It is called a half step plus granny. Back when you only had 5 or 6 cogs on the rear, you wanted all of them to count, so you set up the two big front chainrings to be able to split the difference between any of the rear cogs. For example, if the rears were 12% apart, the fronts were 6% apart. That way you had 10 distinct gear ratios with a 5 speed freewheel. The small inner front was the granny for the steep hills and generally only used with the two biggest rears. I used to have a chart with the ratios taped to my stem so I knew which way to go on the all too common double shifts.
On Monday, June 12, 2017 at 3:26:38 PM UTC-4, Beaverton Bob wrote: > > *Should have said, look closely AT THE SECOND PICTURE. Hint: It's a > TRIPLE!* > > On Monday, June 12, 2017 at 12:24:46 PM UTC-7, Beaverton Bob wrote: >> >> https://portland.craigslist.org/mlt/bop/6172833571.html >> >> Hope the link works! Look closely to appreciate what I think is a VERY >> close-range crankset. >> >> Regards, >> Beaverton Bob >> > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
