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If you need to change it to 70%, just do this:
var leftgear = document.getElementById("spin"),
rightgear = document.getElementById("spin2");
var multiplier = 0.7;
window.addEventListener("scroll", function() {
leftgear.style.transform = "rotate("+window.pageYOffset*multiplier+"deg)";
rightgear.style.transform = "rotate(-"+window.pageYOffset*multiplier+"deg)";
});
You can change the multiplier to whatevery you want and it will go at a different speed.
Source:stackexchange.com