Road bike gears silly question

[MisterStan]

My Tiagra levers do, although I never look at them.

Mine too, I like to make motorbike noises and pretend they're rev counters....

 

[Beebo]

lager cog is best for climbing

Where can I find one of these lager cogs? I think I could have done with one of those on that last hill in the Kentish Killer!!!