How is friction small in the bottom bracket of a bike?
The bottom bracket where 3 frame arms meet is supplied with ball or roller bearings which are able to reduce friction very substantially. There are ball or roller bearings also in the gear changing mechanism, in the top and bottom of the "headstock", the front tube into which the handlebar fits, in the pedals, and in the hubs of both wheels.
On the most common bicycles the bottom bracket is the bearing assembly that the crank arms and the pedals turn in.
Yes, if you can find the correct bottom bracket for the frame.
BB usually stands for Bottom Bracket, the part which holds the cranks/pedals to the bike
In the bearings
with W D 40 or just regular bike oil.. i usually oil my bottom bracket and headset bearings and the chain
Depends on what type of bottom bracket you have, but usually you need something called a crank puller to do it.
The acceleration of the bike will depend on the general shape of the hill(ie. it's slope along the line of movement). If you don't take any friction into account, yes, the speed of the bike at the bottom will be greater if it goes from the bigger(ie. higher) hill.
IF your bike is squeaking when you pedal it is most likely because your bottom bracet is old and dry. i recommend getting a new bottom bracket, or at least the bearings.
What size threadless bottom bracket should you buy for an old 500 Reynolds tubed dawes road bike frame?
The friction is useful on a bike when you push it.
A Haro F1 uses a "standard USA" bottom bracket with press-in cups (as opposed to a "Euro" bottom bracket, like what road and MTB bikes use). These bottom brackets don't come in sizes because there's only one size. Bottom bracket spindles do, however, vary based on the crankset you're using. If you're talking about the Haro Fusion cranks that come with that bike, you're talking about a 19MM, 8 spline spindle, which is actually pretty… Read More
It's a bike frame that measures 18" from center of bottom bracket to top of seat tube. 18" would be just a tad shy of mid-sized.
The brakes use friction to stop the bike and the tyres use friction to grip the road.
Probably from the friction of the air squeezing through the small space?
Depends on how they're mounted. Usually it's one bracket on the seat tube, one under the bottom bracket and one on the right seatstay. The seatstay is usually a wraparound clamp. Loosen the screw, pry it open, and off it comes. The one at the bottom of the bottom bracket shell is usually screwed in both the shell and the chain guard. The one at the seat tube might be welded to the frame, but… Read More
Too long to answer here, there's half a dozen or so of styles. check out www.bicycletutor.com, www.parktool.com or www.sheldonbrown.com for pointers.
That is because of Friction. It is called heat friction and when you slow down after the brakes rub so hard against each other, it generates a lot of heat. also, you can check Wikipedia for more about heat friction.
The two most important measurements are center-to-center for seat tube and head tube(top tube length), followed by the seat tube height, measured from the center of the bottom bracket. the frame size is the distance between the seat post clamp and the bottom bracket. for smaller bikes measure the size of the wheel
yes... if you have the right bottom bracket... it has to fit the cranks as in 19 20 21 or 22mm most likely......... and it has to be the right size for the frame.. if its bmx it will probably be US size or euro, spanish or standard. if you find the right bottom bracket with the right size bearings then yes..
Yes. W/o bearings the crank would spin directly in the bottom bracket shell. This'd steal energy and eventually wear the frame out.
Friction. Air friction, road friction and mechanical friction.
If you buy it new it will most likely come with a mounting bracket. The bracket will usually go on to the handlebar, but might also be intended to wrap around one of the front fork legs. Older lights used to rely on a bracket already mounted at the bottom of the handlebar stem. If you've gotten one of those and haven't got that bracket, go visit an bike mechanic and he can get you… Read More
Friction is what ultimately stops your bike
Friction can be both harmful and helpful. Without friction the tires of the bike could not push against the ground to move forward, and the brakes would not stop the bike. However, friction can cause parts of the bike and the tires to wear down. Also, to overcome the friction between the tires and the road you need to pedal harder to go faster. friction is helpful to stop the bike when you put on… Read More
It's a BMX racing bike for beginners. What we would call a "Junior" size (pre-teen). It's a strange mix of entry level and high end. For example, it has a hi-ten steel frame, plastic pedals and unsealed hubs, yet it has a sealed bottom bracket and a Cro-Mo three piece crank. It's a small bike as it has only a 19 3/4" top tube and an "upside down" style handlebar stem.
No, if you are going down hill on your bike then friction makes your bike go, but some time it is going to stop.
Friction Is Useful For Lots Of Things Like Walking Or Riding a Bike
It'd be a fairly strange BMX if it has a gear shaft. Most "real" BMXes are single speed, their driveline consists of cranks, a bottom bracket and the rear hub. No gear shaft there.
A bicycle has high friction at the brakes, first and foremost. Then at places where the rider holds on to the bike, Grips and pedals. Between tires and road.
W/o friction just about nothing would work. Friction is what keeps the tires from rotating around the rims, and the tires from spinning on the ground. W/o friction a bike wouldn't be steerable, as the bike would continue straight forward even whe the wheel is pointinf towards one side.
riding your bike
In the bearings.
When you put the brakes on your bike is friction. If you rub your hands together really fast, then you are also creating friction.
friction can be bad when you dont oil your bike enough and it is noisy and difficult to pedal.
Riding in gravel will be heavier.
A bike rolling down a hill. The bike's tires rub against the hill, creating friction, causing the bike to slow down and not keep rolling and rolling
You could argue that friction is important in most aspects of the bicycle. For one, friction between the bike tires and the ground allow the bike to move forwards and backwards, and to stop. Without friction between the various gears and the bike chain, they wouldn't move very efficiently when you pedaled. Friction between your foot and the pedals is also necessary, or else your foot would continually slip off. You could even argue that… Read More
Because friction stops momentum of force from moving the bike
We Increase Friction when we are stopping a car, bike or when slowing down to a way up.
Serial numbers are usually found on the underside of the bottom bracket, but may also be on the seat tube or the head tube. Bikes with frame mounted rack brackets may have the serial number there.
You need a special tool called a crank puller. Then, depending on your bottom bracket you might need another special splined tool to get the BB spindle and bearings out.
Running into an immovable object will stop you pretty much instantaneously... Otherwise, on the flat - friction. Friction as air drag, friction as rolling resistance of the tires, and a tiny bit lost through the bearings. Aiming the bike up a hill will stop the bike fairly soon too if you're not pedalling.
A crank, or crankarm is part of the pedal assembly. they sit a bit like the arms on a clock with one ended anchored at the crank axle AKA bottom bracket and the pedal where you put your feet at the other end. Pushing on the pedals puts tension on the chain, which rotates the rear wheel and pushes the bike forward.
Friction slows you down. If you are using your brakes, friction can save your life. Friction isn't so nice when you are trying to peddle up a hill.
friction makes riding a bike possible. When the tire presses on the ground, friction acts against the rotation of the tire, fixing the lowest point of the wheel on the floor. This force is transmitted to the axel of the wheel and is what propels the bicycle forwards.
Depends on the design. For some, undo the pinch bolts on the top right and left of the crank then undo the big bolt....should slide off after that. For some you need to remove the big bolt going into the bottom bracket, then install the correct crank puller and pull the crank off. If it's an Ashtabula, one-piece crank, you remove the pedals, unscrew the bottom bracket, and thread the crank out through the frame.
I have a 2006 Honda VTX1300R The headlight assembly has two holes for adjusting screws in the bottom at about 4 oclock and 8 oclock. Insert a Phillips screwdriver until it "catches" the screw. Turning it clockwise will raise the light beam on that side. It is not easy. however; this does not always work. I am not a certified motorcycle mechanic. This is what I did after five months of trying everything else. Do… Read More
Well.. There is surface friction from the tires on the road, there is air friction from the bike itself ,, more air surface friction if your on it.. Then there is mechanical friction through the resistance of the, chain, bearing assembly grease in axle.
to reduce friction
Inertia, gravity, friction.