Why do you shift to a lower gear to pedal a multi speed bicycle uphill? do you save energy in doing so?
127905
It is an easy question. You are so right!
2946
You might try to ride in one gear!
549631
get smaller gearing and itll make it harder to pedal a little bit but youll get more speed so yeah or u could just get lighter parts so easier to pedal just make sure everythings tight or ulll get screwed over so yea if u need to know anything else bout bike email me crashnbad@yahoo.com
97983
Try creating alternative fuel. I'm reduced to cycling since the recent fuel price increase.
535774
Technically your bike has 21 gears--the number of rings on the front times the number of rings on your cassette in the back.  However, you don't really have 21 usable different gears.  This is because:\n\n1) Depending on how many teeth are on your chainrings (front rings, you have 3) and your cassette (7 rings on back), you may have some gears that repeat.  It is all about the ratio between the front ring and the back ring the chain is on.  For example, let's say your middle front ring has 38 teeth and one of the rings on your cassette in the back has 19 teeth, you have a ratio of 2 to 1 when your chain is on these two rings.  If your smallest ring in the front is 28 teeth and your smallest ring in the back is 14, you again have a ratio of 2 to 1, so these gears are actually the same.  \n\n2) There are also certain gears you should not use.  You should avoid cross-chaining--being in smallest ring in front (closest to the bike, on the inside) and the smallest ring in back (farthest away from the bike) or largest in front (farthest away from bike) and largest in back (closest to the bike).  Either of these gears, or close to them, puts a lot of stress on your chain because it torques it sideways.  This will cause additional wear on the chain and shorten the life of it.  Most bikes will allow you to do this because the chain is put at a length to allow for it, but it will also likely cause your chain to rub somewhere and also possibly make your bike not stay in gear very well.  \n\nHowever, these days, rather than multiplying the number of front and back rings to get speeds, bikes are now often referred to by the number of rings on the chain ring and cassette separately.  You ride a 3 by 7 (3x7).  A double road bike with a 10 speed cassette (typical of today's high end road bike) is a 2x10.  A more touring oriented road bike often has a triple chainring and is likely to be a 3x9 or 3x10.  A fairly typical mountain bike is a 3x9, but there are a lot of 2x9 or 3x8s out there too.
39876
changing the final drive ratio won't hurt the car, if that is what you are asking. What you didn't specify ws, what engine/trans. you have, and the gear ratio now.\nGoing to a 3:73 from say a 2:91, or even a 3:08, 3:42 whatever will do 2 things. This will make your engine rpm rise quicker, and will result in a higher rpm at cruise speed while on the freeway. Will also decrease gas milage.\nIf you are looking for the quick take off at a light, gears will do it, but won't make your car any faster. Only top out sooner.\n\nEDIT: it does not take less work for a motor to turn the diff. with lower gears (yes lower. Higher numbers are lower) In fact, the motor is doing the same work, only faster. A set of higher numbered gears cause the engine to rev up quicker, that is it. Still uses the same power. The reason people go with a new gear is to increase performance off the line, by making the engine reach it's power band quicker. An engine does not develop peak power at ide or low rpm's.
264109
I think it is just overall comfort.  We are seeing a lot early middle-age riders, tired of the discomfort of an upright bike, move to recumbents.  It is heavier, though there are a lot of titanium and carbon models available (for a premium, of course!)  It's a little harder to transport, though I've had two on my Thule Trailblazer hitch mount.  No, you can't stand up to get that extra burst of power, but you do have the resistance of the seat back to push against.  Anything that is comfortable will cause you to ride farther, longer, and with less fatigue. And that is a good thing.\nI wouldn't consider myself an expert, but I have ridden every type of bike in my life.  Started with a mountain bike because that's what I thought I wanted.  Then sort of turned it into a comfort bike and rode it for a while.  Then bought a road bike that I still enjoy riding.  Then finally fell in love with a Bachetta Giro recumbent.  Last Fall I did a 200 mile, 4 day ride on it.  I found it very easy to ride all day and get up a do the same the next.
540696
If the gears are shifting by themselves, and the chain is slipping, it is because the transmission that controls the chain below the main sprocket on the back wheel is letting them.\n\nOne thing I would check is the cable running from the shifter to the transmission. If the screw/bolt holding the cable has come loose, the spring on the transmission will pull the chain to the most relaxed position it can, i.e. a different gear or off the sprockets altogether.\n\nAnother thing to look for, is that the rear axle, when mounted to the frame, can be further back or closer to the pedals. If you truly ride it hard, it make have moved forward closer to the pedals, causeing the chain to loosen. I doubt this is the case, as the transmission is supposed to keep the chain in tension. It is still worth checking, though.
228351
You have a bevel gear on the end of the drive shaft (the input shaft to the differential). This gear right-angle drives a large "planetary" or ring gear that rotates about the axle but is not attached to it directly, but is attached via a yoke that carries two intermediate bevel gears, and these gears mesh with the gears that drive the two wheels. (You really need to look at the ref.) When the two wheels want to rotate at the same speed, the two bevel gears do not need to rotate and the transmission acts like a simple nondifferential mechanism. However any differential motion of the wheels is accommodated by rotation of the intermediate gears.\nP.S. For some reason I had to go to another page (at the ref. website) and then back to get the animations to work right.
103366
The legs (proper pedealing technique is important to getting a well-rounded workout) and heart benefit most from cycling.\n\nAny amount of exercise is better than none, I ride 60-100 miles each week.
98878
I think the answer lies not in mechanics, but in aerodynamics and maybe the theory of turbulence. My initial answer was that they will need additional energy to keep the bicycle stable, which might be true. Then I had an additional idea. I guess you are talking about cyclists moving in a group, not single cyclists. This group creates an air pocket (aerodynamic shade) which moves together with them, making cycling easier for those who cycle inside the group. Cross-wind blows this pocket away (or changes its shape dramatically), thus making it harder, especially if you have gusts of wind.  I would conjecture that if the road were wide enough and the cross-wind is steady, the group would still be able to benefit from the aerodynamic shade.
198940
Your all wrong, it's the gear shifter.\n\nThese cars allways do this, if your on a hill it's worse.\n\nHave a person-persons push on the car to "unstress" the pressure on the trans, then move the shifter into park.\n\nThis will work.
336061
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482652
Yeah bike change gear, but a bit different to cars.\n\nUnlike the clutch been on your left foot, on a bike it operated by your left hand. The gear lever is on your left foot rest.\n\nMost modern street bike use a 1 down 5 up system.\n\nThis means to go into first gear, you tread down on the gear lever, to change up you hook your boots under the lever a click the bike up a gear.\n\nAlmost every race bike these days uses the reverse patten method (just what i wrote above but backwards ! ) , and dont use the clutch to change up gears. They use a "quick shifter" that kills the bikes ignition system for a few mili seconds and engages the gear quicker the a human can. Might sound silly but a track were you make 40 gear changes, if the bike can change gear one / tenth of a second quicker then you, you will will gain valuble seconds on a track.\n\nHope this [ long !! ] answer helps you out.\n\nDude.
96724
i would reccoment low impact cardiovascular exercise such as bike riding\n\nresearch HYBRID style bicycles\n-hybrids have an upright seating position, this helps in taking off stress from leaning over like on mountain bikes. Hybrids also have a suspension seatpost which reduces impact on your back from bumps in the road. Bicycling involves smooth pedal motions which wont hurt your knee's as bad as walking. With the amount of gears available on bikes now-a-days, your sure to find one that is comfortable for your body. Try this, I work in a bike shop and get people with knee and back injurys all the time. This is highly reccomended
176
The main advantage is that the compact crankset gearing is much closer to the high cadence riding that is the current trend in modern cycling.  With a standard triple crank you have 30/42/52 chainrings, from which most people use the 42 and 30 rings.  The 30 is a little too short for most hilly rides, and basically you're spinning super fast to get up a hill.  The 42 is   a bit too small for barrelling down a hill, and the 52 is so steep that it's rarely being used.\n\nThe compact crankset has 50 and 34 tooth gears which are theoretically better for the way most cyclists ride today.  The 34 gives you short enough gearing to get up big hills but is not quite as short as the granny gear on the triple, and the 50 gives you the speed in a manageable dose.\n\nA couple things to consider, though.  In order to switch to a double compact, you need to replace a fair number of components, including the bottom bracket, cranks, rear derailleur (optional but highly recommended), front derailleur and possibly your left shifter.  You might be able to get what you want from switching out the cassette on your bike, which is of course a lot cheaper.
116433
It's a coached workout on exercise bikes.  It sounds silly, but it's pretty tough and can be really helpful in improving your fitness and biking efficiency.\n\nBasically, classes tend to be about an hour and a half with a warm up of focusing on technique (making sure that you are using the entire circular motion to drive the bike instead of just pushing down)  and then you will go through timed drills for strength or endurance.