bike tires have a manufacturer's specified width, but it's very common for the actual width of any given model to be 1-3mm wider for competition purposes, ther

bike tires have a manufacturer's specified width, but it's very common for the actual width of any given model to be 1-3mm wider for competition purposes, there may be maximum widths (depending on the exact rules, more like 33-38mm), not based on the label but measured directly