Home > Bike Types > Gravel Bikes

Wild new Specialized Diverge suspends the rider with fully damped rear Future Shock

specialized diverge str w-works
27
Support us! Bikerumor may earn a small commission from affiliate links in this article. Learn More

The 2023 Specialized Diverge STR gravel bike adds a unique rear Future Shock seat tube with a hydraulic top tube motion damper to control the flex. Combined with their steer tube Future Shock up front, the bike keeps the rider floating over chatter for a smoother, faster ride.

The design is wild, leveraging almost the entire length of the seat tube (not seat post, but seat tube) to provide flex, giving it a lot of travel. Here’s everything you need to know about the new Diverge…

What’s new? What’s the same?

closeup details of specialized diverge str gravel bike with future shock suspension

The Specialized Diverge STR will sit at the top of their gravel bike lineup alongside the Crux S-Works, just with a very different rider in mind. The Crux will remain their lightest, race-focused bike, but the Diverge STR will likely be the bike of choice for their pros on rougher courses.

2023 specialized diverge geometry chart

The standard Diverge design, without the rear Future Shock, will remain in the lineup, too. In fact, the new STR model shares the almost the same geometry, with a few subtle tweaks:

  • Stack & Reach are identical
  • STR BB drop is 85mm, 5mm more than standard
  • Chainstay length is 429mm, 4mm longer than standard
  • Seat tube angle is 0.5º steeper, but…

closeup details of specialized diverge str gravel bike with future shock suspension

…the slightly steeper seat angle is offset once you sit on it and the system is sagged, making the effective seat angle the same as the standard Diverge once your weight is on it. Specialized suggests sliding your saddle 5-10mm more forward to account for the sagged flex, putting you in the same position as on a fully rigid bike.

closeup details of specialized diverge str gravel bike with future shock suspension

Tire clearance is 700×47 (or 650Bx2.1″), and downtube SWAT storage comes standard with included tool bags (fill it with whatever you want, or stuff a rain jacket in there).

How much does the Diverge STR weigh?

closeup details of specialized diverge str gravel bike with future shock suspension

An S-Works Diverge STR frame weight is just 1,100g (claimed, FACT 11R frame, size 56, painted with no hardware, and without damper…keep reading), about 100g more than a standard S-Works Diverge frame.

And it’s a “rigid” frame, which was the point. Specialized wanted to maximize power transfer and overall efficiency, so the bike handles like a normal rigid bike. Stand up and the rear Future Shock does nothing, turning your arms and legs into the suspension. Thankfully the front Future Shock still delivers its 20mm of travel, standing or sitting.

closeup details of specialized diverge str gravel bike with future shock suspension

All in with the full rear Future Shock system, an STR frame will weigh almost 400g more than a standard frame, but that includes the headset, SWAT system, and hardware.

A complete 56cm S-Works Diverge STR weights 8.5kg (18.75lb) setup tubeless, out of the box. A Pro model weighs 8.9kg (19.6lb), and an Expert model weighs 9.5kg (20.9lb).

How does the Diverge STR rear Future Shock work?

closeup details of specialized diverge str gravel bike with future shock suspension

To be clear, this is not a “full suspension” bike in the traditional sense. The goal is to suspend the rider so they can remain seated, comfortably, and power through chunky courses without wasting energy hovering over the saddle or bouncing around.

Specialized has been working on how to do this since at least 2017. Recent versions of the Roubaix and standard Diverge dropped the seatpost clamp lower to give the seatpost more room to flex. That was fine for endurance road bikes, where you may race on cobbles occasionally. But gravel bikes were taking on ever more challenging terrain.

Clockwise from top left in the image above are prototypes starting with an eccentric bottom bracket that allowed an inner shaft to move inline with the seat tube. From there, they moved to a vertically suspended seatpost with a rear air shock connected to the bottom bracket, keeping effective saddle height unchanged even as the rider “felt some suspension.

Both of those early designs worked-ish, but would be far too complicated to manufacture at scale. Eventually, they moved to the extended flexible seatpost concept, which was simpler and provided the desired benefits while maximizing stiffness and minimizing weight.

clear frame cutaway view of specialized future shock front and rear on new diverge str frame

The rear Future Shock provides up to 30mm of travel by using what is effectively a really long seat post anchored very low in the frame that’s unattached to the top tube or seat stays.

There are, actually, two seat tubes on the frame. The external one you see, and a separate internal carbon-and-glass fiber tube that bolts into the frame just above the bottom bracket. That attachment point acts as the pivot, allowing the entire tube, and the seatpost inserted into it, to act like a leaf spring.

The external seat tube is ovalized near its top, creating room for the internal tube to flex rearward.

inner seat tubes closeup details on new specialized diverge str

Specialized will offer 9 different seat tubes, and each of those has two distinct flex characteristics thanks to different layups and material combinations, providing 18 total “tunes” to work for almost any rider weight.

Each bike will come with two tubes covering the expected range of rider weights for that frame size, in total covering riders from 110lbs to 275lbs. (The bike has a total rider+cargo weight limit of 275lbs)

Here’s the catch: A really long carbon leaf spring could flex a lot, and then rebound quite forcefully, bucking the rider. So it needed to be controlled, and that’s where the hydraulic damper comes in.

seat tube damper closeup details on new specialized diverge str

Essentially the same as the damping circuit found in a suspension fork or shock, the STR damper has separate compression and rebound circuits.

The compression (which, in this case handles the extension of the “shock”) has a three position adjustment – open, medium, and firm. This controls the motion, preventing it from catapulting you forward on every rebound, and eliminating any “bobbing” that could occur from an undamped system.

The rebound is adjustable with a hex wrench through a port under the top tube, making the system fully adjustable.

How do I adjust the Future Shock seat tube suspension?

inner seat tubes closeup details on new specialized diverge str

Each internal post has two effective layups, with a clocking groove that keeps it aligned. Simply rotate it 90º to switch the stiffness. The posts are clearly marked with numbers.

The higher the number, the stiffer the post, and it’s a linear progression. Meaning, a post marked “60” is twice as stiff as a post marked “30”. Or, a 30 post will flex twice as much as a 60 post.

The numbers indicate their flex as measured in N/mm, which, honestly, means nothing in terms of which post you should choose…but, you know, fun fact?

Specialized says the two posts included with each bike should make most riders happy, giving them four distinct options. They also say most riders can tell a noticeable difference with a 10% change (ex. going from a 40 to a 44 post), and that a 20% change is very noticeable. Combine those with the three compression damping settings and it makes it easy to fine tune for anyone’s preference.

closeup details of specialized diverge str gravel bike with future shock suspension

The damper connects to the post with an alloy “tendon”, and it has a wrench faces to hold it level when unbolting it so that you don’t bend and damage it when swapping posts.

But you only need to loosen it to swap internal posts; your actual seatpost can be adjusted and removed like normal. And it uses a normal 27.2 seatpost, so you can use any post you like, even switching to an alloy post if you want to reduce overall flex.

What about frame bags, racks & fenders?

closeup details of specialized diverge str gravel bike with future shock suspension

The fork has three mounts, letting you run accessory cages or a lowrider rack, and fender mounts. The rear, though, has no mounts for either rack or fender.

closeup details of specialized diverge str gravel bike with future shock suspension

Top tube bag mounts come standard, and strap-on frame bags can be used as long as they don’t interfere with the damper or rub the rubber boot around the seat tube. Saddle packs and bags can be used like normal, but if it’s heavy you may want to use a stiffer post.

2023 Specialized Diverge STR prices & options

closeup details of specialized diverge str gravel bike with future shock suspension

All models use a threaded bottom bracket, flat mount brakes and thru axles with full internal routing…for brake hoses and wires, it’s designed only for electronic shifting groups. You’ll notice only SRAM builds here, however you should still be able to build a bike with Shimano Di2 since the inner seat tube is hollow and would allow the battery wires to pass through to the seatpost battery.

An S-Works frameset ($6,000), including fork with Future Shock steerer is available if you’d like to do just that. A small wire entry port sits under the rear brake hose entry at the head tube, and there’s an exit port just above the rear dropout.

As for dropper seatposts, there are no mechanical routing options, but you could install a Reverb AXS post. The frame is 1x only, so you won’t be giving up front derailleur compatibility to add the wireless dropper.

All bikes get Supacaz Super Sticky Kush handlebar tape, which is awesome.

specialized diverge str s-works

2023 Specialized S-Works Diverge STR

The S-Works model gets the top of the line FACT 11R carbon frameset. MSRP is $14,000 (€15,000 / £13,000). Spec highlights include:

  • SRAM Red eTap AXS shifters, Quarq power-meter crankset, brakes
  • SRAM Eagle XX1 derailleur, 10-50 cassette, chain
  • Roval Terra CLX wheels w/ Roval LFD hub & ceramic bearings
  • Roval Terra carbon handlebar
  • Tracer Pro 700×42 tires
  • Body Geometry S-Works Power carbon saddle
  • S-Works carbon seatpost
  • Satin Forest Green/Dark Moss fade

It’s worth noting that this is the first complete bike that’ll ship with the 3D-printed S-Works Power saddle, and that these Roval Terra CLX wheels are new, too.

They combine the already light Terra rims with the lighter LFD hubs from the Alpinist CLX II road wheels, which uses a DT 180 Ratchet EXP 36T internal (10º engagement) and SINC ceramic bearings. They’re light, but will have their own official launch with all the tech details in the near future.

specialized diverge str pro in satin blaze pink

2023 Specialized Diverge STR Pro

The Diverge STR Pro comes in a bright Satin Blaze/Violet Ghost Pearl color and retails for $9,500 (€9,500 / £9,000). Spec highlights are:

  • SRAM Force eTap AXS shifters, crankset, brakes
  • SRAM Eagle X01 derailleur, 10-50 cassette, chain
  • Roval Terra CL wheels w/ DT350 hub
  • Roval Terra carbon handlebar
  • Tracer Pro 700×42 tires
  • Body Geometry Power Pro saddle with ti rails
  • S-Works carbon seatpost

specialized diverge str expert in black

2023 Specialized Diverge STR Expert

The Diverge STR Expert downgrades to standard FACT carbon and retails for $7,500 (€7,500 / £7,500). Spec highlights are:

  • SRAM Rival eTap AXS crankset, shifters & brakes
  • SRAM GX Eagle AXS derailleur, cassette & chain
  • Roval Terra C wheels w/ new DT 370 Star Ratchet hub
  • Specialized Adventure Gear Hover alloy handlebar
  • S-Works carbon seatpost
  • Tracer Pro 700×42 tires
  • Body Geometry Power Expert saddle with ti rails

specialized diverge str expert in harvest gold

The Diverge STR Expert comes in two colors – Satin Black/Diamond Dust, and Satin Harvest Gold/Gold Ghost.

Framesets are only available in the US and Australia ($8,500 AUD), and Australia only gets the Expert complete bike ($10,500 AUD).

Stay tuned, we’ve been riding one and will post the review soon…

Specialized.com

Subscribe
Notify of
guest

This site uses Akismet to reduce spam. Learn how your comment data is processed.

27 Comments
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
Daniel Torres
Daniel Torres
3 months ago

Trying to read this would be a lot more enjoyable if I didn’t have Apple Watch ads shoved down my throat every other paragraph.

Billy
Billy
3 months ago
Reply to  Daniel Torres

Sure but are you paying anything for the content? I think it’s fantastic, proliferation of ads notwithstanding.

asdffdsa
asdffdsa
3 months ago
Reply to  Billy

here are some ads while reading an ad, enjoy.

Deputy Dawg
Deputy Dawg
3 months ago
Reply to  Billy

Fine with the ads. Hell, I even click on them occasionally.

BUT NOT IMMOVABLE ADS THAT ACTUALLY OVERLAY THE CONTENT AND CANNOT BE DISMISSED, PLEASE!

Zach Overholt
Admin
3 months ago
Reply to  Deputy Dawg

We hear you. We don’t want those either. We’re constantly working on improvements to the site and have some big things in the works. In the mean time, thanks for reading!

n8sters
n8sters
3 months ago

I kinda love it????? I have a Trek Supercaliber that I use as rough terrain gravel-ish bikepacking rig when my Salsa Cutthroat isn’t up to the task, but if I had to trade both in for one bike this would be an interesting proposition. I really disliked the Niner MCR, but this looks kinda cool!

Russ Greway
Russ Greway
3 months ago

I just can’t…cannot get over that this is the final version of this design. SMH.

Exodux
3 months ago

I really tried to like this bike(no I haven’t ridden it) and I’m sure it will be a great bike for some gravel races in which most of the top guys are riding fully rigid bikes. But for the rest of us, why can’t someone come out with a gravel bike with something like 50-60mm of travel? Every gravel event I’ve participated in, and pretty much every one of my gravel rides I do, a bike with more travel would be a benefit.
My current bike uses a RS Rudy fork with 30mm of travel and a Canyon VLCS seatpost. A gravel version of the Trek SuperCaliper would be ideal!

joe
joe
3 months ago
Reply to  Exodux

Trek Procal, reduced travel fork, drop bars, Force or Rival AXS. You’re welcome

Raouligan
Raouligan
3 months ago

Stop me if I’m wrong isn’t this basically a Slingshot but upside downwind back to front?

Richard Anderson
Richard Anderson
3 months ago

I have a trek pro-caliber and the amount of energy that is saved by the seat post moving forward and aft is minimal compared to a bike with rear suspension that travels vertically.

Seraph
Seraph
3 months ago

This is more like the SuperCaliber, since there is an actual damper involved.

TheKaiser
TheKaiser
3 months ago
Reply to  Seraph

You’re correct that this bike is like the SuperCal in them both having a proper damper, but the SuperCal is actually suspending the wheel, whereas this bike is suspending the rider, which is a design more akin to the ProCal. I suppose it is a matter of opinion, but I would consider the suspension movement type to be a bigger definer of the fundamental design of a bike than the presence of a formal oil damper, but that’s just me.

dontcoast
dontcoast
3 months ago

It’s a Domane with a Damper lol

GFeldy
GFeldy
3 months ago

Didn’t gravel worlds just show everyone that gravel bikes are dead?

WhateverBikes
3 months ago
Reply to  GFeldy

No, it just showed the course was kinda lame, and modern road bikes have become more versatile.

Mr. P
3 months ago
Reply to  GFeldy

And Unbound is a 200 mile time trial where bike with aero bars win. Why are the “official” top gravel events strangling the soul of gravel?

blahblahblah
blahblahblah
3 months ago

the perfect bike to survive Australian cycle paths coz gravel aint got nothing on these man made horrors

Mr. P
3 months ago

Why so complicated? And only works when sitting down? This is really complicated for a partial solution to a simple problem.

Theologian
Theologian
3 months ago

I wonder how this ride compares with GT Grade, which is basically the hardtail version of the same principle, but simpler, lighter, and cheaper.

PaulC
PaulC
3 months ago

I’ll save myself some money and just purchase an old 1990s full suspension MTB. Basically all that gravel is is early 90s mountain biking.

Mitch
Mitch
3 months ago
Reply to  PaulC

Such a brave, bold, and unique point of view! The world thanks you for this one in a trillion perspective.

smw
smw
3 months ago

why such a fuss in tech – buy a cheap full sus mtb and drop bar it – best of both worlds and a bucket load more travel

tech9
3 months ago
Reply to  smw

hahahah “cheap” and “full-suspension” should never be used in the same sentence.

Dylan
Dylan
3 months ago
Reply to  smw

I agree in principle, but in practice converting an MTB to drop bars is harder than it should be. I’m in the midst of doing this, and there’s a reason why I’ve thought about it for over a decade before finally saying “what the hell” and getting on with it. Firstly, just about every MTB has post-mounts for the brakes, while every road hydraulic shifter uses flat mount calipers. Sure, you can swap the calipers over on the hose, but it’s still extra cost. Best solution is probably to look for an old Rival 2×11 groupset with post mount brakes, but even so you’ll quite likely find that the hoses aren’t long enough to reach the calipers, so factor in new hose anyway. Secondly, the cable pull is different between road and MTB groups, so you either need to swap to a road derailleur or find the right cable pull adapter. Plus your MTB will have come with a 10-50T cassette that you will likely want to swap out for a 10-42 (both for ratios and because your road derailleur won’t cover that range).

Shafty
Shafty
3 months ago

Here’s another suspension design that locks you into dealer service. They can’t get you to come back any other way. How many years until it can’t be serviced and no one can buy parts? $6k for this frame? How much of that covers the cost of your eventual warranty?

bmwt
bmwt
3 months ago

Mentally trying to solve the price of these by an aluminum executed frame. Still over-priced. Likely more quick-to-go obsolete. So the sky high price is the correct move. Thanks Specialized and ultra-wealthy you saved me from any continued interest.

Subscribe Now

Sign up to receive BikeRumor content direct to your inbox.

Subscribe Now

Sign up to receive BikeRumor content direct to your inbox.