That efective tire width, when mounted and inflated depends on rim width, it's an uber obvious thing. It's so obvious that discussing about it will only make sense for people who started cycling yesterday. The problem here is that the declared width is not consistent and there is no standard. A tire width size should be declared and measured with the tired mounted in no rim, because a tire width should be a measure of the tire ONLY, not tire+rim combo, because when i shop tires, I don't shop for tire+rim, therefore I am not interested on that combo dimension. I´m shopping on a tire, and tire sizes should be consistent between manufactures, and right now it is not. The "ruler" used to measure tires is something like this one here:Etienne wrote: ↑Fri Nov 01, 2019 6:39 pmInconsistency in road tire sizing among brands is a fact ... just read here on this very forum all the threads about the sizes of Schwalbe, Conti etc. even on relatively narrow (by today standards) 17-19mm rims ... Conti even changed completely the sizing when going from the GP4K to GP5K ... and yes, Veloflex seem to be one of the rare brands that gives a true size for a standard road rim, what's the problem ?InDustWeTrust wrote: ↑Fri Nov 01, 2019 1:00 pmOk then, so veloflex tires are spot on, and any other single tire manufacture in the world is completely wrong...jeanjacques wrote: ↑Thu Oct 31, 2019 8:39 amOr other manufacturer sell wider tire than advertised (or just inadapted to modern rim, there 28 are 28mm on 13mm rim), this leads to tire clearance problem, incomprehension about tire size, etc.
Veloflex are spot on, a 28c tire have to be 28mm on the average rim, 17mm intern and Veloflex 28 are exactly 28mm.
One thing is for sure, tire size is already stablished for many years ago, and it's completely rim width independent, otherwise it would be crazy. Tire size is measured on the tire, unfolded, flat, period. For both mtb and road. Do your homework.
So yes, the best way to predict tire size on a specified rim is probably to measure the tire's width when flat ... but for that you are supposed to have the tire in hands and that is not always possible unless you have very deep pockets full of cash, so please don't be so dismissive
https://www.wheelfanatyk.com/blog/wheel ... ire-sizes/
When you measure something in milimiters, the size of a milimiter is worldwide a standard, doesn't depend on anything else. Thsi whole tire thing size standard nowadays is a joke, that's why if you want a veloflex in "28", you will need a veloflex "30" and that is not produced.
If I shop for bar tape, well, bar tape in a 36cm bar will be smaller than in a 46cm bar, what a surprise!!!! but if I shop bartape, I want to know the length I am buying, if it will be bigger or smaller depending on in which bar I mounted, it's so obvous that doesn't need to be specified. But if I am buying 2 meters of bar tape, 2 meters it is, period.
If I buy a 25mm tire, and I want to mount it on a 29" DH rim with 38mm internal witdh, it might measure 38mm in that bike, but the tire size is 25, not 38.
When I buy a chain, chain length is measure in the number of links. A certain bike will have a certain chainstay length, and then you have chainring size, cassette, etc... but chain length is specified in total links numbers. makes sense.