Originally Posted by
Jipe
The ETRTO table is and ISO standardized table defined by a panel of experts.
Well I am just a single source, but I have never seen that violating this table has had consequences. It does change the profile to a more round shape than U shape, but I can't see any problems. Now, if you over pressurize the tire, I could see that effecting the rim. If I run into problems I will post, but so far nothing. By the chart, Zizzo should have supplied rims with at least 17mm for the 40mm tires supplied.