Quality score: The quality score evaluates the spoke tension balance of the wheel, using the relationship between variance and average tension. A higher score indicates consistent tension distribution (low variability) and better wheel performance. It’s calculated separately for the drive and non-drive sides, then averaged for an overall score.
Consistency index: Consistency index measures how consistent your current wheel build is compared to your historical performance. This metric normalizes your quality score, providing insight into the steadiness of your builds over time.
Spoke efficiency index (SEI): The SEI measures the percentage of spokes that meet the builder’s target precision. It compares the number of spokes within the defined tolerance range against the total number of spokes in the wheel.
Stress index (SI): Stress index represents the stress put on a spoke and is calculated as a percent ratio between individual tension reading and mean value (average tension). It tells us to what degree (percentage) single spoke tension deviates from the average tension of a wheel side.
Range consistency score (RCS): The Range Consistency Score is an interesting metric to evaluate the uniformity of spoke tensions within a given range, and it can provide insight into how closely the tensions are grouped around the average value. A higher range means a greater deviation, lowering the score, which signals less consistency.
Precision chart: The TCS is a metric that measures the consistency of spoke tensions across the wheel, and it can help identify areas where the tensions are more variable. A higher TCS indicates greater consistency, while a lower score suggests greater variability.
Accuracy index (AI): The Accuracy Index (AI) tracks how closely the achieved average spoke tension aligns with the set target tension. It is calculated as the ratio of the average recorded tension to the target tension.
Spoke balance index (SBI): The Spoke Balance Index (SBI) measures the tension balance between the drive side (DS) and non-drive side (NDS) of the wheel. Ideal value depends on the geometry of the build; for symmetrical builds, it is close to 100%. For asymmetrical builds, it reflects expected tension ratios (e.g., 2:1 for road bikes).
Adjacent variability score: Adjacent spokes variability score measures uniformity of tension ratios from one to another spoke pair on the same side of the wheel. For the wheel to have a balanced tension, it is also vital that spokes on the same side have uniform tension to a good degree.
