A single-chainring drivetrain can work brilliantly on a road bike, but “1x is simpler” is not enough information to choose one. Removing the front derailleur simplifies controls and chain management. The cost appears at the cassette: either the gear range becomes narrower, or the jumps between some gears become larger.

Current 13-speed SRAM XPLR systems make that compromise less severe than earlier 11-speed road 1x setups. A 10–46T cassette offers 460% range and closely spaced small sprockets, yet the biggest climbing shifts remain noticeably larger than a typical road cassette.

Quick verdict: Choose 1x for rolling roads, time trials, criteriums, all-road riding and simple mixed-surface bikes when predictable chain retention matters more than perfectly even cadence steps. Choose 2x for fast group rides across varied terrain, long alpine climbs and riders who frequently fine-tune cadence.

What Changes When You Remove the Front Derailleur?

A 1x drivetrain uses one narrow-wide chainring, no front derailleur and no front shifter movement. The rear derailleur normally includes stronger chain-management features than a traditional road mechanism.

You remove:

• one chainring;
• the front derailleur;
• front-shift setup and adjustment;
• one source of chain rub and dropped front shifts.

You add or emphasise:

• a wider-range cassette;
• a longer-cage or 1x-specific rear derailleur;
• larger percentage jumps between selected sprockets;
• frame, freehub and chainline compatibility checks.

The result is not automatically lighter. A large cassette and robust clutch derailleur can offset the missing front components. Simplicity and chain security are usually stronger reasons to convert than headline weight.

Current 1x Systems: Road 1x vs XPLR

“Road 1x” covers at least two different use cases.

The first is a high-speed setup using a large SRAM RED or Force AXS 1x aero chainring with a comparatively tight road cassette. SRAM currently lists 1x direct-mount rings across a wide size range, with aero options aimed at time trial, triathlon and fast road use. This configuration prioritises speed and small cadence changes but may not provide a low climbing gear.

The second is SRAM Force or RED XPLR AXS 13-speed, using the dedicated 10–46T cassette and Full Mount derailleur. This provides much wider range for steep roads and mixed surfaces. Force XPLR crank options include standard rings and aero rings, but the drivetrain is still designed as an XPLR system rather than a universal upgrade for every road frame.

Understanding Range, Ratios and Gear Steps

Gear range is calculated by dividing the largest cassette sprocket by the smallest. A 10–46T cassette therefore has 460% range. This says nothing about how evenly the gears are spaced.

The current Force XPLR XG-1371 sequence is:

10-11-12-13-15-17-19-21-24-28-32-38-46

The first four sprockets provide relatively close high-speed steps. The final shifts are larger: 32 to 38T is an 18.8% change, and 38 to 46T is about 21.1%. Those jumps are useful when the road turns sharply upward, but a rider trying to hold an exact group-ride cadence may feel caught between gears.

The 1x example matches or exceeds the total range of familiar 2x combinations. The difference is distribution: 2x creates overlapping ratios that can keep steps smaller, while 1x gives one linear sequence with no duplicate gears.

Choosing the Right 1x Chainring

Chainring size shifts the whole range. With the same 10–46T cassette:

These ratios are more useful than labels such as “pro gearing.” Consider the steepest climb, your preferred cadence and how long you need to sustain it. A 50T ring that looks fast can force low cadence on a climb; a 40T ring can cause you to spin out only at speeds you rarely maintain.

Wheel circumference also affects actual rollout, so use a gear calculator with your tyre size before buying. When uncertain, choose the lower gear. Losing one theoretical high-speed ratio is usually less disruptive than running out of gears halfway up a long climb.

Chain Retention and Rough-Road Reliability

A proper 1x system is not simply a double crank with the inner ring removed. Narrow-wide tooth profiles alternate around the chain's inner and outer links, while a clutch or damping mechanism controls the lower chain run.

SRAM's current Force XPLR AXS rear derailleur is 1x-specific and designed around the 13-speed 10–46T cassette and Flattop chains. Its Full Mount architecture attaches through a UDH-compatible frame interface and removes conventional derailleur-hanger adjustment.

That creates an important compatibility gate: many existing road frames do not use UDH and cannot accept the current Full Mount XPLR derailleur. An older 12-speed XPLR derailleur may fit a conventional hanger, but it uses a different cassette and compatibility map. Do not mix 12- and 13-speed parts based only on the XPLR name.

Chain length, chainline and frame clearance remain critical. A chain guide may add security for racing or very rough surfaces, but it cannot correct a badly aligned chainring.

Frame, Freehub and Component Compatibility

The XG-1371 10–46T cassette uses an XDR driver. A Shimano HG freehub cannot accept it without changing the compatible driver body or wheel hardware. The current Force XPLR Full Mount derailleur also requires the correct frame interface.

Before conversion, verify:

1. Exact frame compatibility with the rear derailleur.
2. XDR driver availability for the rear hub.
3. Maximum chainring clearance at the chainstay.
4. Correct road or Wide chainline for the frame.
5. Approved chain type and length.
6. Brake/shift control compatibility and firmware.
7. Whether the crank, cassette and derailleur belong to the same 12- or 13-speed generation.

SRAM specifies different crank guidance based on chainstay length for its current Force XPLR derailleur. That is a sign to use the official compatibility map, not a generic online build list.

1x vs 2x on Real Road Rides

On a flat time trial, 1x can be ideal. The rider chooses a large ring and tight cassette around the target speed, removes the front shift and gains a visually clean drivetrain. On a rolling criterium, one shift control and strong retention can also be attractive.

Long mountain routes expose the trade-off. A wide cassette supplies the necessary low ratio, but the large climbing-side jumps can disrupt cadence. During a fast group ride, a 13-to-15 or 21-to-24 shift may be larger than the change you want when the pace moves slightly.

Efficiency, Chainline and the “Straight Chain” Myth

A 1x drivetrain is not always more efficient merely because it has fewer parts. In the middle of the cassette, chainline may be favourable. At the largest and smallest sprockets, the chain runs at a greater lateral angle.

Large sprockets can reduce articulation losses for a given ratio, while cross-chain angle, chain tension, lubrication and tooth design all influence total efficiency. The result changes across the cassette. It is more accurate to say that 1x simplifies the mechanism than to claim it universally saves watts.

Good maintenance matters more than small theoretical differences for most riders. A clean, correctly lubricated chain and unworn cassette can preserve more performance than changing drivetrain format.

Conversion: When It Makes Sense

Converting an existing bike is attractive when the frame, wheel and controls already support a coherent system. It is risky when the plan depends on adapters, unofficial firmware combinations or a derailleur beyond its specified capacity.

Good conversion candidates include:

• a compatible UDH all-road frame;
• a TT bike used on known courses;
• a criterium bike where top and low ratios are easy to predict;
• a winter bike where simple cleaning and chain retention matter;
• a mixed-surface bike already using an XDR wheel.

Keep 2x when you regularly need both a low climbing ratio and small high-speed cadence steps. A front derailleur is not a failure point that every rider needs to eliminate; current electronic 2x systems shift very well when installed correctly.

Cost and Upgrade Priorities

A proper conversion may require a chainring or crankset, cassette, rear derailleur, chain, XDR driver and possibly new controls. The total can exceed the cost of maintaining the existing 2x drivetrain.

Spend first on compatibility and gearing, not an aero chainring. A solid ring may offer a small aerodynamic benefit in a high-speed application, but it does not fix an unsuitable cassette range. Likewise, a power-meter chainring locks measurement electronics and gearing into one expensive part, so consider future ring-size changes.

For riders still experimenting, a non-power ring and standard crank are easier to revise. Record your current gears on representative rides before purchasing: note the smallest and largest ratios actually used, plus the cadence gaps that already bother you.

Final Recommendation

Modern 13-speed XPLR makes 1x more capable than it was in the 11-speed era. A 46T ring with 10–46T cassette can cover a familiar road range, and the small end of the cassette provides useful high-speed steps. It still cannot reproduce the closely spaced choices of a good 2x setup across the whole range.

Choose high-speed road 1x when the course is predictable. Choose XPLR 1x when range, rough-road security and simplicity matter. Keep 2x when your riding moves repeatedly between fast pacelines and long climbs.

Most importantly, buy a complete compatible system. The current 13-speed Force XPLR derailleur, cassette and frame interface are not interchangeable with every older AXS or XPLR component.

Frequently Asked Questions

Is 1x slower than 2x on the road?

Not inherently. Speed depends on available ratios, cadence and aerodynamic position. A poorly chosen ring can limit either climbing or top speed, while a correctly chosen 1x setup can be excellent on a defined course.

Does a 10–46T cassette have more range than compact 2x?

It has 460% range, similar to or slightly greater than common compact 2x examples. A 2x system distributes its ratios differently and usually offers smaller cadence steps.

Can I fit current 13-speed Force XPLR to any road bike?

No. The Full Mount derailleur requires the appropriate UDH-compatible frame interface, and the cassette requires XDR. Confirm the complete compatibility map.

What chainring should I use with 10–46T?

For road-biased use, 44 or 46T is a practical starting range. Steep mixed terrain may favour 40 or 42T; flat racing may justify 48 or 50T. Calculate ratios for your own terrain.

Can I mix 12-speed and 13-speed XPLR parts?

Do not assume so. Current 13-speed Full Mount components and earlier 12-speed hanger-mounted systems have different compatibility requirements. Follow SRAM's exact model-code map.

Do I need a chain guide?

A correctly installed narrow-wide ring and clutch derailleur provide primary retention. A guide can add protection for racing or very rough terrain but is not a substitute for correct chainline and chain length.

Is an aero chainring worth it?

It is most relevant for high-speed time trials and triathlon. For general road riding, correct gearing, fit and chain maintenance have greater practical value.

Is 1x easier to maintain?

It removes front-derailleur setup and one chainring, but the rear system still needs correct adjustment, chain care and cassette replacement. Simpler does not mean maintenance-free.

Products Mentioned

• SRAM Force XPLR AXS rear derailleur — verify whether the listing is the current 13-speed Full Mount model or an earlier 12-speed version.
• SRAM Force XPLR 10–46T cassette — current 13-speed XDR cassette for the matching XPLR system.
• SRAM RED X-SYNC 1x aero chainring — high-speed road, TT and triathlon option in compatible sizes.

Affiliate disclosure: RydeCruz may earn a commission from qualifying purchases made through affiliate links, at no extra cost to you. Product availability and prices can change.