Originally Posted by
cikal
I got the crown race off...but how on earth am I supposed to, when measuring with a ruler, differentiate between 26.4mm and 27mm? Impossible!
To figure out the stack height I measured the length of the steerer, which is 135mm, and the length of the head tube, which is 100mm - so a stack height of 35mm.
+1 Stop using a ruler. Invest in a nice micrometer. In the states, I bought mine for $10 at Harbor Freight. You will use it again and again as you work on your bike. A tape measure or ruler just won't cut it.
The easiest way to get sizing advice around here is just take the frame to your favorite local shop. Mine has a stash of perfectly good but used headsets. My last replacement cost me $2.