A 29’er with a 28 tooth front chainring and 10-42 or 10-50 has a higher top end gear than your setupthat’s why some people are good with a 28 tooth ring.
10 tooth vs 11 tooth is a big difference and wheel size matters. I have a 32 tooth front chainring and 10-50 on a 29’er and can easily spin into the upper 20’s. To replicate the same top end on a 27.5 bike with 11 tooth you’re likely looking at a 38 tooth chainring.
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