[Bizikleto]

Hi there,

Does anyone know why tyre sizes do not conform to standard actual sizes? I'm always deceived when I get a new tyre, measure it and the gauge always yields a 2-4-mm-downsized figure! :mad: compared to the tyre sidewall label (this usually is true for high-end tyres). The thing can happen the other way round when you get fatter than labelled tyres (usually in low-range ones). It can't be lack of manufacturing precision, because in case of car tyres, what you buy is what you looked for in terms of profiles, widths and so on. This is an issue when bying tyres on the Internet for example, because you don't know the actual size until you have it clinched and inflated on your rim.

It doesn't seem to be a concern to cyclists in general and cx-ers in particular. If this starting point is not met, there's no way of making manufacturers do a serious job.

Ride the trails anyway.

[The BikeForums Team]

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[alanbikehouston]

With road bike tires, a tire marked "28" is actually a "25". A tire marked "25" is actually a "23". The reason for this is road bike riders (bizarrely) assume that between any two tires, the "lighter" tire is the better tire. What is the cheapest way to take weight off a size 25 tire? Don't bother. Just mark a light size 23 tire as "25", and you have the world's lightest size "25" tire.

So, because my preferred size is "25", I buy tires marked "28". The bike industry assumes all bike riders are morons. But, eventually, most bike riders catch on to their silly marketing games.

[Bizikleto]

Right, we can switch up to fatter tyres, but we end up paying more (money) for less (size, quality). Ain't that another way of being a moron? Chst. :(