My wife and I are both high-cadence riders by nature so we prefer small gaps between gears. Current front chainrings are 50, 39, 26. Unless we are going 20 mph or over we are in the 39.
I'm thinking I would like to lower the gearing to a 46 (or 44), 34, 26. I'm hopingthis would let us use the large chainring more often and provide more us with more useful gears in a range where we can use them. My question is this: I have read that Shimano (we have a Tiagra triple) is made for a 12 tooth gap between chainrings. I'd really like to order a 44, but I'm afraid it won't shift as well because of the 10 tooth difference. Going with a smaller gap between chainrings doesn't seem like a problem to me. (I can see how a larger gap could be a problem for upshifts).
The other problem is I'm not sure if the Tiagra would work well with a 46 in which case I may need a Mtb. derailleur of some sort? (Deore?)
Any advice would be much appreciated,