Running shoe weight/size

obviously if you don't know, they don't want you to know, just some Google digging could get you the answer you want

Men's shoes are based on the weight of a size 9 d width, a size smaller than most grown men wear, but used to be the mean way back in the day. Women are based on a different size, women's 8 b width. The difference in weight from the size used for measurement to the size actually worn is trivial and no one accounts for shoe weight who isn't attempting a national or world record. When weight is calculated in a different measure, the shoe manufacturer usually states it on their website - but its seen as incredibly amateur to calculate running shoe weight based on a different size than the standard men's 9 or women's 8. For unisex sizing, the sizes and weights are based on men's shoe sizes - they're just men's d width sizes. Few manufacturers make anything but d and b width shoes (new balance is one of the few) and the difference in weight from a d to e or b to c shoe is trivial.

Thank you for your detailed answer. However, I disagree that only those concerned with records care about exact shoe weight. I certainly do and I think a lot of other runners do - we tend to be obsessive about many aspects of running - hence the popularity of Strava.

That's fine, but you're wasting your time. You'll run better in something that fits and feels better than the lightest shoe on the market. In most cases, you could save about 2 oz going from trainers to racing shoes, maybe 4 if you use the lightest shoe on the market or spikes (but the difference between average spikes and the lightest spikes is less than 2 oz). So you're looking at less than half a pound lighter in most cases, so about 1.5 sec faster in 5k due to weight - but you'll prob run slower because you'll feet will be hurting. More likely than getting a pr from this savings is that your feet or calves get injured.

Thinking footwear weight matters over function is a mistake a lot of amateurs make.

For me (US size 10.5), I don't really care about weight/size ratio. However people with shoe sizes way outside the norm might be smart to actually weigh their shoes before wearing them.

As a second hand anecdote, there was a shoetuber with size (13?) that weighed a new pair of racing shoes to be way heavier than the stated size 9 weight and compared to his other size 13 shoes, even trainers. Point being, at larger sizes, two different size 9 racing shoes weighing 7.5oz might weigh 9.75oz in one and 11.5oz in the other at size 13. That's a big enough difference to want to know in advance. Especially at $260+.

My size 17's, when I can find them and in whatever brand, are always heavier than yours.