The grips are sticky & need to be replaced. (I'm guessing that the material has degraded from exposure to the environment and the chemicals from the hands.)
The handlebars (carbon fiber) are about 0.875" diameter (a little over 22.2 mm).
Also measured the length of the grips on the handlebars.
It measures about 4.825" (about 122.5 mm).
I happen to have these orange foam grips already.
They're the correct size so I put them on for now.
First, I don't think they'll last very long (pretty soft/spongy foam).
And, T will probably not want them on there too long because of the color.
But for now, the bike can be ridden without getting all grossed out by the sticky grips! (very unpleasant to touch)