That is, if you have a 32T chainring up front, you should start with a 16T cog out back. That said, if you want to get started on a single speed and you don’t have time to over analyze everything like me, the age old starting gear ratio for a 26″ mountain bike is 2:1. What works on one race track may not work as well on another.What works for you may not work for someone else. ![]() The efficiency of a ratio changes with each wheel size.Ratios are a good starting point but gear inches are more accurate.I’ll try and summarize a few things here for those who don’t want to read the whole post: ![]() Thankfully, Surly Bikes have written an awesome article on single speed gear ratios and gear inches. Please note that chain tension and chainline is crucial if you are going to use ramped rings and cogs, so keep that bike maintained! Single Speed Gear Ratio and Gear Inches It is a short term solution and you will experience shorter chain life. While I have used both in ghetto single speed conversions, I recommend against it. This is great for a 2x or 3x drivetrain when we want the chain to change between rings but isn’t ideal on a single speed drivetrain. Ramped and pinned chainrings are designed to create a smoother shift between rings. What are ramped and non-ramped chainrings and cogs?
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