To perpetuate a tire thread, I'm ordering a new set of Bridgestone Spitfire S11s, along with new Bridgestone tubes. A question asked online is whether I want a TR-4 / TR-6 Straight metal stem (8mm dia.), or PV78 Tall 90 degree metal stem. I like the idea of using the 90 degree valve stems, and wanted to ask if anyone here has tried them, yea or nay. Getting to the straight stems with the snowflake wheels can be a wee bit difficult at times, or at least more so than a 90 stem, and using some pressure gauges would be much easier too. Thoughts?