Curve GXR 4 (Kevin v4)
Curve’s world-beating gravel bike – updated!
The titanium Curve GXR v4 – better known as Kevin – has been tested like no other bike, racking up thousands of kilometers on adventures across South America, New Zealand, Switzerland, Swaziland, and beyond. It has also proven itself on the world stage, with victories in ultra-distance gravel races across the globe.
The name “Kevin” began as a tongue-in-cheek jab at the bike industry’s naming conventions, but the nickname stuck. Today, it’s proudly stamped on the top tube of one of the most versatile adventure bikes out there.
The latest updates to Kevin mark its most significant evolution yet. With refined geometry, wider tyre clearance, improved mounting options, and full UDH compatibility, the GXR v4 is more capable, more adaptable, and more adventure-ready than ever.
Curve were building gravel bikes long before gravel cycling became its own category. Over the years, they’ve developed a broad range of high-performance options designed for every kind of gravel adventure – from fast, race-ready 700c builds to rugged, fat-tyred rigs built for bikepacking.
Every Curve bike is born from real-world testing and hard-earned experience. Their machines have been torture-tested in the toughest bikepacking races on earth, including Race to the Rock and the Rhino Run, proving their reliability where it matters most.
The latest Curve GXR v4 has been fine-tuned to deliver a balanced fit and consistent ride quality across all sizes. Longer chainstays now provide clearance for larger tires, with the stays scaling proportionally with frame size—so taller riders enjoy the same stable handling and ride feel as smaller frames.
Stand-over height has been lowered across the range, making it easier to get on and off the bike in any size.
Up front, the new Curve 415 VGM Fork introduces a 15mm longer axle-to-crown measurement. To keep the fit dialed, Curve has adjusted head tube lengths accordingly, paired with a sleek integrated headset. The result is a slightly higher stack that supports a “slammed” front-end look while still offering long-ride comfort. Riders preferring a more upright position won’t need an excessive stack of spacers—just a cleaner, more versatile fit out of the box.
The Curve Ride 415 VGM fork has taken load carrying to the next level, with a whopping 8kg rating on each fork leg. That’s a total carrying capacity of 16kg. Featuring three cleverly designed mounts on each fork leg, the Ride 415 VGM fork can accommodate anything from extra water bottles to micro-panniers or fork-specific bags.
While many riders favour 1x drivetrains, the Curve GXR can be set up with a 2x drivetrain without any hassle. With SRAM UDH compatible dropouts, Kevin is able to handle the widest range of groupset options currently available.
The GXR v4 has been designed with gravel cycling versatility in mind. While the new geometry is optimised for 700c x 45mm tyres, you can go as wide as 50 mm tyres on 700c wheels. In 700c mode with narrower tyre options, the Kevin is ready for fast gravel missions, but you’ll be surprised how capable it is on chunkier terrain with a 50 mm tyre. With 650b (27.5”) wheels you can move into gravel-plus territory with 2.2” tyres which offer plenty of comfort for the most rugged gravel adventures.
The Curve GXR v4 comes equipped with rear rack mounts, fender mounts, 3 x bidon mounts, and top-tube “bento mounts”. With extra tyre clearance, and a comparatively long wheelbase for the gravel genre, which offers a more stable platform, the Kevin is ready for epic day rides or multi-day bikepacking adventures, not just smooth gravel cruising. There is ample room for bikepacking bags on all frameset sizes.
Curve Kevin Custom
All Kevins start out as a bare frameset initially, for building up into a complete bike with suitable components of your choice. Below are sample custom builds that we can offer ‘off the peg’ or use as a start point for further customisation.
Curve Kevin GRX 600 12s – £4,449
Specification
Components below are for a GRX600 1x12s set up. Also available at the same price with a 2x12s set up.
FRAMESET: Curve GXR v4 Titanium
FORK: Curve Ride 415 VGM carbon fork
HEADSET: Curve Integrated 42/52 mm semi-internal
BOTTOM BRACKET: T47
SHIFT/BRAKE LEVERS: Shimano GRX 610 12-speed 1x
BRAKES: Shimano RX400 Hydraulic Disc, RT64 160mm rotors
FRONT DERAILLEUR: n/a
REAR DERAILLEUR: Shimano GRX 822 12s
CRANKSET: Shimano GRX 610 1x, 40T
CASSETTE: Shimano SLX 10-51 12-speed
CHAIN: Shimano SLX 12-speed
HANDLEBAR: Curve Walmer (with Curve Extra Long 3.2mm Bar Tape)
STEM: ZIPP Service Course
SEATPOST: ZIPP Service Course
SADDLE: Fabric Scoop Sport Radius
WHEELS: New DT Swiss G 1800 Spline
TYRES: Pirelli Cinturato Gravel M Performance TLR 700x45c or 50c
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
EXAMPLE WHEEL OPTIONS:
- Hope RX24 – add £239
- Hunt 35 Carbon Gravel – add £399
Curve Kevin GRX 800 12s – £4,899
Specification
Components below are for a GRX800 1x12s set up. Also available at the same price with a 2x12s set up.
FRAMESET: Curve GXR v4 Titanium
FORK: Curve Ride 415 VGM carbon fork
HEADSET: Curve Integrated 42/52 mm semi-internal
BOTTOM BRACKET: T47
SHIFT/BRAKE LEVERS: Shimano GRX 820 12-speed 1x
BRAKES: Shimano GRX 820 with Shimano CL700 160mm rotors
FRONT DERAILLEUR: n/a
REAR DERAILLEUR: Shimano GRX 822 12s
CRANKSET: Shimano GRX 820 1x, 40T
CASSETTE: Shimano XT 10-51 12-speed
CHAIN: Shimano M8100 12-speed
HANDLEBAR: Curve Walmer (with Curve Extra Long 3.2mm Bar Tape)
STEM: Ritchey Comp
SEATPOST: Ritchey Comp
SADDLE: Fabric Scoop Sport Radius
WHEELS: Hope RX24
TYRES: Pirelli Cinturato Gravel M Performance TLR 700x45c or 50c
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
FREE: Premium hand delivery by qualified mechanic of fully built bike, ready to rideEXAMPLE WHEEL OPTIONS:
- New DT Swiss G 1800 Spline – deduct £239
- HUNT 35 Carbon Gravel – add £159
- ZIPP 303 XPLR S carbon – add £379
Curve Kevin GRX 700 Di2 1x – £4,899
Specification
FRAMESET: Curve GXR v4 Titanium
FORK: Curve Ride 415 VGM carbon fork
HEADSET: Curve Integrated 42/52 mm semi-internal
BOTTOM BRACKET: T47
SHIFT/BRAKE LEVERS: Shimano GRX717 Di2, 12-speed
BRAKES: Shimano GRX410 Hydraulic Disc, CL700 160mm rotors
FRONT DERAILLEUR: n/a
REAR DERAILLEUR: Shimano GRX717 Di2, 1×12-speed
CRANKSET: Shimano GRX610 38T or 40T
CASSETTE: Shimano M6100 10-51T
CHAIN: Shimano M6100, 12-speed
HANDLEBAR: Curve Walmer (with Curve Extra Long 3.2mm Bar Tape)
STEM: ZIPP Service Course
SEATPOST: ZIPP Service Course
SADDLE: Fabric Scoop Sport Radius
WHEELS: Hope RX24
TYRES: Pirelli Cinturato Gravel M Performance TLR 700x45c or 50c
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
FREE: Premium hand delivery by qualified mechanic of fully built bike, ready to rideEXAMPLE WHEEL OPTIONS:
- New DT Swiss G 1800 Spline – deduct £239
- HUNT 35 Carbon Gravel – add £159
- ZIPP 303 XPLR S carbon – add £379
Curve Kevin Rival XPLR AXS 1x13s – £5,499
Specification
FRAMESET: Curve GXR v4 Titanium
FORK: Curve Ride 415 VGM carbon fork
HEADSET: Curve Integrated 42/52 mm semi-internal
BOTTOM BRACKET: T47 DUB
SHIFT/BRAKE LEVERS: SRAM Rival eTap AXS E1 13-speed
BRAKES: SRAM Rival eTap AXS, Paceline Centrelock 160mm rotors
FRONT DERAILLEUR: n/a
REAR DERAILLEUR: SRAM XPLR eTap AXS E1
CRANKSET: SRAM Rival AXS E1 1x, choice of sizes (38T-46T)
CASSETTE: SRAM Rival 10-46T 13-speed
CHAIN: SRAM Rival AXS Flattop
HANDLEBAR: Curve Walmer (with Curve Extra Long 3.2mm Bar Tape)
STEM: ZIPP Service Course SL
SEATPOST: Service Course SL Carbon
SADDLE: Fabric Scoop Sport Radius
WHEELS: Hunt 35 Carbon Gravel
TYRES: Pirelli Cinturato Gravel M Performance TLR 700x45c or 50c
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
FREE: Premium hand delivery by qualified mechanic of fully built bike, ready to rideEXAMPLE WHEEL OPTIONS:
- New DT Swiss G 1800 Spline – deduct £399
- Hope RX24 – deduct £159
- ZIPP 303 XPLR S carbon – add £219
Curve Kevin GRX 800 Di2 1x – £5,599
Specification
Components below are for a GRX800 Di2 1x12s setup – also available with a GRX800 Di2 2x12s setup (+£170).
FRAMESET: Curve GXR v4 Titanium
FORK: Curve Ride 415 VGM carbon fork
HEADSET: Curve Integrated 42/52 mm semi-internal
BOTTOM BRACKET: T47
SHIFT/BRAKE LEVERS: Shimano GRX825 Di2, 12-speed
BRAKES: Shimano GRX820 Hydraulic Disc, CL800 160mm rotors
FRONT DERAILLEUR: n/a
REAR DERAILLEUR: Shimano GRX827 Di2, 1×12-speed
CRANKSET: Shimano GRX820 40T or 42T
CASSETTE: Shimano M8200 10-51T
CHAIN: Shimano M8100, 12-speed
HANDLEBAR: Curve Walmer (with Curve Extra Long 3.2mm Bar Tape)
STEM: ZIPP Service Course SL
SEATPOST: ZIPP Service Course SL Carbon
SADDLE: Ergon SR Allroad Men/Women
WHEELS: Hunt 35 Carbon Gravel
TYRES: Pirelli Cinturato Gravel M Performance TLR 700x45c or 50c
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
FREE: Premium hand delivery by qualified mechanic of fully built bike, ready to rideEXAMPLE WHEEL OPTIONS:
- New DT Swiss G 1800 Spline – deduct £399
- Hope RX24 – deduct £159
- ZIPP 303 XPLR S carbon – add £219
