Objectives: This study compared an 85-tooth versus the standard 62-tooth chainring for power outputs during a Wingate test using a Velotron electromagnetically-braked cycle ergometer. Design: All participants completed trials using both chainring sizes in a repeated-measures cross-over design. Methods: Resistance-trained male participants (n = 20, 24.6 ± 4.5 years) performed two Wingate tests separated by at least 48 h. Peak power (PP), mean power (MP), fatigue index (FI), peak cadence, mean cadence, and total work (TW) were recorded. Results: Peak power was not significantly different (p = 0.10) between trials (62-tooth = 1111 ± 187 W vs. 85-tooth = 1188 ± 103 W). However, MP, mean cadence, and TW were significantly greater (p< 0.01) for the 85-tooth trial (869 ± 114 W, 131 ± 16 rpm, and 26,063 ± 3418 J) compared to the 62-tooth test (673 ± 136 W, 102 ± 24 rpm, and 20,199 ± 4066 J). Fatigue index was reduced during the 85-tooth trial (49.9 ± 9.1% vs. 61.6 ± 8.8%; p < 0.01). Agreement was poor with most ICCs ˜ 0.19 and large SEMs. Conclusions: The two options for chainrings on Velotron cycle ergometers should not be interchangeably used with the Wingate test software; the 62-tooth ring is recommended for most applications. Individuals who can attain peak cadence &gt;180 rpm have less variability and tend to achieve higher power outputs on the 62-tooth ring. We suspect that the manufacturer`s software limits peak cadence to 182 rpm when using the 85-tooth chainring.
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