Last April I replaced the small chainring shown in this photo. The new chainring has 38 teeth. I neglected to note down how many the old one had, though I recall it is greater than 38. The old one was so worn that I threw it away.

From this picture, taken before the replacement, how many teeth do you think there are?



I figure 39 (7.8 teeth between the bolts, times 5 = 39). This is a 1995 Specialized M2 Pro.