Originally Posted by
Squirrelli
Change them both to 47 x 18 for 68.6 gear inches.
For any rider, I consider ~68 gear inches the best all around ratio.
That gives you 18 skid patches, but stop skidding anyway.
And, instead of going up in gear ratio to go faster, learn to spin.
*Apologies to Mr. Cox if I sound like a dick.
No problem.
You can't help it.
As for the best all around street gear ratio for
ANY rider, I nomimate 63 gear inches.
I know that sounds absurdly low to most fellow forumites.
I got that gear ratio from a web site addressing off road fixed gear bikes.
http://www.63xc.com/
They made a very good argument for that gear ratio, and so I tried it.
At first it seemed way too low, but as I learned to spin, I eventually found my trip times around town coming up to my times at higher gear ratios.
Presently I have three fixed gear bikes: one at 82 gear inches (with front brake) for a specific commute; one at 63 gear inches (no brakes) for around town; and, one at 59 gear inches (front and rear brakes) for unplowed snow.
During my experiments with gear ratios, I found that I could successfully ride without using my brake or skidding at a maximum of 72 gear inches, but just barely.
At my age and weight, 72 gear inches does not represent a practical gear ratio for me, as I cannot reliably brake nor adequately accelerate.
However, I think a young, strong rider of normal to light body weight could easily ride at 72 gear inches without skidding or using his front brake.
I submit that in normal urban riding (normal, for me, meaning stopping for red lights and rolling stops at stop signs), a young athletic rider at 72 gear inches will match trip times with a similar rider at 82 gear inches.
82 gear inches offers raw speed and efficiency on long uninterrupted flats; and, 72 gear inches offers control, agility, braking and acceleration.
And 63 gear inches gets me accross an intersection in the blink of an eye.
Or so it seems to me.