Just keep in mind you need to account for at least a few grams depending on how many of the spacers you need (between the BB shell and bearing cups). They're made of plastic and weight about 1 gram each.
my 175's weighed 833g, another set weighed 832g - if we keep going at that progression 170's should weigh about 817/818 and seeing as RF's claim is 815 I'd say that's pretty much spot on (well 2-3 g out if you want to get particular).
I also have two sets my last one was 835 grams. I would say go with the black. The silver ones get a funky discoloration after a while. I think the only other thing that would be close for dollars to grams would be if you can find a deal on some of last years xtr I have seen some good deals out there.
I forgot what mine were at first. Currently, with a cheap Action-Tec Ti inner 20 tooth and crank brothers middle and outer (which are the lightest cheap-and-easy-to-get rings I've found), I'm at 804 in silver 175s. Also running alloy outer bolts and OEM steel inners cause of my tiny granny that lets the chain touch the bolts.
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