Especially good for trail runs. Have one unused pair left.
Mizono Wave Elixir 6 278g Goettelmann sold these to me. Pretty good for trail training, but not the best racers.
Adidas Response Cushion 19 293g I’ve done most of my marathons with these or the previous version, including 2007 Chicago and 2010 Boston. Heavier than I thought.
Mizuno Wave Inspire 8 304g My latest grab from Goettelmann. Good for even asphalt runs. Again, the weight came as a surprise.

Does this mean I could have run e.g. Boston almost 2 mins faster with Adizero CS’es? Hard to believe. The longer the distance gets the more it also matters the shoe keeps on rolling and supports your form when your muscles start to fade. For example one reason I had hard times at Helsinki City Marathon in 2010 was too lightweight shoes (Nike Zoom Marathon) without appropriate support.