Gear Break – Into Spring: Shimano Tiagra, Specialized Cotton TLR, 4iiii Viiiiva HRM, Liv Helmets, Rapha Pro Team, Cervélo Caledonia

Here at PezCycling News, we’ve got another exciting Gear Break for you to prepare for the break into spring. From new components, to performance monitoring accessories, to new clothing, the industry is cranking up for your break into spring. First up, Shimano has dropped a new mechanical 2×11 Tiagra groupset bringing proven 105 level performance to the masses at an accessible price point. The long rumored Specialized Cotton TLR tires were spied in the paddock at Omloop last weekend, and then they dropped on Tuesday. 4iiii has launched a new heart rate monitor with 500+ hours battery life to aid more precise training. Liv has dropped two super cool (pun intended) helmets. Rapha Pro Team kit will make you feel as good as you look. And lastly, climb on board the all new Cervélo Caledonia all-road bike, and get away!

Shimano Tiagra R4000
Modern performance, accessible

Shimano has launched the new Tiagra R4000, a refreshed 2×11-speed mechanical road groupset created to deliver confident shifting, practical gearing, and a more accessible fit for a wider range of road riders. With a focus on real-world usability, from lever reach and comfort to drivetrain compatibility, Tiagra R4000 delivers modernized road performance at an attainable price.

At the heart of the system is an updated shifter with an ergonomic lever design. These shifts levers offer easier reach across a wider range of hand sizes. The updated group includes a new lightweight 11–36T HyperGlide cassette option for 2×11 road configuration. The 11–36T cassette delivers a broad range for mixed terrain and climbing. At more than 200 grams lighter than reference configurations, riders get a lighter road setup without sacrificing gear range.

Key Features

• Ergonomic lever design with easy reach to support more hand sizes and riding positions.
• New lightweight 11–36T cassette option for wider-range gearing on a 2×11 road system.
• New TIAGRA rear derailleur (RD-R4000) designed for 2×11 operation.
• Supporting traditional road bikes with a small q-factor, short chainstay length, and bigger chainrings available.

Tiagra R4000 Lineup

Rear Derailleur: RD-R4000

The Shimano Tiagra rear derailleur is designed for 2×11-speed road bikes, delivering smooth, precise shifts. Its compact, refined design combines lightweight construction with reliability for an exceptional road-riding experience.

Front Derailleur: FD-R4000

With lighter front shifting and smooth, natural shift action, the Shimano Tiagra 11-speed front derailleur is an ideal choice for the road cyclist. With Shimano’s toggle link construction and an optimized cage design, it delivers the on-demand shift performance modern road riders demand.

Crankset: FC-R4000 (52–36T and 50–34T options)

The new Shimano Tiagra FC-R4000 crank embodies the DNA of Shimano’s high-end road designs, delivering an ideal balance of weight and efficiency. Purpose-built for road cycling, it is available in two chainring options, 52-36T and 50-34T, and in crank arm lengths of 165, 170, 172.5, and 175mm.

Dual Control Levers / Shifters: ST-R4020-L (left), ST-R4020-R (right)

Refined lever design enhances road performance. The SHIMANO TIAGRA 2x11s DUAL CONTROL LEVER incorporates advanced ergonomics from the acclaimed SHIMANO 105 series. Its redesigned lever position and bracket, developed through research on various hand shapes, ensure superior comfort and control for road cyclists. Featuring a premium feel, reliable hydraulic disc brake power, and smooth shifting, the TIAGRA 2×11-speed system offers precision and confidence on the road.

Cassette: CS-RS400-11 (11–36T)

The 11-36T 11-speed cassette offers a 327% gear range. Whether sprinting on the flats or tackling steep climbs, you can choose the ideal gear ratio for a wide range of situations.

Chain: CN-HG601-11 (existing model; not new)

This Super Narrow HG-X11 directional chain offers precise shifting and improved durability thanks to SHIMANO’s SIL-TEC treatment on the inner plate surfaces.

Availability & Pricing

Shimano Tiagra R4000 is available now from your favorite retailer. Pricing of individual components is reported as follows for the US. Pricing in other markets will vary.

For full details head over to shimano.com.

Note: Shimano still list R4700 (2×10) Tiagra components. New Tiagra (2×11) is R4000.

Specialized Cotton TLR
Get wider, get faster

For the last nine months, the tech-obsessed corners of the cycling world have been buzzing with a single, persistent rumor: Specialized was finally bringing its “pro-only” cotton tubeless technology to the masses. What started as whispers in the 2025 Tour de France paddock—where unbranded, tan-walled tires were spotted on the bikes of Red Bull-Bora-Hansgrohe—turned into a full-blown frenzy. The speculation reached a fever pitch last weekend at Omloop Het Nieuwsblad. Eagle-eyed mechanics and fans spied the unmistakable texture of the new Cotton TLR in the team paddocks.  Belgian champ Remco Evenepoel rode the 30mm tire and Dutch superstar Demi Vollering (photos of her bike immediately after she won the Omloop) rode on the 32mm, putting them to the ultimate cobbled test.

The wait officially ended this past Tuesday, March 3, when Specialized finally pulled back the curtain.

Wider is Faster

The Cotton TLR isn’t just a tubeless version of the classic Turbo Cotton; it’s a total reimagining of what a race tire should be. The biggest takeaway from the professional peloton over the last season is that wider is faster. Gone are the days of skinny 23mm tires pumped to rock-hard pressures. The modern pro-standard has shifted toward high-volume tires that offer better “conformity”—the ability of the tire to deform over road imperfections rather than bouncing over them. This reduces vibration and rolling resistance, effectively saving watts while keeping the rider fresh for the finale.

The Construction: Suppleness Reborn

At the heart of the tire is a 320 TPI (Threads Per Inch) Poly-Cotton-Corespun casing. By blending a strong polyester core with supple cotton fibers, Specialized has created a “live” feel that mimics a high-end tubular but with the convenience and efficiency of a modern tubeless system. This is paired with their dual Gripton T2/T5 compound: T2 in the center for maximum straight-line speed and T5 on the shoulders for confidence-inspiring grip in high-speed corners.

Specialized claim these tires offer 15% better puncture protection than the previous generation of non-tubeless Turbo Cotton tires. This is owed to incorporating their kevlar BlackBelt protection layer. But, the sidewalls are not reinforced, meaning cuts are a real possibility out on the road.

Key Specs & Pressure Ranges

Designed to be the fastest tire in the WorldTour, the Cotton TLR focuses on performance over extreme durability. These are a race day tire for sure. Local criteriums and the spiciest Wednesday Night Worlds ride is the use case. Tread life may exceed 1500km total mileage, but these are not optimal for daily driving.

• Casing: 320 TPI Poly-Cotton Corespun
• Flat Protection: hybrid kevlar BlackBelt breaker
• Compound: Dual Gripton T2 (Center) / T5 (Shoulder)
• Widths & weights: 28mm (280g), 30mm (290g), 32mm (320g)
• Compatibility: Hooked & Hookless (ISO Standard)

With the high-volume casing and tubeless design, riders can (and should) run lower pressures than traditional clinchers. While specific ranges depend on rider weight and rim internal width, the sweet spot for a 28mm tire typically sits between 55–75 psi, while the 32mm version used for the cobbles can comfortably drop into the 45–60 psi range for maximum traction and vibration damping.

Availability & Pricing

These tires are available now directly from Specialized, your local Specialized shop, or select online retailers. MSRP for the tires is $109.99, or €99,99.

Whether you’re chasing a local KOM or just want the “perfect” ride feel Remco raves about, the Cotton TLR is the new benchmark for the speed-obsessed.

4iiii Viiiiva Heart Rate Monitor
Long-term comfort and battery life

4iiii Innovations Inc., a leader in power-driven cycling performance, launches the newest Viiiiva Heart Rate Monitor. The new HRM from 4iiii combines comfort, durability, and an exceptional 540+ hour battery life.

4iiii Integration

Designed for athletes of all abilities, the Viiiiva uses a high-sensitivity chest strap to capture the heart’s electrical activity with medical-grade precision. The IPX7 waterproof rating and lightweight, comfortable design ensure it can handle the elements and the most demanding sessions, while instant data transmission via ANT+ and Bluetooth makes it compatible with any head unit or indoor training app.

The Viiiiva is also the perfect partner for the 4iiii PRECISION 3+ Powermeter, providing a complete picture of training and racing performance. While power measures external output in watts, heart rate tracks internal physiological response in beats per minute – together delivering a total understanding of effort, fitness and efficiency that neither metric can provide alone. This combination allows athletes to accurately track fitness gains, optimize recovery, perform every workout at the right intensity, and achieve precise training zone optimization that power or heart rate alone cannot deliver.

4iiii Sez

Phil White, President of 4iiii sez: “Heart rate and power are extremely valuable metrics for any athlete, irrespective of their level, aims or ambitions. The Viiiiva completes that equation for athletes using our power meters, providing both the internal and external view of performance. It offers the same level of accuracy and durability that defines our power meters, so you can trust your data in any conditions, from racing in the rain to long sessions on the indoor trainer.”

Alex Dowsett, Former WorldTour Cyclist, Coach and 4iiii Ambassador sez: “I tell every athlete I work with that power and heart rate aren’t competing metrics, they’re complementary. Power shows what you’re producing, heart rate reveals how your body is responding. The Viiiiva and PRECISION 3+ pairing gives you both with total reliability—which is essential whether you’re chasing marginal gains or building sustainable fitness. You can’t optimize what you can’t accurately measure.”

Product Features

The key Viiiiva specs:

• 540+ hour battery life from a single CR2032 coin cell
• Comfortable, lightweight design at under 46g including battery
• ANT+ and Bluetooth compatibility for seamless indoor and outdoor use
• IPX7 water resistance engineered to handle the toughest training conditions
• Precision heart rate measurement from 30 to 240 BPM
• Adjustable chest strap fits chest sizes from 66-132cm (26-52″)

Availability & pricing

The Viiiiva Heart Rate Monitor is available now through 4iiii retail partners worldwide and at 4iiii.com. MSRP for the new HRM is $99.99 | €64,99 | £64.99.

LIV MIPS HELMETS
Stay cool whether pursuing or climbing

Liv has officially unveiled two new performance helmets engineered through CFD development, wind-tunnel analysis, and real-world testing: the Liv Pursuit Mips and the Liv Rev Pro Mips. Designed to meet the evolving demands of modern performance riding, both models deliver refined aerodynamic efficiency, advanced ventilation, and independently validated protection.

Liv Pursuit Mips: Aerodynamic Speed

Built for performance-driven riders seeking a competitive advantage, the Liv Pursuit Mips prioritizes measurable aerodynamic gains without sacrificing cooling.

• Aerodynamic Gains: CFD modeling and wind-tunnel refinement were used to shape its profile, vent placement, and proprietary central dimple geometry.
• Efficiency: The design results in smoother airflow across a wide range of yaw angles, speeds, and head positions, saving an average of 1.66 watts compared to the previous generation.
• Internal Channeling: Optimizes ventilation during sustained efforts to close the gap between pure aero performance and all-day comfort.
• Race-Ready Adjustment: Features a five-position Cinch Pro fit system, lightweight strap architecture, and a Fidlock magnetic buckle.

Liv Rev Pro Mips: Advanced Cooling

The Liv Rev Pro Mips is designed with a ventilation-forward approach, making it ideal for long climbs, high temperatures, and extended high-output days.

• Heat Management: Advanced airflow modeling and thermal mapping guided the development of oversized vents and optimized internal channeling to evacuate heat at lower climbing speeds.
• Integrated Arch Reinforcement: Distributes impact forces across the helmet structure, enabling larger vent openings without compromising protection or increasing weight.
• Lightweight Efficiency: The helmet weighs just 280 grams for a size medium.
• One-Handed Adjustability: Includes a refined strap system, Cinch Pro retention, a Fidlock magnetic buckle, and integrated eyewear storage for stable sunglass placement.

Validated Protection

Both helmets utilize data-driven engineering to solve distinct performance challenges while delivering high-level safety standards.

• Virginia Tech Rating: Both models earned a five-star rating from the Virginia Tech Helmet Safety Lab.
• Impact Protection: Each helmet features dual-density EPS construction with a lower hard body design and integrated Mips Air Node Pro rotational impact protection.

Availability

These new models will be raced by Liv AlUla Jayco and the Liv Racing Collective across WorldTour road racing and elite triathlon. The Liv Pursuit Mips and Liv Rev Pro Mips are available now in select markets worldwide.

For more information, visit liv-cycling.com.

Rapha Pro Team 2026
Life in the fast lane

Rapha has this week unveiled its spring/summer Pro Team 2026 collection – the complete system built to carry you to your limit. This collection can be seen as the physical embodiment of Rapha’s relentless obsession. A refinement of its pinnacle performance range, designed not as separate pieces, but to work in seamless harmony.

Rapha Pro Team is sharpened at the highest levels of the sport to make sure you find your edge. A proven advantage, vindicated by elite athletes, the collection caters to whatever hard yards you have planned. From essentials for your intervals to high-velocity racewear over any distance, on any terrain, each component is meticulously developed for its specific effort.

Closing the gaps

For the new season, Rapha has filled gaps in its range with products like the Pro Team Wind Jacket – a lightweight, breathable garment with stretch panelling for race fit. Perfect for early mornings and highly packable, this is the Pro Team version of its popular existing wind jacket.

For the first time, Pro Team Cargo Bibs are now available outside of a special collection. With two pockets on the legs, a Pro Team chamois with perforated top sheet and reticulated foam that conforms to the body and wicks sweat. They also feature debossed uppers.

Familiar favorites have also seen upgrades. The Pro Team Jersey II is designed for performance and hard efforts on hot days; moisture-wicking and quick-drying. Lightweight mesh sleeves give increased comfort and breathability, and the 2026 fit is more engaged than previous iterations. The Pro Team Training Jersey III has also been updated with a refined, engaged fit and longer sleeves.

Pro Team Training – Made to Move Over and Over Again

Built to withstand the relentless demands of your hardest training rides. High-stretch fabrics provide a supportive, second-skin fit that remains locked in for unrestricted movement and all-day comfort. Serious mileage is supported by evolved bib shorts, featuring a Pro Team Training Chamois and an exclusive fabric designed to endure the rigour of repeated efforts. New lightweight leg grippers offer improved thermoregulation during high-intensity intervals.

Key products: Pro Team Training Bib Shorts, Pro Team Training Jersey III, Pro Team Long-Sleeve Lightweight

Pro Team Cargo – Made to Move Further, Faster

New for 2026, integrated pockets on each leg of the new Pro Team Cargo shorts mean you can be self-sufficient at high speed, easily fitting food, fuel or your phone. Featuring a best-in-class chamois for maximum comfort on prolonged days, as tested by professional riders. Designed to be worn as a system with the Pro Team Jersey II, these are the components you’ll need to maintain the pace on your longest, fastest rides.

Key products: Pro Team Cargo Bib Shorts, Pro Team Jersey II, Pro Team Wind Jacket

Pro Team Aero – Coming Soon

A result of obsessive reduction, the Pro Team Aero system is made to move quicker than ever before. 2026 sees the return of the Pro Team Long Sleeve Aero Jersey, meaning you can carry your speed over to cooler days. Featuring wind tunnel certified, proprietary fabrics and proven on the podiums of the WorldTour, every thread, seam and dimple is poured over, resulting in our most rapid jersey and bib short combination.

Key products: Pro Team Aero, Pro Team Long Sleeve Aero

Availability

Nearly the entire range is now available at Rapha.cc either individually or in bundles.

Cervélo Caledonia Family
Made for “big, stupid rides”

Cervélo just dropped the 2026 refresh of the Caledonia and Caledonia-5, and the message is clear: the “all-road” endurance category isn’t just about surviving long rides—it’s about smashing them. Born from the demand for a bike that handles the speed of a WorldTour racer with the compliance of a Paris-Roubaix specialist, the new Caledonia siblings have been refined to be lighter, cleaner, and even more versatile.

These bikes are built for what Cervélo affectionately calls “Big, Stupid Rides”—those days when you aren’t sure where the pavement ends and the adventure begins.

Caledonia-5: The Integrated Flagship

The “5” is the high-performance thoroughbred of the family. It’s the bike you’ll see under the pros when the roads get rough. For 2026, it gets some clever “trickle-down” tech from the Áspero gravel racer, including dropped seat stays for improved vertical compliance and a new in-frame storage compartment tucked into the downtube for your flat kit.

• Key Difference: Full internal cable routing, a D-shaped steerer, and premium carbon layups
• Colors: Emerald / Cream or Vanilla / Cherry

Caledonia: The Mechanic’s Darling

The “standard” Caledonia is the workhorse. It shares the same geometry as the 5 but opts for a more practical approach to integration. It features a new semi-external cable system that ducks under the stem, giving you the clean look of an aero bike while allowing home mechanics to swap stems or adjust stack height without bleeding the brakes.

• Key Difference: Slightly different carbon layup, external seatpost clamp (round 27.2mm compatibility), and no internal storage
• Colors: Nightshift or Mocha

Key Specs: At a Glance

Geometry: Built for Stability and Speed

Both bikes share a geometry that is “calmer” than the R5 but punchier than a dedicated gravel bike. For 2026, the fork offset and front-center have been tweaked by a single millimeter to perfectly balance the handling around higher-volume tires.

Caledonia & Caledonia-5 Geometry Chart (mm)

Availability & Pricing

Both models are available now through authorized Cervélo retailers globally and select online partners. Whether you are looking for a top-tier WorldTour-ready build or a reliable daily mile-muncher, the range covers a broad spectrum of budgets.

Caledonia-5 Build Options:

• SRAM Red AXS: $12,750
• Shimano Dura-Ace Di2: $12,500
• SRAM Force AXS: $9,000
• Shimano Ultegra Di2: $8,950
• SRAM Rival AXS: $7,400

Caledonia Build Options:

• SRAM Force AXS: $6,500
• SRAM Rival AXS: $4,850
• Shimano 105 Di2: $4,500
• Shimano 105 Mechanical: $3,300

The Bottom Line: If your rides are defined by high speed, clean lines, and integrated “free” speed, the Caledonia-5 is the dream machine. If you value easy maintenance, a threaded bottom bracket, and a more accessible price point without losing that legendary Cervélo ride quality, the Caledonia is the smartest choice in the stable.

Note: If you have other experiences with gear or something to add, drop us a line. We don’t claim to know everything (we just imply it at times). Give us a pat on the back if you like the reviews or a slap in the head if you feel the need!

PezCycling News and the author ask that you contact the manufacturers before using any products you see here. Only the manufacturer can provide accurate and complete information on proper/safe use, handling, maintenance, and or installation of products as well as any conditional information or product limitations.

The post Gear Break – Into Spring: Shimano Tiagra, Specialized Cotton TLR, 4iiii Viiiiva HRM, Liv Helmets, Rapha Pro Team, Cervélo Caledonia appeared first on PezCycling News.