When you service a tandem, or, especially, when you set up a new one, you may notice that the tension on the synchronizing chain varies as the cranks turn. It may be quite tight when the cranks are in one position, and rather droopy after the cranks have rotated a bit. This is not good. Now with more tips on eccentrics and chainwheel selection. Tire Sizing For everyone who buys tires.
Bicycle tires come in a bewildering variety of sizes.
To make matters worse, in the early days of cycling, every country that manufactured bicycles developed its own system of marking the sizes. These different national sizing schemes created a situation in which the same size tire would be known by different numbers in different countries. This short article explains why. In the 1980s, I wrote a regular monthly column in Bicycling magazine, on maintenance and repair, particularly focussed on the selection and use of tools. While some of this material is rather dated, much of it isn't.