With SRAM launching the first 12-speed mountain bike groupset, how long will it be until we see another sprocket on road bikes?

If you’re more at home on the tarmac than the trail, then you might not have taken much interest in the launch of SRAM’s new mountain bike groupset. But for 2017, the American company has added a 12th sprocket to its XX1 and X01 groupsets, which got us thinking, could we soon see 12-speed road groupsets?

In mountain biking, the jump from 11-speed to 12-speed has been very quick with SRAM being the first to bring 11-speed to market with its XX1 groupset in 2012. Contrast this with road groupsets, which were first taken up to 11-speed by Campagnolo in 2008. Indeed, Campagnolo has released three versions of its top-end Super Record groupset since then, none of which have been 12-speed, while the new Shimano Dura-Ace which we expect to be released at some point this year looks like it will also stick with 11 sprockets.

>>> Buyer’s guide to road bike groupsets (video)

So with two of the big three sticking steadfastly with 11-speed, and SRAM already possessing the technology to produce 12-speed cassettes and derailleurs, it will be the American company that will be at the forefront of road groupset development.

sram eagle 12-speed mountain bike groupset cassette

SRAM has become the first company to bring 12-speed to mountain bike groupsets

SRAM has a history of taking mountain bike technology and moving it across to its road groupsets, most recently with its 1x single chainring groupsets. This was originally rolled out into its mid-range Force and Rival groupsets, but has since been added to the entry-level Apex groupset. Surely the trend is only going to continue to the top of the SRAM road range with a 1x Red groupset.

>>> Are you using your bike’s gears efficiently?

If SRAM is committed to pursuing single chainring groupsets on road bikes, then having a 12-speed cassette makes complete sense.

One of the problems we’ve found with SRAM 1x is that if you want to have the range of gearing that will allow you to tackle steep climbs and fast descents, then you will usually be left with big gaps between gears, meaning that you can struggle to find the perfect gear to maintain a comfortable cadence. Having a 12-speed cassette will certainly go some way to solving this problem, reducing the jumps between gears without reducing the gearing range.

Watch: buyer’s guide to road bike groupsets

Before today, this was pure speculation, but now that we know that SRAM possesses the technology to bring 12-speed 1x groupsets, it can’t be long before we see the extra sprocket making its way across to road bikes. Unfortunately SRAM was unable to provide comment when we got in contact.

But what of Shimano and Campagnolo? Surely companies that have been making road bike components for 95 and 86 years respectively would be looking to the future and developing 12-speed groupsets?

>>> SRAM Red eTap vs Shimano Di2: which is better?

Shimano has told us that it has explored the possibility of producing a 12-speed groupset. In fact, the Japanese company told us in January that it had tested 12-speed gears and that production was possible, but wasn’t planning on releasing anything until it had complete confidence in the system.

We’ve contacted Campagnolo to ask whether it is working on a 12-speed groupset but have yet to receive a reply. The Italian company has just released a new mid-range Potenza groupset (which was 11-speed), but has also taken pride at being ahead of the curve with road component innovation, so we’re sure it must have something up its sleeve.

Do we need 12-speed gears?

Over the past three decades the number of sprockets on a bicycle cassette has grown from six, to seven, to eight, nine, 10 and now 11. So will we have 12-speed gears any time soon?

The advantages of having more cogs in your cassette are relatively obvious: you can have a wider-ranging selection of gears, meaning less shifting on the front chainrings, and you can have less of a jump between the gears on the cassette to ensure a smooth pedalling cadence as the terrain changes.

>>> Is it the end for the 34t chainring?

Already, the introduction of 11-speed cassettes has all but killed off the need for triple chainsets, which were introduced to provide lower gears. Now it is common to find cassettes fitted on road bikes that go as low as 32-teeth, coupled with a 34-tooth inner chainring. And you can still have a 50t chainring and 11t highest gear at the back for those fast descents.

Tour Down Under - Stage 2

We’ve seen electronic groupsets this year, but what about adding any extra gear?

Pros and cons

The disadvantages of increasing cassette size are perhaps slightly less obvious. Despite manufacturers reducing the physical width of the sprockets on the cassette, the gaps between them and the width of the chain, the width of the cassette has slowly crept up.

However, the distance between the dropouts on frames has not changed. The only way to accommodate the larger cassette is to ‘dish’ the rear wheel, so that the spokes on the drive side are shorter from the hub to the rim. This has certain strength implications; as you may remember from your school physics lessons the strongest shape is an isosceles triangle with equal angles at its base. Rim manufacturers have experimented with ways around this — some using offset spoke holes to reduce the effect of dishing.

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Having less of a gap between sprockets is a double-edged sword when it comes to shifting performance. Less of a gap means less leverage needed to ship the chain from one cog to another. But that also means that there is less tolerance to misaligned derailleurs, sticky cables and worn chains. Of course, this isn’t an issue with the new breed of electronic gears that auto-adjust themselves.

>>> Are electronic groupsets necessary?

Another drawback is that it’s tricky to upgrade. You cannot simply slap an 11-speed cassette on a 10-speed bike, and the same would be true of 11 to 12-speed. A new shifter and swap to a narrower, compatible chain and chainrings to achieve an efficient drivetrain.

Ultegra groupset: high-end kit that won’t miss a shift

With compact, semi-compact and standard chainsets available, do we need additional sprockets?

One on the back, one off the front?

Weight is also an issue — more sprockets means more metal. This weight gain has been largely negated over the years with the use of lighter materials, and careful drilling and machining of parts to lose mass, but in some instances this has had a negative effect on longevity.

>>> Shimano 105 groupset: longterm review

Bikes with two or more chainrings will have a crossover of gears: the lower selection of gears when in the large chainring is equivalent to the higher selection of gears in the small chainring. This is to give you a wide spread of gears no matter which chainring you are in.

SRAM has just introduced a 1×11 groupset designed for road bikes, having previously introduced them for the mountain bike and cyclo-cross markets. This single-ring set-up at the front has weight and mechanical benefits, both in terms of the missing ring and also the missing gear shifter and cable, although it can never replace the full range of gears in a double-ring set-up. Maybe this is where the appeal of a 12-speed cassette really comes in.

SRAM Force CX1

SRAM Force CX1: now available for road bikes

Our take

None of the big drivetrain manufacturers has a 12-speed system ready to go, as there are still gains to be made in honing the performance of current 11-speed set-ups and in further development of electronic gears. However, the prospect of ditching mechanically inefficient front chainring shifts in favour of a lightweight, wide-ranging 1×12 set-up is an enticing prospect for some applications.

Alex Dowsett

Alex Dowsett is a former Hour Record holder. Photo: Russ Ellis

For: Alex Dowsett, pro rider, Movistar

“12-speed would be welcome for a rider like me [heavy] in the mountain stages of a tour. Traditionally, I’ve had to sacrifice the 53 for a compact 52 or the 11 for a 29 to get the low end of the gearing range. I think manufacturers need to focus on making 11-speed 100 per cent reliable before they think about 12-speed — we’ve seen a few race-deciding mechanical issues this year. In short, I’m all for a bigger range of gears if reliability and weight isn’t compromised.”

Alex Dowsett, Tour of Britain 2014, stage seven

Alex Dowsett climbing Ditchling Beacon at the 2014 Tour of Britain. Photo: Andy Jones

Against: Joshua Riddle, Campagnolo

“With 22 gears to choose from, the metric development covered between the two chainrings is quite complete and with the ease of change between standard, semi-compact and compact chainrings, it should be quite easy for athletes to find the perfect gearing for nearly any course. Many factors come into play when speaking about adding more gears and perhaps with the ever-changing standards we see, rear-end spacing could allow such gearing in the future. Only time will tell.”

This article originally appeared in the April 30 issue of Cycling Weekly

  • You people talk like it HAS to be either 2×11 or, 1×11 or 1×12. All 3 can coexist just fine and can be useful for different situations and requirements. Personally, a 1×12 setup would be absolutely perfect for all my rides. If they made a 12-speed drop-bar shifter, my bike would already be running it.

  • Sebastián Peña

    So Shimano’s been making road bike components for 95 years? I personally thought that was just hilarious.

  • Samuel Clemens

    Heh, it’s the razorblade argument all over again. Or 7 minute abs…hey, how about 6 minute abs! Remember that one from ‘There’s Something About Mary’.

  • The Awakening


    It would all depend on whether it was a racing bike, or a touring bike that you had.

    A 42/52 chain ring combination would pretty much be standard.

    [1] For racing, the rear racing block, may have been;
    13, 14, 15, 16, 18 or,
    12, 13, 14, 15, 17.

    [2] For touring, the rear touring block, may have been;
    14, 16, 18, 20, 23 or,
    14, 17, 20, 24, 28.

    I am just giving you a sample of potential rear freewheel sprocket ratios, but I hope that you get the idea.

  • Ian Jackson

    What would the ratios have been on my old 5 speed and 10 speeds from the 70’s and early 80’s? Does anyone know?

  • The Awakening


    I use the old Campag chain sets, with 6 speed blocks. Why ‘hanker after’, the old kit. Sell this new stuff on eBay and buy the old kit back again.

  • The Awakening

    Most cyclists are now ‘sports cyclists’, they have no mudguards on their bikes and train on what I would call ‘thoroughbred racing bikes’.

    The world has changed, most cyclists having seen the cycling boom and have been a part of it, just go into a bike shop and get the newest kit in the shop. That new kit will in the ‘manufacturers vision’, be obsolete in FIVE years.

    You can’t stop what the manufacturers want to do. What you can personally do, is stop buying into their throw away vision… I have decided to stay at 126mm rear drop out with 6 speed and have bought old equipment, because it lasts longer.

    The way it is going, it will be 20-speed, then 30-speed, followed by 40-speed and continuing up to 50-speed. There still will be the ‘brain dead’, that want even more gears, after 50-speed… **Smiles**

  • Stevo

    Because it’s been at least a week since the last article on SRAM.

  • racyrich

    ‘This article originally appeared in the April 30 issue of Cycling Weekly’

    So why reprint it now, 11 months later?

  • David Bassett

    Where do you live???

  • Ray Faulkner

    I still hanker after the single chainring 5 speed freewheel of yesteryear that wasn’t manufactured from cheese and chocolate.

  • Lee Wingate

    Like a lot of stuff in cycling at the moment, with all the new riders, there’s a lot marketing BS floating around purely just to sell stuff that’s seriously overpriced with next years offering being 12% stiffer and a different colour.

    Save your money, go on a training camp and pedal harder is really what you need to do.

  • MrHaematocrit

    Hasn’t SRAM got enough stuff to recall

  • J1

    I’ve got a 105 5800 setup with a 34/32 lowest gear, that gets you up anything, sit down on 15% inclines sort of thing. You can always keep a nice cadence with this setup too, I was weary of this before I opted for it, but it works very well. My new best bike will be on a 28 lowest cog setup, I doubt I’ll notice much difference with an extra cog somewhere in there though.

  • J1

    All the above!

  • J1

    “Alex Dowsett is the present Hour Record holder”

    Come again?

  • David O’Brien

    As a 45+ Master’s Cat 3 crit and cyclocross racer that is putting in 10k miles (16k KM) per year, I’m hardly a “new comer”. (and yes, I know distance does not directly equate to intensity)

    53/39-11/23 works fine for you — great. Why are you and others so afraid to *offer* others the gearing they want? What are you afraid of? You wouldn’t be able to show how macho you are anymore? I’d love to come to your continent and ride with you to put your gearing in context.

  • Chris Zacho

    The cog range is listed above. Since it is a seven cog I am limited in the number of derailleurs that will work with it and still index properly. Currently I using an Alivio with Shimano bar-con levers. Certainly not top of the line, but I get consistent, reliable shifting, even with the ‘pie plate’ cassette. Good enough for non competitive cycling and touring.

    Personally, I think the cog and chain system may be entering it’s twilight anyway. The future will probably be internally geared hubs or even some cycling equivalent of the Continuously Variable Transmissions now showing up on cars. Neither of which are user serviceable, of course. But then manufacturers love use and discard technology anyway.

  • Geoff Smith

    Interesting Chris, so what is it exactly you have as your set up? What derailleurs etc. I have a Ultegra 10sp triple and like the normal set up and then the capacity to drop onto the low gear.

  • David O’Brien

    What happened to all the previous comments?!?

  • Lenny

    Maybe. But then again, maybe there’s a limit.

  • Lenny

    The elephant in the room that the article didn’t really go that much into… for 12-speed road to happen, you probably have to go to 135 MM rear dropout-spacing. Because you can only make the cogs so thin/cog-spacing and chain so narrow, and the wheel dish only so bad. =

    What that means is, compatibility issues, as in, kiss your old expensive wheelsets good-bye, and yeah, go buy some new 135mm ones.

    And after that, then what? Some jackass marketer/manufacturer will decide to push 14-speed and 140mm dropout spacing?? At some point, cyclists have to go, “Thanks but no thanks, we’re not going to buy that. Get lost.”

    Really hope 12-speed is the last stop on the merry-go-round. If you need more cogs than that, maybe you should go buy that CVT bike drivetrain that’s out there (despite it being heavy), or some internal-hub system with a zillion gear combos (despite it having higher friction and not being sexy).

  • RT

    I’m ancient, and 53/39 x 11-23 works fine for me. It’s what people have been using for decades (except for the 11 sprocket). Perhaps newcomers to cycling should try training a bit more rather than complaining about the equipment.

  • David O’Brien

    What marlarky! Just as a single chainring “can never replace the full range of gears in a double-ring set-up”, a double-ring can never replace the full range of gears in a triple.

    Though this is mostly the fault of try-to-force-everyone-into-a-cookie-cutter equipment makers. Shimano and FSA had a chance to offer a smaller chainring than 34T with their new 4-arm cranks. But NO! They’re only for 20-30’s year old racers. In fact, current 110BCD could have a 33T small, but pigheaded OEM’s don’t bother offering it.

    Most folks don’t really need a 50×11, 48×11 would be fine — letting the small go down to 32T or 30T so one can easily get a 1:1 without huge gaps between gears. Same stupidity when the OEM’s offered triples — always AxBx30T. 28T or 26T would have made so much more sense to your common enthusiast rider living in hilly areas (such as the California Bay Area).

    So instead we see everyone shoe horned into 50x34T with some HUGE 11×36 or 11×42 cassette to get low gearing for the 45+ crowd. And the EOM’s want to tell me there won’t be HUGE jumps between the cogs of this?!?

  • David Chadderton

    What,exactly, is wrong with having a triple chain set and 27 gears! Unfashionable? Pride? Looks Dorky? Only for tourists? The extra weight of a 22 aluminium tooth chainring is negligible. Ok, professional Tour racers do not use triples. But, how many of them are in the world? 400? So, it’s all right for the rest us 7 bn people to have triple chain sets, right?

  • Chris

    Speak for yourself. Personally I use all mine, and occasionally wish I had more!

  • Charlie

    Obviously not aware of cadence…

  • Roger

    Utter nonsense.

  • Hugh Strickland

    The mess being done to bicycles is just a fad. Most people use three sprockets on a cassette and one chain ring, all else is vanity.

  • Erik Van Bommel

    If someone will build it, they will buy it.