Vintage Schwinns, Classy Cannondales, & an '83 Santana Tandem
ZB, I might be able to help you out. Thanks to ftwelder and nlerner I have a huge supply of cogs. I'm almost certain I can build you a 6 speed Suntour Perfect or Procomp in a similar range, something like 14-15-16-17 or 18-24-34. But I do have a couple of 7 speed Shimano bodies and hopefully the needed cogs. I have a very busy day, but should be able to dig through the gears on Friday.
Upright and Recumbent....too many to list, mostly Vintage.
Bob thank you, I may take you up on that offer, I'll PM ya about it a little later today.
This is going on a 52-43-34 crankset.
robatsu, I sort of have a specific reason but its more an idea that I'd like to bring to fruition, and I'm definitely open to suggestions outside of what I've come up with. My aim with the corncob+bailout cog is basically to use 6 out of 7 cogs for normal riding, and get the benefit of nice close ratios from the corncob and save the big cog for big hills when I'm already in the small chainring.
even with a 5 speed (on the aforementioned triple) 14-15-16-17-??? I'd get around 6% steps between gears all the way from 50 on up to 100 gear inches and the ??? is however big of a Jump i can convince my RD to do.
The other thing I considered is the 14-16-18-20-22-26-34 Megarange freewheel and change the middle chainring to a 49T. the resulting 52-49-34 chainset would produce about the same results as the corncob+bailout idea. Problem is finding a 49T 86mm BCD chainring