I've installed an 11-46 XT cassette with the XT RD-M8000-GS(short cage) on the bike of a friend.

It is the first time that I put the cable on the derailleur with a little tension, and nothing else.
Perfect shifting the first time without fiddling with the shifter barrel.

We did align the derailleur hanger before as it was a bit off.

Thanks all for pitching in. This is what I was looking for. So if it works with the XT, I suppose it will work with the lighter XTR derailleur also.

I would like to run a 11-46T cassette (SunRace), but need to pick a RD that would work with it.
On the product page, Shimano claims that the 11sp XTR and XT RDs can only handle 40T at the most. Interestingly, they released their own 11-46T cassette and claim that it is compatible with their XT and XTR drivetrains. Would I need to do any modifications to the derailleurs to handle a 46T rear cog?

Similar question on SRAM offerings. All of their 11sp RDs are listed as 10-42T compatible. Would they be able to handle a 46T cog without some kind of mods? Anyone have experience?
As a data point, WolfTooth claims their 49T cassette expander will work with SRAM 11sp RDs.
http://www.wolftoothcomponents.com/collections/cassette-cogs/products/49t-gc-cog-for-sram-and-sunrace

Is this just a case of manufacturers (Shimano and SRAM) being overly conservative and/or protective of their own product lineups?

I'm pretty close to settling on the M062 frame, but have one final consideration about the bottom brackets.
I'm going with the 24mm spindle, so the choice is between BSA threaded or BB92. What's the current consensus?
I've read a few posts earlier in this thread, and also asked for some more info from Workswell. The images they sent me show the BSA insert molded/glued in the frame, while for BB92 they glue in aluminum adapters (that will hold the BB92 press fit cups) on the outside of the frame.
Generally, you'd go with BB92 since that allows the downtube to be wider at the BB junction, and therefore laterally stiffer. But in this case, the frame is essentially the same, width wise. I think actual BB92 setup is about 10-20g lighter than a BSA BB, and the difference in the way Workswell makes the interfaces can also save a few grams over the BSA.

The downside with BB92, as I see it, would be in the greater potential for cups' misalignment. With the BSA you have one shell that the bearing cups thread into. So as long as the shell's edges are parallel to each other (easy to achieve on a lathe), the bearing surfaces would be, too.
With BB92, there is 1) possible lack of parallelism between the aluminum adapters that Workswell presses into the frame, and 2) the BB92 cups may sit slightly un-square in each side. So the possible error and tolerance stackup is greater.

That said, I'm not dissing the BB92 concept in general. I run those in my Scott road frame and my alloy Rocky Mountain MTB frame without issues. But in both cases, the BB92 is integral to the frame design, rather than tacked on, as in the case of many Chinese frames. I believe the newer frames (CS-041/LCM904) come with BB92 only that's molded in, like it should be.

I'm not sure that the 062 has a lot more tire clearance than 057. Activ3 could not use 2.8 650b + on 29mm internal width wheel. Patrick C was using a wider rim. 34mm internal width and the 2.8 tire rubbed the frame.

I'm actually not looking for a ton of tire clearance. I'd be running a 2.1-2.25 in the back, and most MTB frames should be able to handle it.
I was mostly referring to tire pressures, etc. when it comes to effects on comfort.

Quote from: Carbon_Dude on September 14, 2016, 08:21:49 PM

My -057 build was 19.5 lbs with a RS Reba fork, full XX1 drivetrain, carbon wheels, carbon bars & seat post, XT brakes.  If you go 1x then you should be able build an XL at around 20 lbs.

Based on that build, with the new Fox 32 SC (step cast) fork instead of the Reba, (around a half pound lighter) you could probably step down from XX1 to X01 or X1 and still hit the 20lb target, as well. Also don't forget that carbon wheels aren't your only option, the Stan's NoTubes Crest Mk3 are listed in the 360g range, which is the same listed weight as the lightest Chiner carbon rims and quite a bit less.

Thanks for the Crest suggestion. I was thinking going carbon for stiffness/weight, but if I can achieve the same with alloy rims for less $, that's even better - more money for light cranks! I've never ridden either the old Crests or the new MK3 ones, but the old ones had a reputation for being flexy. Stans claim the new rims have an improved stiffness, but is it enough? I can't find any ride reviews on them yet. I'm 158lbs, so not super heavy, but I suck at picking lines and often ride over larger rocks than I should Still, Crest MK3s built on the lighter Novatec hubs should make for a ~1400g wheelset, which would indeed rival the lightest Chinese options from Farsports and LB for a couple hundred $ less.

Hello all, another new guy here from Arizona.

I'm primarily a roadie, but getting into endurance/marathon MTB races and interested in building a light 29er HT for that purpose. I currently ride a 2010 Rocky Mountain Vertex 29er, which seems strong and reliable, but is a bit too heavy at 26.5lbs...and that's after putting it on a mild diet of of 1x10 drivetrain and some lighter cockpit. Of course, the 6lbs or so that it has on a nice carbon build is only about 3% of the rider/bike system, but the weight weenie in me is not easily persuaded by that kind of math

Hoping to use the accumulated knowledge in this forum to pick out a frame and wheels for the build. I'd love to end up in the vicinity of 20lbs in size XL with a suspension fork and a carbon wheelset, but understand that may be a bit of a stretch. I'm currently looking at all the usual suspects - 057, 041 and 062 as frame candidates.

Thanks, carbonazza.
So enough people had successful experiences with 041 by now?
I see your point on 062 being twitchier, with it's shorter chainstays.

I'm a 6'3" rider that's all legs, so I'm trying to find a frame with a fairly high stack number to minimize the headset spacers I'm running with a saddle-bar drop that's comfortable over long rides (5+ hours...will be a marathon XC bike).
It looks like the LCM903 or 904 may work in that regard. They have a shorter reach than the 062.
Does anyone have stack/reach numbers for the 052 frame? They don't have it in the table on the XMCS website.