Like pretty much every post on this thread, I didn't understand any of the jargon so I had to google an understanding first. Rings I now understand is what you call the front cogs while the back rings are actually called cogs
I also googled what rings and cogs my bike has - my front 'rings' are 46 and 30 while my rear cogs are 11-34t. I'm still not quite sure what that last 't' means....
I also understand how the gear ratios work (dividing the ring by the cog) but, going back to your bloke with the big 'ring' Graham, what about his cog sizes??







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