I'm sure the answer is out in my manual in the garage, which is snowed in. I want to put in 90 degree valve stem in for ease of reading and putting air in. Chrome of course, lol. What size is the hole for the valve stem. I emailed this Kurvygirl website, no reply yet. Had nothing to do, so thought I'd post while the wife is making me a martini. I'm busy watching Barrett Jackson, lol Thanks