Bicycle question.. What are fixed gears/10 speeds?

bicycle helmets are useless image

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I am about to buy a used bike and there are a few things I need to know:

-What is the difference between a fixed gear/non-fixed gear, and the different speeds(1 speed/10 speed/other speeds)?

-What are the extra gears for? Why are some bikes fixed/non-fixed geared?

-What are the different types used for and what do YOU prefer? Why?
If you can't coast with a fixed gear, what makes them so fun?

Answer
if you don't know what a fixed gear is, you probably shouldn't get one. a fixed gear is just what it says, it has 1 gear which is fixed, ie. it only goes in 1 direction and there's no coasting. if the wheels are moving, so are the pedals. mine doesn't have brakes but that's a whole other issue.
"10 speeds" generally refers to older road bikes which have thin tires and are good for the city, but useless off-road. fixed gear is a lot of fun, but challenging. road bike is good too. mountain bikes are fun but you can get really hurt. in any case, wear a helmet and be safe.

Zorak asks, "Do you think bicycle helmets are the dorkiest and most useless item..ever?"?

enbsayshel

"What is your opinion? Do they even do any good? MAYBE for "professional" bike racers, etc., but for adults in general, I just want to knock them off peoples' heads. I can understand maybe for kids (but even then I find them ridiculous), but, man the helmets, the outfits, etc. "Back in the day" we rode our bikes, and if we fell, we scraped our hands, elbows, knees, etc., and rarely did we hit our heads. We had enough sense to throw our limbs out if we fell in order to absorb the impact. I know I sound like an old fuddy-duddy, but really, do people even need them?"

Answer
The helmets are ugly, but they are there for protection. It should be your own choice weather or not to wear one, and I think they really need to come up with a better, more serious look to them. Motorcycle helmets don't look dorky to me, and I think they should build them a bit more like that. I've never worn a protective helmet, not only because they're dorky but because I just figure I don't need one. I've had bike accidents involving smashing my head into the pavement but it doesn't SEEM to have left any lasting damage. =P

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Title Post: Bicycle question.. What are fixed gears/10 speeds?
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