A tire iron (also tire lever or tire spoon) is a specialized metal or plastic

tool A tool is an Physical object, object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many Tool use by animals, animals use simple tools, only human bei ...

used in working with

tire A tire (North American English) or tyre (Commonwealth English) is a ring-shaped component that surrounds a Rim (wheel), wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide Traction (engineeri ...

s. Tire irons have not been in common use for

automobile A car, or an automobile, is a motor vehicle with wheels. Most definitions of cars state that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, peopl ...

tires since the shift to the use of

tubeless tire A tubeless tire ( also spelled as tubeless tyre in Commonwealth English) is a pneumatic tire that does not require a separate inner tube. Unlike pneumatic tires which use a separate inner tube, tubeless tires have continuous ribs molded integra ...

s in the late 1950s.

Bicycle A bicycle, also called a pedal cycle, bike, push-bike or cycle, is a human-powered transport, human-powered or motorized bicycle, motor-assisted, bicycle pedal, pedal-driven, single-track vehicle, with two bicycle wheel, wheels attached to a ...

tire irons are still in use for those tires which have a separate inner tube, and can have a hooked C-shape cut into one end of the iron so that it may be hooked on a bicycle spoke to hold it in place.

Description and use

Tire irons, which usually come in pairs or threes, are used to pry the edge of a tire away from the

rim Rim may refer to: *Rim (basketball), the hoop through which the ball must pass **Breakaway rim, a sprung basketball rim * Rim (coin), the raised edge which surrounds the coin design * Rim (crater), extending above the local surface *Rim (firearms) ...

of the

wheel A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle Bearing (mechanical), bearing. The wheel is one of the key components of the wheel and axle which is one of the Simple machine, six simple machin ...

it has been mounted on. After one iron has pried a portion of the tire from its wheel, it is held in position while a second iron is applied further along the tire to pry more of the tire away from the wheel. This allows enough of the tire to be separated so that the first iron can be removed, and used again on the far side of the other iron. Alternating in this way, a person can work all the way around the tire to fully remove it from the wheel, in order to reach the tube that sits inside. In the first half of the 20th century, they became a colloquial term of strength, as in "I couldn't get rid of him with a pair of tire irons," and frequently appeared in cartoons in similar situations. The usage is now considered

passé Obsolescence is the process of becoming antiquated, out of date, old-fashioned, no longer in general use, or no longer useful, or the condition of being in such a state. When used in a biological sense, it means imperfect or rudimentary when comp ...

Bicycle tire irons

Tire irons for

bicycle A bicycle, also called a pedal cycle, bike, push-bike or cycle, is a human-powered transport, human-powered or motorized bicycle, motor-assisted, bicycle pedal, pedal-driven, single-track vehicle, with two bicycle wheel, wheels attached to a ...

s are usually referred to as "tire levers", as they are often made of plastic, not metal. Tire levers for bicycle tires have one end that is tapered and slightly curved. The other end is usually hooked so that it can be hooked around a spoke to keep the

tire bead A tire (North American English) or tyre (Commonwealth English) is a ring-shaped component that surrounds a wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide traction on the surface over w ...

free of the rim at one point, allowing a second lever to be manipulated forward, progressively loosening a larger segment of the tire bead from the rim. A common feature of tire levers is the lack of sharp edges. The slightest pinch of an inner tube by a lever can weaken or puncture the tube. It is good practice to examine a set of tire levers for any sharp edges and to file them smooth and round. Another problem, though less critical, is that a steel lever would scratch aluminum rims. Classically, tire levers were made of metal. However plastic ones are now manufactured which are even less sharp and less likely to puncture the tube. There are also some single-lever varieties, which can be inserted under the bead at one point then quickly pushed around the rim to pop the bead off. Tire levers are not necessary or desirable in all cases. In some cases, the tire can be reinserted on the rim, and sometimes removed from the rim, without the use of tire levers. This reduces the chance of puncture caused by pinching the tube between the rim and the tire bead. Sometimes they are used to fit the tire back on, but this can be done without the levers.

References

External links

* {{Tires, state=collapsed Bicycle tools Tires Mechanical hand tools

Description and use

Bicycle tire irons

See also

References

External links