KISS — Keep It Simple, Stupid. There’s a lot to be said for simplicity, and one way to make a bike’s transmission simpler is to ditch the usual pair of chainrings and get by with just one.
A few years ago this would have been unthinkable. The unquestioned way to get a wide range of gears on road bikes was to have at least two chainrings. It’s generally a good idea for gear ratios to be fairly closely spaced. An eight- or nine-speed cassette and two chainrings gave you two overlapping ranges of reasonably closely spaced gears. When you ran out at the high end of the small chainring or the low end of the big ring, you just changed chainring and maybe changed a sprocket or two as well to get to the next higher or lower gear.
It’s taken the bike industry a while to catch on, but the development of 11-speed cassettes changed things substantially. You can now have 11 reasonably closely-spaced gear ratios with just one chainring. You save the cost and complexity of a double chainring, front derailleur and shifter, and it’s one less thing to think about as you ride.
Single-chainring systems are now very common on mountain bikes, where they're known as 1X (say "one by", as in 1X10, 1X11 and even 1X12). That’s driven development of the technology that has now spilled over to drop-bar bikes. Mountain bike designers had extra incentives to ditch the front mech; getting rid means no longer having to design a suspension system around it. You can put your suspension pivot where you like, and it’s also easier to accommodate fatter tyres if you don’t also have to find room for two or three chainrings between the frame and the crank arm.
So far, most the spillover of single chainring systems to drop-bar bikes has been for cyclocross racing. Cyclocrossers have been using single-ring set-ups for decades, because if you’re going slowly enough to need the low gears of a small chainring, you should probably be running. Single chainrings with teeth designed to keep the chain in place have helped make this more popular; some previous cyclocross single-ring systems used a pair of chain guards to keep the chain on. Effective, but hardly elegant.
Gravel/adventure riding is another genre where single chainrings have traction, for the same reasons of simplicity that make them popular on mountain bikes. However, at the moment you could argue that single-ring transmissions have a small problem with limited gear range for riding that often involves very steep climbs or luggage. Hubs with SRAM’s XD and XDr freehub bodies help solve this problem by allowing a ten-tooth smallest sprocket. SRAM also offers 12-speed transmissions in the wireless eTap AXS systems, allowing the combination of a 10-50 Eagle 12-speed cassette, AXS mountain bike derailleur and drop handlebar shifters. If your budget won't stretch that far, and you’re looking at a bike with SRAM’s 11-speed 10-42 cassette and want lower gears, you can always fit a smaller chainring and coast on steeper descents.
Speaking of SRAM, most of the bikes here still have SRAM transmissions. Shimano was slow to get on the single-ring mountain bike bandwagon and only recently introduced drop-handlebar groupsets with straightforward single-ring compatibility in the GRX series. Nevertheless Shimano is making inroads; we'll see more single-ring bikes with Shimano transmissions in future now that manufacturers don't have to bodge them together.
Like all new developments in bikes, single-chainring systems divide opinion. Among the road.cc editorial team, for example, road.cc founder Dave Atkinson has enthusiastically embraced 1X and does most of his riding on a single ring. He says: "There are plenty of good reasons to run a 1X setup. For a start there's no front mech, and front mechs are a faff. They jam up easily because of their mounting position, they rub on the chain and they drop the chain or push it over the top of the big chainring if they're not perfectly set up. You don't get any of those problems with a single ring, and a thick-thin chainring never, ever drops the chain, in my experience. Ever.
"Secondly, gearing becomes rational, simple and logical. Too hard? Change up. Go faster? Change down. There's none of the psychological baggage that comes with swapping chainrings and no having to adjust your gear at the rear too when you do. And there's one less gear cable to look after as well. They're quieter, too: no chain slap because of the clutch (or stronger spring) in the mech, no movement of the chain on the chainring and no rubbing of the front mech plates.
"I've been running a single ring transmission on my main bike, a Kinesis Tripster ATR, for a couple of years now, and I'm sold on on it as a great general purpose setup. It'll depend on what you use your bike for, but for an everyday machine they're great."
On the other hand, technical editor Mat Brett is a sceptic. He acknowledges the simplicity of 1X and the way you can't get chain rub on a front mech that's not there, but says: "You get some gert big jumps in gear ratios across such a wide-range cassette. In a typical set-up, the 38-tooth chainring and 42-tooth sprocket give you a 24.3in gear while the next largest sprocket is 36-tooth and gives you a 28.3in gear. It can be difficult to keep your rhythm when swapping from one to the other.
"That said, the 42-tooth sprocket will get you up nearly anything – not necessarily quickly, but at least you'll keep progressing.
"At the other end of the scale, I find myself running out of gears on long, fast descents. If you want to pedal at over 28mph you have to spin at more than 100rpm in an 11-tooth sprocket. If you want to pedal at over 33mph you're looking at 120rpm, so I find myself just coasting more often than usual. If you're going to ride only on tarmac and unladen you might find many 1X systems under-geared."
Let’s take a look at some single-chainring bikes.We've listed the gear range for each one, in gear inches based on a 27-inch wheel. That's about the rolling diameter of an ETRTO 584mm (650B) wheel with a fat tyre or an ETRTO 622mm (700C) wheel with a 32mm tyre. A change of tyres will change the gearing, but these numbers provide a basis for comparison of gear ranges between bikes.
Our Stu really liked the ride of the Nuroad SL's twin-chainring version, calling it "a much more fun bike to ride than you might expect; it's comfortable, and offers a smooth ride".
The SL uses the same 6061-T6 aluminium frame that gives that bike its very balanced steering and beautifully weighted feel that seems to offer plenty of feedback throughout so you can still push on into the bends knowing exactly what the tyres are up to.
This stripped-down 1X version should offer all the sizzle of the Nuroad platform without the Race FE extras, giving a simple, fun all-rounder.
Gear range: 29-97 inches
Cervelo's speciality since it founded in 1995 has been high-end road race bikes, but that all changed this year with the launch of the Aspero, its first foray into the gravel bike market. What we have here is a rapid full-carbon gravel racer that marries the performance of Cervelo's road bikes with some smart details that create a multi-surface capable bike, chief of which is adjustable fork offset.
Cervelo has used SRAM's new Force AXS wireless electronic shifting here, which incorporates a new approach to gearing, using smaller chainrings and sprockets to give a wide gear range with less weight. With 12 sprockets on the rear wheel it's currently the best way to get a speed-orientated, closely-spaced set of gears.
Gear range: 26-98 inches
The Genesis Vapour 30 offers a fun ride that feels at home in a race and on a trail. The build isn't that flashy, but the package works well and continues to do so in the worst conditions. You'll be wanting a wheel upgrade for more serious racing, though.
Taking the Vapour 30 out for the first time, you notice the quiet way that it goes about tackling technical and rugged terrain. Cruising down a rough footpath, the bike felt incredibly smooth despite the 33mm Donnelly MXP clincher tyres being run high at 30psi.
That's a great feature as most of the local races take place on bumpy scrubland and it can be easy to get out of control on a rutted descent. A quiet ride is also a great sign of the internal build; a noisy ride is usually a sign of poorly routed cabling, so silence, in this instance, is definitely golden.
Gear range: 34-98 inches
The Ibis Hakka MX provides a smooth and fast ride with great handling and space for wide tyres and versatility by way of mudguard mounts, and it’s light on the scales, but it is a pricey prospect in a competitive marketplace.
While probably best known for its mountain bikes (it’s one of the oldest mountain bike brands having been founded in 1981) Ibis isn’t immune to the charms of the growing adventure category and two years ago redesigned its cyclocross bike into a much more capable adventure and gravel bike.
It still retains some of that cyclocross DNA. The ride is fast and direct with the geometry not as slack or stretched as some more progressive bikes in this burgeoning adventure and gravel category. If you want to race CX on a Sunday and ride gravel on a Monday, the Hakka MX would be a good choice.
Gear range: 26-98 inches
British bike brand Kinesis Bikes has good form when it comes to versatile all-terrain drop bar road bikes with its Tripster AT and ATR, and this new G2 continues that trend but ups the accessibility factor with an aluminium frame, SRAM Apex 1x groupset and £1,500 price tag. It's huge fun off-road, fast and comfortable on the road, and adaptable to different riding requirements.
For mixing up rides with stretches of country lanes and diving into the woods and along bridleways, dirt tracks and through skinny singletrack, before pottering back into town along the cycle path for a flat white and brownie to recover and Instagram your adventure, the G2 is bob on.
Gear range: 26-98 inches
The Bergamont Grandurance 6 is a well equipped aluminium gravel bike or ‘all-road’ bike. It’s decent value and has got a striking paint job, if not paired with the most progressive geometry. This is a classic endurance road bike with allowances for gravel tyres, mudguards and racks but for the price, I think it’ll make any owner a great weekend gravel adventure bike that will commute with ease on the weekdays too.
The Bergamont Grandurance is capable, tough and will happily turn a wheel to most situations. It is a myriad of contradictions. The tyres are really built for the road or at least dry fire roads, and the position isn’t particularly aggressive, think endurance road bike rather than mountain bike. The head tube length is a bit shorter than other bikes in its class but there was plenty of room left on the steerer to choose your bar height, something I left rather high to prevent me feeling too tipped over the front, giving the feeling of better balance and control on off-road descents. The gearing is aimed at adventures off road rather than on it but if you've chosen a 1x bike, that's likely your intention anyway. The parts complement each other and this bike is a brilliant jack of all trades, it gives you the option to stray from the beaten track and widen your route horizons.
For the 2020 model, Bergamont has fitted the Grandurance 6 with Shimano's new GRX RX600 11-speed shifting in place of the previous model's SRAM Apex.
Gear range: 26-98 inches
What’s in a name? Or how important is a name? UK brand Saracen has chosen Levarg - gravel backwards - which is either inspired or lazy. Either way, underneath the name, the Levarg SL is a fast and fun bike well-suited to taming the UK’s poorly surfaced roads and bashing along dirt and gravel tracks.
Saracen has a heritage in the mountain bike world and its approach to a drop bar adventure bike provides very good results, with a great ride on the road whether commuting or Just Riding, to bashing gravel or smashing techy descents and linking lots of off-road trails with linking road sections. With an eye on bikepacking adventures, you’ve you an extra bottle cage mount and good space in the main frame for adding a frame pack.
Gear range: 27-103 inches
The Mason Bokeh is a highly capable adventure bike with a feature-packed aluminium frame, splendid aesthetics, and handling that ensures it's as at home on the road as it is on the trail.
The Bokeh combines an aluminium frame and carbon fork with all the key ingredients of an adventure bike, including wide tyres, disc brakes, thru-axles, relaxed geometry and mounts for mudguards and racks. The Bokeh goes the extra mile with a front dynamo mount, third bottle cage mount, 700C and 650B wheel size compatibility and fully internal cable routing.
You can have all Mason's bikes with 1X gearing, and the set-up Mason has chosen here is as versatiled as it gets.The wide-range SRAM 10-42 cassette paired to the 42-tooth chainring up front will get you up and down most climbs and descents without unduly running out of ratios.
Gear range: 27-113 inches
SRAM kicked multiple goals with the AXS eTap wireless electronic shifting they launched in 2019 and one of them was making the mountain bike and road bike versions interchangeable so that you could assemble a hybrid gear system like this, with a SRAM XX1 Eagle AXS rear derailleur, drop-bar brake/shift levers and a huge 10-50 12-speed sprocket selection.
The Diverge is one of our favourite bikes of recent years, and this luxury edition is no exception. Dave Arthur described it as “one of the best adventure bikes I've ridden” and added: “It's a sophisticated ride with buckets of capability for going fast and tackling big journeys over varied and challenging terrain.” It’s not exactly cheap though.
Gear range: 23-113 inches
One of the most exciting road bikes around, 3T's Strada is the only single-chainring aero road bike available, and while its tight clearances and inability to run a double chainset might put some people off, those issues fade away when you ride it. It's a truly stunning bike with breathtaking speed, impressive smoothness and fine handling balance.
Gear range: 42-122 inches
Stick knobbly tyres on a road bike and you get an indifferent off-roader, at best. But put slicks on a mountain bike and it'll blat along on the road perfectly well. With that in mind, Merida based their Silex bikes on mountain bike geometry and – to a certain extent – riding position, and the result is a belting all-rounder that's lots of fun off-road.
Gear range: 26-98 inches
This is the carbon fibre version of a bike we reviewed and really liked in 2017, and in going composite it's shed a couple of kilos of weight, which is impressive. We expect the Hook EXT-C to be as big a bundle of fun as its steel cousin, but less work on climbs and on the road. Trail riding is where the Hook EXT really excels though, thanks to huge 2.2-inch ETRTO 584mm (650B) tyres.
Gear range: 26–98 inches
All of Specialized’s Crux cyclocross bikes now have singe chainrings, and this one is a simply brilliant crosser that provides really good handling, bags of pace and all the benefits that disc brakes bring to the party, all wrapped up in a bold looking package. It's ready to race, but is equally at home blasting along bridleways and through the local woods for a couple of hours.
Gear range: 34–98 inches
Trek's Crockett is mostly a race-ready cyclocross bike, but features like the clever Stranglehold rear dropout and relatively tall head tube make it more than a one-trick pony.
Gear range: 34–98 inches
The SuperX has a stellar frame, with a smooth, stable ride that's perfect for flatter cyclocross courses and playing in the trails. You'll probably want to upgrade the wheels though; they're a bit beefy.
The 2020 switches component allegiance from SRAM to Shimano's new GRX, except Cannondale have used the Ultegra RX rear mech instead of either of the GRX options.
Gear range: 32–98 inches
Whyte's Wessex is a longstanding road.cc favourite. Here it's configured as perhaps the ultimate fast day-ride bike for dirt roads and neglected, frost-ravaged back lanes. Racing aside, it's all the bike you really need for year-round riding in the UK, fast enough for sportives and pacy training runs, comfortable and reliable for grinding out winter miles, and at home on longer commutes. Only a British company could design a bike that is absolutely, perfectly, 100 per cent suited to the demands of year-round UK road cycling.
Gear range: 28–119 inches
Marin's latest gravel/adventure bikes, the two bikes in the Headlands range have carbon fibre frames and a huge selection of mounting points for backs, racks, and any attachments you can imagine.
For the top model, Marin has used Shimano's new GRX 800 components, including the wide-range rear mech that accommodates a 10-42 cassette. The left-hand shifter operates a dropper post so you can shift your weight down for improved cornering on fast descents.
Gear range: 27–113 inches
The gravel/adventure thing may have softened some cyclocross bikes a touch to make them more versatile but Boardman's CXR 9.4 is having none of it."Ready to race straight out of the box," it says on Boardman's website and while it could do with a couple of minor tweaks the CXR 9.4 is one flickable, lightweight off-road rocket which is an absolute blast on the technical stuff.
Gear range: 30-93 inches
Giant's flagship cyclocross bike, the TCX Advanced Pro 2 has a carbon fibre frame, tubeless wheel and proper cross racing tyres in its Maxxis All-Terrenes.
Gear range: 30–98 inches
With its carbon fibre frame, 45mm tyres and massive selection of gear mounting points, Kona's Libre platform is billed as coming "packed with everything you need for the ultimate adventure". There plenty of rack and mudguard mounts, four bottle mounts, a top-tube bag mount and Salsa-style three-bolt rack mounts on the fork legs.
Bit spendy for you? Its steel stablemate, the Rove ST, has many of the same features for just £1,499.
Gear range: 26-108 inches
The RUUT AL is an aluminium gravel/adventure bike from Polish brand Rondo. It’s a super comfortable multi-surface machine with agile handling that can be adjusted between fast and racy to more upright and relaxed through its cleverly designed, geometry adjusting Twintip fork. The 43mm Panaracer Gravel King tyres work well in all but silly conditions, and there's scope for 55mm ETRTO 584mm (650B) tyres and wheels if you want to go even fatter.
The RUUT distinguishing feature is that fork, which has swappable 'chips' in the tips that change the offset and ride height. The difference is not that noticeable at the handlebars as it’s only 1cm in height difference, but turning into switchbacks and barrelling along the singletrack, the difference in steering feel is noticeable. In the low axle position with the longer trail, the bike needs more input to take the same lines as the high axle position with the shorter trail. It's a clever feature, letting you choose the handling that you like best for your own trails and style.
Gear range: 26–98 inches
As the name implies, this is an endurance road bike with adventure tendencies, the only one of BMC's Roadmachine family to dispense with the traditional double chainset. By the standards of many of the bikes here it has skinny tyres at 34mm, indicating its purpose is more Tarmac than trails, but with a wide, low gear range it looks well suited to long days in the hills.
Gear range: 26-98 inches
The Polygon Bend CT5 is a rough and tough 'urban sport' bike that offers loads of versatility. It's not the lightest bike out there but it'll handle everything from all-weather commuting to gravel tracks, and it's a lot of fun. It offers a fairly upright riding position and a decent level of comfort, largely thanks to 30mm-wide Schwalbe G-One Speed tyres, and it's easy to fit mudguards and racks.
The Bend CT5 really shows its worth over poorly surfaced roads. It doesn't just cope with randomly-varying crummy road surfaces, it eats them up, giving you the confidence to tackle the next section that bit quicker and generally putting a smile on your face.
Gear range: 24–93 inches
Drop-bar bikes with ETRTO 584mm (650B) tyres are still quite rare, but Vitus has chosen the smaller and arguably more versatile wheel size here, and built it in carbon fibre to keep the weight down. With hydraulic disc brakes, 1x groupset and full-carbon fork, this Substance CRX holds plenty of appeal for the modern day on/off-roader.
Gear range: 26–108 inches
Whyte is also clearly a believer in the 650B concept too, enough to call the Glencoe " the best all round road bike we have ever made". But like the Merida Silex it shows strong signs of Whyte's expertise in mountain bikes, with a long frame, short stem and wide bar for control on crummy surfaces. The 47mm tyres put the Glencoe in the RoadPLUS category, Marin says and we've certainly been impressed by the capabilities of the WTB Horizon tyres Whyte has chosen. If you're looking for something a bit out of the ordinary, the Glencoe deserves close examination.
Gear range: 28–108 inches
The Energie VR is an excellent tool for thrashing round in the mud for an hour on a Sunday, and it's versatile enough for more general riding. The drivetrain is excellent and it's tubeless-ready out of the box. For the money, it's hard to fault. It's built around a 6061-T6 triple-butted hydroformed aluminium alloy frame that's mated to a full carbon fork, and both of those are tidily built. The bike has mounts for a rack and full mudguards and two sets of bottle bosses, so it's properly versatile if you want to run it as a winter bike/adventure bike/tourer.
Gear range: 30–98 inches
With its wide, flared bar, the Sonder Camino from outdoor equipment specialists Alpkit is very much at the 'off-road adventure' station on the liine spectrum from pothole-basher to intercontinental expedition. This is a bike that enjoys going off-road but would also be quite happy taking you longer distances on tarmac too. The bias – and the way the bike is specced certainly corroborates this – is towards off-road adventuring. The comfortable position is perfect for gravel excursions or riding long distances loaded with luggage, but is just a little too upright for longer (proper) road rides. It’s a do anything bike with a definite off-road flavour, but above all, it’s a bike to have fun with at a price that belies its capabilities.
Gear range: 26–98 inches
Evans Cycles rightly describes the Arkose as being "a gravel bike before we were using the term". The 2019 Arkose line has been revamped with more tyre clearance, and a range of builds for different purposes, some for predominantly road riding, some for dirt and the X, which is a true do-everything bike. It has SRAM's Rival 1 transmission and hydraulic disc brakes, with 650B wheels shod with WTB's 47mm 'road plus' Byway tyres.
Gear range: 27–103 inches
Chris Boardman has always said that his cyclocross bikes are his favourites in the range. With a big gear range, SRAM Apex hydraulic discs, and mounts for racks and mudguards, the CXR 8.9 exemplifies the versatility Boardman loves about cyclocross bikes, and it's outstanding value for money.
Gear range: 28-108 inches
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Acknowledged by the Telegraph as a leading cycling journalist, John Stevenson has been writing about bikes and cycling for over 30 years since discovering that people were mug enough to pay him for it rather than expecting him to do an honest day's work.
He was heavily involved in the mountain bike boom of the late 1980s as a racer, team manager and race promoter, and that led to writing for Mountain Biking UK magazine shortly after its inception. He got the gig by phoning up the editor and telling him the magazine was rubbish and he could do better. Rather than telling him to get lost, MBUK editor Tym Manley called John’s bluff and the rest is history.
Since then he has worked on MTB Pro magazine and was editor of Maximum Mountain Bike and Australian Mountain Bike magazines, before switching to the web in 2000 to work for CyclingNews.com. Along with road.cc editor Tony Farelly, John was on the launch team for BikeRadar.com and subsequently became editor in chief of Future Publishing’s group of cycling magazines and websites, including Cycling Plus, MBUK, What Mountain Bike and Procycling.
John has also written for Cyclist magazine, edited the BikeMagic website and was founding editor of TotalWomensCycling.com before handing over to someone far more representative of the site's main audience.
He joined road.cc in 2013 and these days he lives in Cambridge where the lack of hills is more than made up for by the headwinds.