1: Gear calculators - how many ways can you reimplement a * b / c ?
2: Gear tables - numeric entries in a table obscure the real data, and make comparisons near impossible

Soooo… I had a go at a Gear Chart:

Vertical axis is (relative) gear inches by the 27" rule (27 * chainring / cog), horizontal axis is the rear sprocket, plot lines are chainrings - blue are even (as labeled), red are odd.

You can approach it three basic ways:

a: choose a gear ratio and draw a horizontal line
b: choose a rear sprocket and draw a vertical line
c: choose a chainring and follow the curve

Please have a look and let me know if it is useful at all - if so I might try to make it look a little less clunker and change the colours to something nicer…

What I’d love, is something like that with an intersecting line showing what combinations you can run with the same length chain, so you can figure out the highest and lowest gear possible.

lats: agreed, but that’s the whole gamut of street-going cogs

des: i could ditch some of the stupidly low rings, say start with 32 and lengthen the chart vertically. I’m not happy with the line colours, improvement there would help heaps too.

john: already planned after your comment last night

nath: how about warping the vertical axis to represent knee force haha