Stan’s NoTubes Grail CB7 and MK3 wheels roll out

Designed for tubeless road/gravel tires and disc brake-only use

News Wheels
Stan’s NoTubes Grail CB7

Stan’s Grail CB7 rims and wheelsets are optimized for tubeless tires and designed for disc brake-only use. Photo by Stan’s NoTubes

Four years after the original Grail rim was one of the first wheelsets to bring tubeless technology to road, gravel, and cyclocross bikes, Stan’s NoTubes has announced the new Grail CB7 and Grail MK3 rims and wheelsets. Designed for tubeless tires and disc brake-only use, the Grail CB7 and MK3 claim to offer the coveted blend of low weight, reliability, control, and comfort.

Grail CB7

The Grail CB7 rim is designed for 25-40mm tires and a maximum pressure of 85 psi with a 25mm tire. It uses Stan’s low-profile rim shape, and has a claimed weight of 300g. This lowered rotational weight is the most important and noticeable area of weight savings on a bike, and can be a serious advantage on climbs.

Stan’s NoTubes Grail MK3

Stan’s Grail MK3 wheelsets are built around Stan’s Neo Durasync hubs. Photo by Stan’s NoTubes

The Grail CB7’s 21.6mm internal rim width is aimed at creating a more stable base and optimizes tire shape for improved cornering stability and handling. The shape of the Grail CB7 keeps larger tires from folding over on the rim, even under the lower pressures and hard cornering of cyclocross and gravel races. The Grail CB7’s rim shape also helps prevent tire pinch flats and makes tubeless setup faster, easier, and more reliable, says Stan’s.

Incorporating Stan’s radial impact absorbing carbon technology (RiACT), the Grail CB7’s low-profile shape and carbon layup work together to absorb road vibrations and distribute impact. The RiACT rim shape and layup process also are claimed to allow the Grail CB7 to soak up vibrations.

Stan’s NoTubes Grail CB7

Stan’s Grail CB7 wheels ride well on and off pavement. Photo by Stan’s NoTubes

The new Grail CB7 wheelset has already claimed a major podium with Geoff Kabush’s third place finish this weekend at the 2018 Dirty Kanza, a self-supported, non-stop, 200-mile-long endurance race on the gravel and dirt roads of the Flint Hills region in east-central Kansas.

Grail MK3

The Grail MK3 is designed for 25-40mm tires and a max pressure of 110 psi with a 25mm tire. Based on the original Grail rim shape, the new MK3 rim features 6069 aluminum construction and weighs a claimed 440g. Lighter than the original Grail, the new Grail MK3 is also stronger, laterally stiffer, and more resistant to dents.

Stan’s NoTubes Grail MK3

Lighter than the original Grail, the new Grail MK3 is also stronger, laterally stiffer and even more resistant to dents, making it ideal for longer rides both on and off the pavement. Photo by Stan’s NoTubes

Slightly narrower than the carbon CB7 model, the Grail MK3’s versatile 20.3mm internal rim width and reinforced, low-profile sidewalls are built to handle the higher pressures of tubeless road tires, low-pressure tubeless converted tires and conventional tires with tubes. Like all Stan’s tubeless rims, the shape is aimed at offering a more secure connection and airtight seal when used with tubeless tires.

Wheelsets

Complete Grail CB7 wheelset options include a 1277g Pro model featuring Stan’s precision CNC-machined Neo Ultimate Speedsync hubs with hardened steel ratchet and five-degree engagement, Sapim Laser spokes and Sapim Secure Lock alloy nipples. The 1360g Grail CB7 Team wheelset includes Neo Durasync hubs with 10-degree engagement, Sapim Force spokes and Sapim Secure Lock alloy nipples.

Stan’s NoTubes Grail MK3

The Stan’s NoTubes Grail MK3 has an internal rim width of 20.3mm. Photo by Stan’s NoTubes

The Grail MK3 will be offered in a single wheelset weighing 1675g and featuring Neo Durasync hubs, Sapim Laser spokes and Sapim Secure Lock alloy nipples.

Grail CB7 and MK3 wheelsets will be available with custom decal color options and multiple build configurations as a part of Stan’s Custom Wheel Builder at notubes.com/custom-wheelset. And Grail CB7 rims are covered under Stan’s two-year carbon warranty program. Owners who register their wheelsets get five years of warranty coverage. All registered carbon rims and wheelsets are also covered by Stan’s lifetime crash replacement. Grail MK3 rims come with a two-year warranty and one year of no-fault crash replacement.

Stan’s NoTubes Grail CB7

Optimal tire size is from 28-40mm. Photo by Stan’s NoTubes

Grail CB7 – Pro and Team Specifications
  • Uses: Gravel, Cyclocross, Road
  • Internal Rim Width: 21.6 mm
  • External Rim Width: 26.4 mm
  • Rim Depth: 19.3 mm
  • Optimal Tire Sizes: 28-40 mm
  • Hubs: Stan’s Neo Ultimate with Speedsync 24-hole Front, 28-hole Rear (Pro); Stan’s Neo with Durasync 24-hole Front, 28-hole Rear (Team)
  • Spokes: Sapim Laser Black 1.8/1.5/1.8mm (Pro); Sapim Force Black 2.0/1.7/1.8mm (Team); Nipples: Sapim Secure Lock Alloy Black
  • Wheel Weight: 1277 g (Pro); 1360 g (Team)
  • Rim Weight: 300 g
  • Max Tire Pressure: 85 psi (25mm), 70 psi (32mm), 55 psi (40mm)
  • Max Rider Weight: 86 kg or 190 lb (Pro); 104 kg or 230 lb (Team)
  • Price: Pro Wheelset – $1635 | Team Wheelset – $1399 | Rim – $600
Stan’s NoTubes Grail MK3

Evelyn Dong cruises on pavement while riding Stan’s Grail MK3 wheels. Photo by Stan’s NoTubes

Grail MK3 Specifications
  • Uses: Gravel, Cyclocross, Road
  • Internal Rim Width: 20.3 mm
  • External Rim Width: 24.0 mm
  • Rim Depth: 24.5 mm
  • Optimal Tire Sizes: 28-40 mm
  • Hubs: Stan’s Neo with Durasync 28-hole Front, 28-hole Rear
  • Spokes: Sapim Force Black 2.0/1.7/1.8mm
  • Nipples: Sapim Secure Lock Alloy Black
  • Wheel Weight: 1675 g
  • Rim Weight: 440 g
  • Max Tire Pressure: 110 psi (25 mm), 70 psi (32 mm), 55 psi (40 mm)
  • Max Rider Weight: 104 kg or 230 lb
  • Price: Wheelset – $699 | Rim – $105

Grail CB7 and MK3 rims and wheelsets will be available from dealers, distributors and directly from notubes.com this month. Their release follows the more economical Grail S1 wheelsets that were launched in 2017.

To learn more roll over to www.notubes.com.

Photo Thumbnails (click to enlarge)

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