I'm trying to get some Ti bolts, specifically for the sliding drop outs of my P7 as the steel ones are getting chewed up with me tightening them all the time. Obviously I can take them out and measure them, but I'm not sure how this compares to "M" numbers such as M4/M5 and obviously, the bolts listed on ebay/ superstar etc are described as "stem bolts/bottle cage bolts" etc.
Is it as simple as M4=4mm M5=5mm etc?
Thanks

