So I was cleaning my rear wheel and adjusting my cones before work today, and decided to flip over to the 14t cog, because, hey - it's windy, and I'm bored...
Anyways, I also moved my computer to where I could see it and was looking at the cadence/speed while I was riding in on the Greenway. Oddly, it didn't seem like I was going any faster on the track bike than I go when I'm on the beater commuter with the fatty tires. My cadence was down about 10 RPM since the gearing was higher, I think that had a lot to do with it. I checked out the specs on Sheldon's calculator when I got home, and this is what I found:
Fuji Touring Conversion:
700x32 w/ 171mm cranks, 42x16
Gain Ratio : 5.3
Speed @ 100 RPM : 21.1
Gear Inches : 70.9
700x23 w/ 175mm cranks, 44x14
Gain Ratio : 6.0
Speed @ 90 RMP : 22.1
Gear Inches : 82.6
I'm actually wondering if I should put a larger tire on the rear of the Fuji. I have a 15t cog that might be good to put on there, too. It seems like with the larger tire, you get more distance and speed, but it doesn't feel like a larger gear. Even though that bike is 5-6lbs heavier, it's easier to get it moving, and easier to maintain the speed.
It also has me wondering what the point of the 23c wheels and tight geometry actually are. I mean, sure, it's a pretty looking bike, but if there isn't really much of an actual gain in speed... What's the point? A harsher ride and more likelyhood of pinch flats?
I'll have to do some more tests to be sure, because the weather conditions were different each time, but I have the feeling that I'm going to find that my beater is faster than my nice bike...
And, yeah, I don't know what the point of this post was. Just bored and thinking about it a little too much, I guess.