8, you at least have a useful deciphering reference. The rim diameter is 622mm and rim + tyre outer diameter is around 700mm (the total outer diameter will depend on the height of the specific tyre used).
2 Oct 2012 A traditional 700c tyre has an inner diameter of 622mm, a 26-inch mountain bike tyre is 559mm, and a 29-inch mountain bike also has a 622mm diameter. So on a tyre wall you will also find bead measurements; for example, 23-622, meaning the tyre's inflated width is 23mm, and its internal diameter is 622mm.
Some rims are also now marked according to ISO with their bead diameter and internal section (width where the tyre fits): e.g. 622–17 for the size usually fitted to touring and hybrid bikes. If the rim is not marked with its bead diameter you can read this from the tyre – it's the one dimension they have in common.
12 Mar 2017 'Plus+' sizing tyres is the latest trend in mountain bike tyres. It's basically increasing the height of the tyre sidewall of a given wheel size to give it the roll-over traits of the next wheel size up along with a gain in tyre width to add an aggressive high-traction character. Plus+ size tyres fill the gap between
Should you use 23mm or 25mm road bicycle tyres? Or even 28mm? - There are two factor to consider here: the first is what will fit on your bike and its wheels, the second is what is best for speed and comfort. 1. You need to consider your wheel rim width, and your frame size. To get the best feel and fit, the tyre must be wider
Here's how it works: Let's start with the 26 x 2.125 size that became popular on heavyweight "balloon tire" bikes in the late '30's and still remains common on "beach cruiser" bikes. This size tire (This system was formerly known as the "E.T.R.T.O." system, developed by the European Tyre and Rim Technical Organisation.).

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March 2018