Wheel Lateral Stiffness and Deformation Testing

Lateral stiffness is a crucial measure of a wheel's ability to resist sideways deformation when subjected to external forces. This property is particularly important in high-performance cycling activities like sprinting and cornering, where the rim must maintain its shape and structural integrity under sudden, high loads.

Test Standard

At NTP, lateral stiffness testing is not required for every product. Instead, we tailor the stiffness requirements to each client's specific needs, based on the intended use and target audience of the wheel. Some clients also request comparative tests to evaluate new wheel designs and configurations. It’s essential during testing that no plastic deformation or damage occurs to the rim or wheel components.

Test Goal

The primary goal of lateral stiffness testing is to predict how the completed wheel will perform with all its designated components assembled. This helps our clients verify their new wheel designs, including lacing configurations, spoke types, and component choices, ensuring the final product delivers the desired performance.

Test Equipment

We use a Universal Testing Machine (UTM) for lateral stiffness testing, which also serves for our rim stiffness tests. The UTM is equipped with a rigid base and a clamping system that securely holds the hub through the axle. Above the rim, a compression fixture applies gradually increasing force. As the load increases, sensors monitor rim deformation, and this data is fed into a computer for analysis.

Moving Speed	Test Spots	Applied Forces	Test Side
0.4m/s	Four key points around the rim (3, 6, 9, and 12 o'clock positions), with maximum load applied at the valve side (6 o’clock position).	5kgf, 10kgf, 15kgf, and 20kgf, based on client specifications.	Single Rim Side

Test Method

Step 1: Assemble the wheel according to the client’s specifications, ensuring it is properly tensioned, trued, and de-stressed.

Step 2: Label the four test positions on the rim (3, 6, 9, and 12 o'clock).

Step 3: Clamp the wheel onto the testing rig, ensuring the test spot is positioned below the compression fixture.

Step 4: Using a remote control, lower the compression fixture until it contacts the rim edge at the designated test spot.

Step 5: Gradually apply force at a controlled speed, increasing it up to a preset limit.

Step 6: After completing the test at the first spot, lift the compression fixture, rotate the rim to the next test spot, and repeat the process with progressively lower forces (15kgf, 10kgf, etc.). Continue this for all four test spots.

Step 7: Once all tests are complete, export the deformation data from the computer for analysis.

Sample Test Report

Example Profile

Model	Size	Width	Depth	Weight (Stated)	Measured Weight
R23-60	700C (622-23)	23/28.5mm	60mm	420g	425g
Hub	Position	Hole	Spoke	Lacing	Spoke Head
Client’s branded hub	Rear	24H	Pillar PSR X-TRA 1420	2X (spokes touching)	Straightpull

Test Results

Test Spot	Force Applied	Deformation	Lateral Stiffness
#1: 6 o’clock (valve side)	20kgf	4.36mm	44.95N/mm
#2: 9 o’clock	15kgf	3.13mm	46.94N/mm
#3: 12 o’clock	10kgf	1.78mm	55.06N/mm
#4: 3 o’clock	5kgf	0.48mm	102.08N/mm

In this example, the wheel shows premium lateral stiffness across the wheel under high and low forces. The results demonstrate a high level of resistance to deformation, indicating the wheel's ability to maintain its shape and performance under load.

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Email: koko@ntpcomposites.com
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NexusTech Prime (NTP) Composites

Established in 2013 initially as an OEM carbon rim contract manuafacturer, NTP composites has grown steadily to be a full-service OEM and ODM service provider, with brilliant quality control, proficient engineering capability, and excellent customer service.

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