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27″ Tire Guide

If you’ve purchased a new bike in the past 20 years, chances are you have 700c wheel on a road bike, or 26″ wheels on a mountain bike or cruiser. For a period in the late 70s and into the early 80s, 27″ was a popular wheel size on road bikes in the US and British market. If you have a 10 or 12 speed bike from this era, chances are you have this size wheel. (information via Harris Cyclery)