Originally Posted by
clubman
General searches for "Abrosio 19 Elite rims tires too tight" will generate lots of quality hits. Many of us have broken tire irons getting tires on the rims.
Ambrosio 19's are "big". I think the problem is the ultimate radius beyond the bead seat diameter, BSD, not ERD which is more used with spoke length calculation. Your best hope is to make sure both beads at one side of the rim are as deep in the spoke trench as possible and keep them there on both sides as you work your way around.
Here is an explainer:
http://www.sheldonbrown.com/tire-sizing.html
Not all 700c tires are exactly the same, some are tight no matter the rim. I forget which tires are large at the bead.
A telling comment, I bought a set of NOS rims off ebay once and taped to the outside of my rims were a pair of very lightly used Ambrosio 19's. I got them for free basically, now you know why.