Stans No Tubes Grail MK3 700c Rims

The Grail MK3 rim is designed to let you ride without limits. Whether you’re rolling on fresh asphalt, crushing big gravel miles, or racing cyclocross, the Grail MK3 is ready to outperform the competition. Light, strong, and laterally stiff, the patented shape and 6069 series aluminum construction of the Grail MK3 makes it ideal for longer and more difficult rides both on and off the pavement. Stan’s patented tubeless technology can seal most punctures while you ride, for unmatched durability and peace of mind on every ride. The Grail rim’s versatile BST-R design is compatible with tubeless road tires, low-pressure tubeless converted tires, and conventional tires and tubes. The rim’s patented shape offers a more secure connection and airtight seal with tubeless tires and improves tire stability for superior handling in all conditions.

The Grail MK3’s internal width and patented Bead Socket Technology rim design are optimized for 25-40mm tires. The truth is out that wider is faster, and the shape of the Grail MK3 rim lets you get the most speed from your tires, while also improving tire stability at speed and control in the corners. Nothing beats Stan’s patented tubeless rim design for getting the most performance from your tires.

All the advantages the Grail MK3 offers on the road are even more noticeable once the pavement ends. For cyclocross and gravel racing, the optimized tire shape and added stability offer a distinct advantage. The Grail MK3’s rim shape is even designed to avoid tire pinch flats, allowing ‘cross and gravel racers to run lower pressures that absorb impacts and improve traction.

No matter where your rides take you, choose the most trusted tubeless technology in the world. With the Grail MK3, there are no limits.

Technology

Tubeless Technology For Higher Pressures

Our BST-R rim shapes are designed for maximum versatility, and can be used with a wide range of tires. Higher volume tires 32mm to 50mm wide can be used at pressures up to 45psi (3.1 bar). The BST-R rim shape can also be used with 25mm to 32mm road tires specifically designated as "tubeless" at pressures up to 115psi (7.9 bar). BST-R rims can also be used with tubes, at pressures up to 115psi.

The patented design of our BST-R rims secures the tire's bead, creating an air tight seal that lets the tire expand to its full volume. The result is more traction and less rolling resistance for increased speed.

Key Differences Between BST And BST-R

Our BST system was developed specifically for tubeless use with pressures below 45psi. From our Iron Cross to our Hugo, we offer low pressure BST rims for tires in the 32mm to 122mm width range. The broader pressure range of our BST-R Series rims and wheelsets means they're optimized for tubeless use with tires in the 32mm to 50mm range at pressures of 45psi or lower, as well as 25mm to 32mm tires specifically designated as "tubeless" that feature reinforced beads designed for pressures up to 115psi. Both BST and BST-R rims and wheelsets may be used with tubes.

Features

• Light and laterally stiff design optimized for disc and tubeless tubes
• Durable and light 6069 aluminum construction
• Patented BST-R tubeless rim inflates easier and offers a more secure tire fit
• 20.3mm WideRight rim design improves cornering and stability and lets tires roll faster
• Optimised for 25-40mm disc road, gravel, and cyclocross tires
440g

Specification

• Rim Internal Width: 20.3mm
• Rim External Width: 24.0mm
• Rim Depth: 24.5mm
• Hole Count: 32-hole
• Rim Material: 6069 Aluminum Alloy
• Brakes: Disc Only
• ERD: 589mm
• ETRTO: 622 x 20.3mm
• ISO: 700c x 24.0mm
• Tape: 21-25mm (2x)
• Valve: 44mm PV
• Max Spoke Tension: 125kgf (1225N)
• Max Pressure with 25mm Tire: 110psi
• Max Pressure with 32mm Tire: 70psi
• Max Pressure with 40mm Tire: 55psi
• Rim Weight: 440g