SRAM DUB XO1 Eagle – Unboxed and Actual Weights

The new SRAM DUB crankset platform launched in early January, it promised to bring their lightest mountain bike cranksets to date, and the end of figuring out which crankset will fit which frame and BB. The design uses a 28.99mm spindle for all BB variants, and they’ll offer the common BB standards to fit around it. This means no matter your frame, you simply get the correct BB and these cranks will fit. No more worrying about BB30, BB386, GXP, etc. But, really, they could have stopped at “lightest” and we’d still have been hooked…

2018 SRAM DUB XO1 Eagle actual weights and tech details

Our test set just arrived, and as tempted as I was to request the even lighter XX1 Eagle DUB set, we’ve already put XX1 Eagle and GX Eagle to the test, so it was time for the middle child XO1 to get its chance. Our group arrived with 175mm arms and a 32-tooth X-Sync chainring installed.

2018 SRAM DUB XO1 Eagle spindle diameter measurement photo

The claimed 28.99mm spindle gives them an extra 0.5mm per side. That doesn’t sound like a lot, but think about the PF86 BB and how small those bearings need to be to fit a 30mm spindle inside them. Smaller balls mean they’re spinning way faster, the races are much narrower, and the whole system is way more prone to damage from minor contamination.

So, the seemingly marginal gains from 0.5mm larger bearings don’t seem to marginal when you do the math. Using BBinfinite’s PF86-to-30 6706 bearing size of 2.0mm as an example, adding 0.5mm to the diameter is a 25% improvement.

Is that why SRAM did it? And did they do that here? Or are they just trying to block aftermarket stuff for a while. We’ll ask them in person at Sea Otter. For now, this will be going into our next project bike, an XC race hardtail, which we’ll be documenting soon. Stay tuned. Now, back to DUB.

2018 SRAM DUB XO1 Eagle pressfit bottom bracket

SRAM will offer four DUB bottom bracket options: BB30, PFBB30, BSA and PFBB (tested).

SRAM DUB ACTUAL WEIGHTS

2018 SRAM DUB XO1 Eagle actual weights and tech details

On our scale, the individual parts weigh in at:

  • driveside crank w/ 32-tooth chainring: 249g
  • non-drive crank arm w/ spindle: 232g
  • PFBB bottom bracket: 68g
  • XO1 Eagle 10-50 cassette: 354g

2018 SRAM DUB XO1 Eagle actual weights and tech details

  • XO1 Eagle shifter: 125g
  • XO1 Eagle rear derailleur: 280g
  • Eagle 12-speed chain: 264g

2018 SRAM DUB XO1 Eagle actual weights for complete crankset with bottom bracket and 32-tooth X-Sync chainring

Altogether now, the crankset with BB weighs in at 550g, which is 53g heavier than the XX1 Eagle DUB with BB we had on the scale in our launch coverage. Total system weight with parts shown here is 1,573g. For comparison, the original XX1 Eagle with BB30 spindle/PFBB came in at 1,565 for the same parts. A visual comparison of the new XO1 Eagle DUB cranks and the original XX1 Eagle cranks reveal no exterior differences in shape, suggesting the additional weight savings is coming from layup and internal parts…and the new spindle.

The takeaway? The XO1 group is now basically as light as XX1 was. Hooray for trickle down!

2018 SRAM DUB XO1 Eagle actual weights and tech details

Watch for these parts on our Project XC Race Bike starting next week, which will be heading to the True Grit Epic on March 10 for a real test.

SRAM.com

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D-con
D-con
4 years ago

Maybe you could get something with a broadly supported 30mm spindle instead. Maybe that something would be made in Canada with all of the environmental and labour protection that entails. And maybe it would be comparably priced.

Then again maybe not.

dhorvath
4 years ago
Reply to  D-con

Maybe these bearings will last longer than RF. Not holding my breath mind, but it would be nice.

D-con
D-con
4 years ago
Reply to  dhorvath

I’d choose a readily available BB over a hypothetically and marginally better .5mm from one supplier any day.

Thanks to Eagle-enabled OEM strong-arming, these freaking things will be everywhere before long. At least the graphics will keep aftermarket demand in check.

Thanks SRAM.

Will
Will
4 years ago
Reply to  dhorvath

Just get a wheelsmfg bb if you don’t like rf….

Flatbiller
Flatbiller
4 years ago
Reply to  D-con

I’ve only ever had two issues with cranks falling apart. Both of those were Next G4 SLs. Both were bonding issues: one with the pedal thread, the other the driveside spindle mount.

Praxis Lyfts are my new go-tos. But I will give this DUB a try when I build up a new bike this summer.

Tom in MN
Tom in MN
4 years ago

Small ball bearings is another reason not to put up with PF BBs, I don’t believe external BSA has a similar restriction.

Alex
Alex
4 years ago

One thing that drove me nuts about SRAM is how they moved their Quarqs from the 3 bolt standard to 8 bolt. Fine, you changed it, it’s better for power reading. I get that. But what drives me nuts is that they didn’t move the rest of their arms to this new standard and only made the “DPrime” ones with 8 bolt. SRAM charges way too much at $400 for new Quarq carbon arms, a ripoff.

That being said, is the new DUB platform 8 bolt or 3 bolt?

Jacob
Jacob
4 years ago
Reply to  Alex

It’s a 3 bolt. Otherwise all of their current DM rings wouldn’t be compatible

Cheese
Cheese
4 years ago
Reply to  Jacob

But they could easily put eight threads in the cranks and only mount three screws when using standard rings, no?

Tyler Denniston
Tyler Denniston
4 years ago
Reply to  Alex

3-Bolt

Dexter
Dexter
4 years ago

That 0.01 mm is direct humiliation to all the customers intelligence.

Brad Comis (@BradComis)
Reply to  Dexter

No really eh. Just call the dang thing what it is: A 29mm ID bearing! 28.99-29.01mm is the tolerance SKF lists for their bearings in this size range.

Dexter
Dexter
4 years ago
Reply to  Dexter

Obviously you do not know what tolerance is.

Nigel
Nigel
4 years ago

Were the batteries flat in your vernier caliper?

Or did they not read 28.99?

Matthew T LaPrade
Matthew T LaPrade
4 years ago

The X01 cranks are foam filled and XX1 is carbon, thats where the weight difference lies.

blah blah blah
blah blah blah
4 years ago

no one wants press fit bb, what part of that don’t these people get ffs! just stop please!

Seraph
Seraph
4 years ago
Reply to  blah blah blah

Actually press-fit works great if you install it correctly the first time. I’ve got Easton cranks on my Scott Addict Gravel and I use Rotor’s press-in BB86/92 30mm ID system with great results.

Matt
Matt
4 years ago
Reply to  Seraph

Unfortunately, 98% of bike shops, even really good ones, do not have the technical and experience to install them correctly the first time.

blah blah blah
blah blah blah
4 years ago
Reply to  Seraph

“if, correctly, first time” see there is the 1 of the problems, Bsa screw it in, done enjoy no phd required

duder
duder
4 years ago

I guess I’m a hack, but I whack my cranks on a lot of rocks, and I prefer to stick with alloy. Will Sram have any high-quality alloy cranks available with DUB?

Brian
Brian
4 years ago
Reply to  duder

The GX version is out in aluminum with dub.

Carl
Carl
4 years ago

“SRAM will offer four DUB bottom bracket options: BB30, PFBB30, BSA and PFBB…”
That’s gonna get annoying fast in the shop. Yo, Fred needs a new BB. Yeah PF30. No, DUB PF30!

mateo
mateo
4 years ago
Reply to  Carl

As opposed to the current state of affairs in BB/crank interfaces?

BSA/T46/PF92/PF30/BB30/BB90 just on the shell side.

GXP/HTII/24mm/30mm narrow/30mm wide on the crank side.

This move actually reduces the SKU count for cranks (only DUB vs BB30 and GXP). The cost of carrying a few extra BBs is nothing compared to the savings from not having to stock multiple versions of cranks that cost a few hundred each.

Epic throatbeard
Epic throatbeard
4 years ago

Generic complaint about something changing to make it better or lighter! Random comment about something I used to own that worked flawlessly for 15 years! Sly innuendo implying I’ve been at this longer than you have. Blah blah press-fit BB’s, I heard about one that caught on fire and killed a girl! I’m not against changing things but I hate it when they change things.

Tim
Tim
4 years ago

Um… There is a pretty solid group of people who’ve had real problems with PF.

Jason Miles
4 years ago

Can you cut a BB in half? I would love to see a cross section of their improved sealing design.

Jon
Jon
4 years ago

Correct me if I’m wrong but isn’t the extra 1mm used for sealing while the actual bearing remains 30mm ID? If not it mean completely custom bearings at I don’t think 29mm ID is a stock size. It that’s the case there would be no ball size improvement.

neil
neil
4 years ago

i had a look in person at them and the bearings are still 30mm ID and exactly the same as they always have been. the difference is……

they have put a plastic seal/spacer/shim in to get the axle down to 29mm just like shimano does to take a 25mm bearing down to 24mm axle. the reason?? well when the bearing seize it wears out your cranks and SRAM have probblay got sick of replacing them under warranty so this bit of plastic copied off shimano et al solves the issue.

2 steps back and one forward and all that. its hardly revolutionary!

Jon
Jon
4 years ago
Reply to  neil

So no improvement to ball size. Just sealing…

satanas
satanas
4 years ago

And presumably there will be no Q156 cranks in DUB if it’s meant to “fit everything.” 🙁

Nick Aughtry
Nick Aughtry
3 years ago

$1 per gram