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Bike saddle covers can be purchased on the internet from eBay,Amazon, and Walmart. The saddle covers will be available in many different colors and styles.
Because different frames will give the bike different properties, which will influence the characteristics of the bike. A low top tube makes it possible to tilt the bike side to side, which is good for technical riding, but means that you need a long seat post, which is bad for stiffness when riding in the saddle. Short rear stays makes the bike nimble and good for uphill climbs, but makes it jittery on ascents.
It's the triangular bit on top that you sit on.
A bicycle seat is typically called a saddle.
Depends on how much too big they are. Not being able to put both feet on the ground with your butt in the saddle is perfectly normal, and is to be expected from a normal looking bike with some utility value. It needs to be that way for you to get a decent amount of leg stretch in during the pedal stroke. The way to get on and off a bike is to stand on the pedals and leaning forward a little while getting in and out of the saddle. Then you should preferably have space enough between the top tube and your crotch to be able to put at least one foot flat on the ground. If it's still too big (crotch hitting fram with feet on the ground) it isn't really advisable to ride, but you can still get on and off by leaning the bike over as you get up on the pedals. Then get into the saddle after you've gotten the bike moving. If you have to tilt your hip left/right to keep your feet on the pedals then your saddle is too high.
Depends on what it is that's too loose. If the saddle is properly attached to the seat post, and it's the seat post that's not sufficiently attached to the bike frame - then the saddle will simply end up lower against the frame as time goes by. Or it can start going sideways. If it's the saddle that isn't clamped sufficiently to the seat post, then it can be bad. It can tilt either nose up or nose down, which can be either uncomfortable or outright dangerous if you're coming off a jump. Worst case is the saddle coming off the post entirely, which would put the rider at great risk of injury.
Because different frames will give the bike different properties, which will influence the characteristics of the bike. A low top tube makes it possible to tilt the bike side to side, which is good for technical riding, but means that you need a long seat post, which is bad for stiffness when riding in the saddle. Short rear stays makes the bike nimble and good for uphill climbs, but makes it jittery on ascents. Road bikes don't have to take as much abuse, so they can be made more slender.
Generally speaking bike saddles aren't specific for one particular bike, so you don't have to look for a saddle from western flyer - unless you're looking to do an all-out restoration. What you need to keep track of though is that there are a few different seat post diameters and a couple of different ways of clamping the saddle to the seat post. But as long as you manage to match that you can buy whatever saddle you want.
Many of them had pegs on the back bone of the frame. The rider ran with the bike a few steps, and then climbed the pegs into the saddle before the bike lost speed and toppled over. If the bike didn't have pegs the rider would often use something in his surroundings to steady himself as he stepped up into the saddle.
mailny just like you'd use an upright bike. Adjust saddle-to-pedal distance for good leg extension. Check that the bike is in good working order. Mind the traffic and ride.
Pick a gear that's too heavy to pedal while sitting, get out of the saddle, and push it as hard as you can.