As I posted in October of last year when we had this discussion one time before:
The XTR (39 mm) and new XT (41 mm) ones are different. Old BB diameter was 44 mm. So 3 different ones needed.
This is what's wrong with The Industry™
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The XTR (39 mm) and new XT (41 mm) ones are different. Old BB diameter was 44 mm. So 3 different ones needed.
according to park tool, XTR/Dura-Ace and XT/Ultegra are different sizes, and both are different than the original hollowtech II external BB
[edit] https://www.parktool.com/blog/repair-help/bottom-bracket-tool-selection-threaded-and-thread-together [/edit]
this also jives with what Abbey has posted for their BB sockets:
funny enough my search turned up an article in my local paper from 2015, which means I probably read about this before! ha
Illegal bike trails and a Forest Service crackdown divide a town
A biking boom in Sedona, Arizona, forces locals to ask: Is there room for all these people?
Thanks for the update. I do like hollowtech II very much. I guess/hope they're still producing them, so we're cool w/ that for a while yet.
for the current iterations of their drivetrains, only Saint, Zee, and Deore still use hollowtech II. SLX doesn't have its own BB and uses XT.
Poopdecking much?
gary needed pictures.Poopdecking much?
ftfy
Well that's nonsense bullshit. Didn't realize they'd made the road BB's needlessly different from the MTB's.
If only someone else had pointed this out earlier.
its not road, its by tier. XTR / Dura-ace are one size, xt / ultegra are another.
That's even dumber.
Now I need to go and check my remaining pile of those adapters because I've definitely ordered XTR and XT versions before.
This is my new method. I got a nice locking one and who the F gives a **** about the BB splines?
Naw, too rounded.These will work moar better and really screw up those splines;
Crank her down and give it the beans
This is what I'm using, the angles will really dig into that soft aluminum like butter and like god intended.
I got the plastic adaptor so I could use my BB spanner, less than ideal and already starting to die. It was cheap and feels like a 3D print.
I’ve had a bad run of burning through non-drive side bearings, getting about 6 months. A lot of bike washing due to all the muddy UK rides. These are mainly the previous gen XT BBs. I haven’t run the new XT BB for long enough to see if it lasts longer. Just got one of the older gen BBs cheap to go in the spare box, so still see myself switching between the 2 options.
So it looks like I need to get one of those Spanner’s from toodlestools.com
I’ve had a bad run of burning through non-drive side bearings, getting about 6 months. A lot of bike washing due to all the muddy UK rides. These are mainly the previous gen XT BBs. I haven’t run the new XT BB for long enough to see if it lasts longer. Just got one of the older gen BBs cheap to go in the spare box, so still see myself switching between the 2 options.
So it looks like I need to get one of those Spanner’s from toodlestools.com
Regarding the new spline interface for the Shimano XT BB (BB-MT800), it matches the splines of the direct mount chainring lockring for the new crankset (FC-M81XX-1). I think it's better to buy the ParkTool LRT-4.
You can use the LRT-4 for the lockring and BB, but you can't mount the lockring with the BBT59.2.
You can use the LRT-4 for the lockring and BB, but you can't mount the lockring with the BBT59.2.
When did Maxxis change the Exo+ from 120tpi with silkshield to 60tpi with a heavier exo layer? I guess I'm just a little slow, but I do not remember this. I have an original Exo+ and I liked it better than the same thing in Exo when doing a back to back. Thought it had a better feel. I need new shoes for the trailbike and I looked and both Assegai and Dissector are both showing as 60tpi. The only 120 is DD.
Old
New
Old
New
Hmm...Didn't realize that. And I consider myself a Maxxis nerd.
To be fair, I've just been buying what has a discount price. These days, I'm just sticking to Minion or DHR in DH or EXO. The DH casing goes on the back, EXO on the front. If I have to go EXO on the rear, then CushCore gets involved. All depending. But right now, there's too much snow/ice/mud to really go full speed, so no real need for DH casing.
These crazy days, I just buy what I can get and know and love and hopefully not pay full retail
That sucks. The knock on EXO has always been that the middle of the tread is just a XC casing and gets punctures. EXO+ fixed that with an option for people who didn't need the thicker DD casing.
to be honest, anyone riding their bike at all the way it's meant to be ridden, unless it's a pure xc bike ridden somewhere with no rox, probably would be best served by doubledown. i know for me it's been one of the most set it and forget it things i've ever done, along with xt cranks and hope/ex471 wheels.
I don't think the EXO is bad, but it depends on several factors and they aren't the tire to go ripping down a typical "black" trail and when they start doing stuff like EXO, EXO+, DD and DH...it seems more like it's just getting ridiculous for splitting hairs. You can't really choose your usage "that" finely IMO.
Disagree - you totally can, I'm with @Lelandjt and currently use the EXO+ front with DD rear on my compromise-duro bike.
Big fan of Schwalbe's SuperGravity casings for DH, if anything I think EXO+, DD, and SG are some of the most useful introductions in MTB rubber tech. Most people don't need full DH casings with dead-weight wire beads, and everything EXO and thinner/lighter is useless for decent riding.
This is interesting. I jumped on the EXO+ w inserts bandwagon last year, and it didn't work out for me. While I didn't pick up any pinch flats, I managed to puncture the casing at the tread a few times. My conclusion was that the 120tpi casing is very supple and thin, and not as robust as I needed.
This is why I switched to a Specialized Butcher Grid Trail T7. Similar construction to the EXO+, but uses a 60tpi casing (or maybe it's a 50tpi - I'm not 100% certain).
@mykel, I still have a couple of new, unmounted 27.5 2.4 DHR2 in the "old" EXO+... I think we're both in Ontario. If you're interested, I'd be willing to sell them...
Thank-you for the offer.
Unfortunately(?), the trailbike is Wagon-wheeled, so a nogo.
Cheers!
This is my set up as well. Obviously this is one of those things that depends on your weight, riding style, appetite for faffing, etc. The trick is finding a good mix of durability, weight, and ease of use, and this works pretty well for me and my hacktastic 195 lb carcass. With Exo+ front and DD rear I actually wear out tires rather than shred them.
Trail bike ride = high speed + lots of rocks?
Yes = DD
No = EXO+
Run two sets of wheels and swap based on the answer above.
Yes = DD
No = EXO+
Run two sets of wheels and swap based on the answer above.
I can get away with DD in the rear and an EXO Assegai in front... however I was planning to try the EXO+ Assguy next purely for increased puncture protection on the tread. 
The EXO+ Assegai is worth it over the EXO because you can get it in MG.I can get away with DD in the rear and an EXO Assegai in front... however I was planning to try the EXO+ Assguy next purely for increased puncture protection on the tread.