Originally Posted by
acidfast7
Sorry man. I like you,and have a modicum of respect for you, but your wrong.
There's already one example of an HS420 is this thread that is dead on. 39.1mm with a 40 ETRTO width rating (which is tyre width and not bead to bead width.)
My guess is that most users here are not using the ETRTO but this old system with inches or the 700c system, which is also not the same.
Several Schwalbe tyres will be 700x32c but 35-622 and will measure that size exactly. The is very true for tyres over 2 inches in width.
I think most people in this thread are incorrectly using (the needlessly unfortunately complicated) two non-interchangable measurement systems.
Thus, I challenge people to actually post the ETRTO and the actual measurement of the width with a caliper and let me know how it goes.
I will do this on the next day that I ride into work to demonstrate that Schwalbe does keep it within ±1 mm of the ETRTO.
Has anyone ever convinced you that you're wrong by saying "your wrong" or even "you're wrong?" It's not a very good argument method.
I have more experience than you do. I've fixed thousands of other people's bikes. Tire sizes vary from their ratings. This is where theory and practice diverge. Read all you want, but take measurements also.