Originally Posted by
eduskator
I would tend to agree with you.
Then again, tire pressure calculators are subjective and vary.
If I use the Silca one, my recommended pressure is around 75PSI. If I use the Giant one (Tire Pressure | Giant Bicycles), it's 65PSI. Giant has a ''hookless specific'' tire pressure calculator and factors in the inner rim width, while the Silca doesn't.
Who's right, who's wrong? I'm sure some of you will say that Giant's pressure calculator is full of crap and only meant to help sell their products. At 170lbs, I used their hookless wheels for several seasons inflated at 65PSI on 28mm tubeless tires and never had any issues. Roads are in bad condition overall where I live and I hit tons of potholes. They felt as firm as my current setup (hooked rims & 28mm tubeless tires) inflated at 75PSI.
The total of your weight plus your bike's weight puts you in what seems to be a reasonably safe zone for road hookless. Recommended pressures for heavier riders are likely to be near the safe limit; in some cases, dangerously so, apparently.
What gets me is that hookless rims for road bikes had disappeared from the market entirely by the early or mid-'80's thanks to the obvious increase in safety at high pressures seen with hooked rims. Hookless for road bikes didn't return until carbon rims became fashionable and manufacturers discovered how complicated and expensive the tech would be.
Cutting through the claims of, e.g., 15 grams of weight saving from losing the hook, DT has said that they plan to continue manufacturing hooked carbon road rims for the foreseeable future because they don't mind spending the money required for production of those rims.