First time posting here, and thanks to everyone for helpful information while I was reading under the radar.
As an introduction, I have been riding my Schwinn Le Tour for the past 3 years and have decided to try building up a single speed piece by piece. The frame that I found for cheap on craigslist turned out to be a Ross (I'm thinking Gran Tour II due to the 'safety fork tips' and lack of frame shifters, maybe '82) which I thought was a bit quirky at first, but it's my size and I like steel. After sizing it up with a ruler -and not a caliper- I settled to buy some parts online to adapt the stem, and a seatpost. I had already found a cheap 31.8 handlebar, so my backwards workflow was to adapt the frame to fit the 31.8...
My frustration currently comes from the final realization that the stem is 21.15 mm and seatpost as 25.0 (or smaller.) I had thought that 22.2 stem (to adapt up to 28.6 for a 'threadless stem') and a 25.4 seatpost were relatively standard and probably the smallest I could go for my goal of modernizing this bike.
TL;DR: Dimensions on my Ross frame keep turning out to be not-so-standard.
Am I going about this the completely wrong way?
Do I need to settle for a shiny 21.15 quill stem and toss the hopes of using a 31.8 handlebar?
Is the Ross frame worth all this?
Should I be afraid of future 21.15 stems?
Thanks in advance for any tips!