3 mm chainwheel spacers (set of 5).
For budget road-to-fixed conversions, a quick and dirty way to make the chainline work is by spacing the chainwheel inward from the crank spider.
This is especially useful if you're using a hub made for a multi-speed freewheel, because it reduces the amount of re-dishing required.
These also take up the space formerly occupied by the second chainring, so if you use these, you don't need to buy short chainring bolts...use the same bolts you were using for your double chainring set.
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