R21-40 All-Round Road Rim 700c

The R21-40 features 21mm inner width (suits 25~28C tires) and all-round 40mm depth. Suitable for flat road and hill climbs. The default rim weight is 360g, passing in-house UCI impact test of 100J. Open for weight and strength customization for a lighter version for light riders or a reinforced version for aggressive cycling.
Model
R21-40
ETRTO
622-21
Inner Rim Width
21mm
Outer Rim Width
26.4mm
Rim Depth
40mm
Offset
0mm (Symmetric)
Weight
360g (Standard)
Hole
20H/21H/24H (Customizable)
ERD
560mm
Discipline
All Road
Impact Standard
100J (Standard)
Rider Weight Limit
130kg (Standard)
Max spoke tension
135kgf (Standard)
Tire Size
25C-30C
Max Tire Pressure
120psi/8.27bar (Standard)

Product Testing

Impact Test

Impact Test

Our impact tests follow UCI standards for road, cyclocross, and gravel wheels—performed without tires. For MTB wheels, tests are conducted with tires mounted to simulate real-world conditions. Impact standards for private label products can be fully customized.
Stiffness Test

Stiffness Test

We measure both vertical and lateral stiffness to assess how the rim performs on specific terrain and the ride feel it delivers. A static force of 30kgf (lateral) and 50kgf (vertical) is applied to the rim during testing. Test conditions can be customized to meet your product or market requirements.
Tire Inflation Test

Tire Inflation Test

Strong tire retention under high pressure is a key indicator of rim quality. During testing, the rim width variation must remain within 0.2 mm to ensure consistency and safety. Test parameters can be customized to meet specific customer requirements.
Wheel Building Test

Wheel Building Test

A rim is only one part of the wheel system. We verify drilling angles, stiffness, and rim geometry to ensure seamless integration with spokes, hubs, and nipples.
Spoke Pull-Through Test

Spoke Pull-Through Test

Spoke holes are critical stress points. Each new rim design undergoes pull-through testing to ensure proper reinforcement. The minimum pull-out strength must exceed 320kgf to pass.
Greenhouse Test

Greenhouse Test

The Greenhouse Test is designed to simulate extreme conditions, such as when a wheel and tire assembly is exposed to high temperatures during transport in direct sunlight. This test is conducted in accordance with ISO 4210-7:2023, section 4.4.

Customization Services

We offer a wide range of customization options to help your rim and wheel products stand out — even when using shared open molds. From layup structure and stiffness tuning to surface finishes and branding, our private labeling solutions give you full control over product identity and performance.
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