Hi folks, hard to believe that not too long ago we were talking about the 1x11 speed
drivetrains from SRAM as being the latest and greatest. What I have in here is a 1150
GX 11 speed cassette but today we're gonna be talking about the latest GX cassette from
SRAM, in this case is the Eagle, you can see it printed here on the box, so 12 speed cassette
as you can see it in here. What else is on the box? You can see a picture of the whole
drivetrain. Not much here on the back that's just a label from the seller, and the most
important part is on this side of the box. You can see in here this is the actual code
for the cassette, this was built in week 28 of 2017 so quite recent, and this is CS XG-1275
it is a 12 speed 10-50 is the range and you can see that's made in Taiwan. This tiny little
sticker here is usually the serial number of the part. Little piece of tape here just
cut that off, as soon as you do you can open the box. Big piece of foam right here on top
and here is the cassette. The only documentation that comes with it is this little leaflet
talking about warranty you have the few links here where to get the pdfs, the information
on the service, and on the flip side it's gonna tell you that this comes with two years
warranty. The cassette...mighty impressive! Installed upside down as you see it, yes,
this is the biggest cassette that I've ever held in my hand, it is Eagle Technology like
they like to say pretty much everywhere, 500% if you had any doubts, so it's the 10 to 50
teeth and on the flip side XG-1275 10-50T Eagle Technology, Eagle Chain Only, yes indeed,
so you need a 12 speed specific chain for this, and yes this is XD compatible only.
The GX Eagle is a fully pinned cassette and you can see the stainless steel pins throughout
the cassette from pretty much the 50 all the way to the 10 and they do this just to reduce
cost. You have stamped steel on all the cogs but the 50 and as a matter of fact that is
no different than the former cassette, pins throughout, the only major difference being
that this one is steel 10 to 42, this one, the 12 speed is actually an identical cassette
with the other one and it just adds the 50 tooth to it. So what do I mean by that? If
you look here I have the 10-42 tooth 11 speed, I have the 10-50 12 speed. If you look at
the spacing here, you pretty much have the same cogs all the way up to the 42 and then
the difference on the 12 speed is that it adds this 50 tooth aluminum. If you look here
on the 11 speed you have a 3.8mm spacing between cogs, they've reduced that to 3.65mm. So that's
the difference on the cassette itself. Obviously they had to go with a narrower chain and if
you look at the chain here they went from 5.6mm width chain they went down to a 5.25mm.
So they've reduced the spacing between cogs, they came up with a narrower chain, and actually
they made a slightly wider cassette. Let me show you what I mean. So if I am to look at
the height of the cassette this one comes up to 44.33mm ok. You don't see clearly here
but there is a little bit of a gap and the gap comes from the fact that, on the 10-42
I only need a 40.87mm so what was that 41...so I'm talking about a 3.5mm taller cassette
for the 12 speed as opposed to the 10-42 which is the 11 speed. As you can imagine the 10
speed here, the 10 teeth cog starts exactly in the same spot as it gets installed on the
XD driver which means that my 50 here is gonna sit closer to the spokes. How much closer?
We're talking about 3.5ish mm closer to the spokes. I mentioned the XD Driver, you see
one of them here, designed specifically for these cassettes. Pretty much two contact points
between the cassettes, you have here up top which is usually right around this top bearing,
you have a contact point over there. Then you have the spline down here where the cassette
engages with the freehub. Make sure you grease that area and then you have the threaded,
the threaded portion right here. If you look on the cassettes themselves you're gonna see
that they come with a o lot of grease already covering that area. Both cassettes get installed
the same way, all you need is a cassette tool that engages right up top here, it's a 40Nm
that is not marked anywhere on these cassettes. If you are to look closer, yes these are pretty
much the same cassette with one extra gear added to it, but if you look carefully you're
gonna see that this last cog over here, or second last, the 42 and the 50 are very carefully
machined and you have all kind of ramps and gates right here on the side. If you flip
this one over you're gonna see that some of the teeth over here have a narrow wide like
profile however it's only to be seen on this side and not on the interior of the 50 tooth
aluminum cog. Look at the 160 rotor, diameter for it is pretty much 8 inches in diameter,
8 inches meaning pretty much 20cm. If you want to see it here compared to an 180, here
it is, it's still smaller than a 180mm disc, and yes if you want to see it on a dinner
plate here it is. If you look at the specs this is supposed to come up to come up to
450 grams, it comes up to 448, my old 10-42 GX comes up to 392 so we're talking about
what...55-56 grams difference between the 11 and the 12 speed GX however on this guy
you're definitely getting an extra speed and the so promised Eagle technology that is supposed
to be designed with the whole drivetrain in mind so it's supposed to work a lot better.
If you have any specific questions about this let me know in the comments below. Since many
of you asked me if you look in the description
you're gonna find some links where you can
buy the cassette or the cassette tool or anything
else that I'm going to be using going forward
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and until next time I'll see you on the trails guys, cheers!