Search results
Results from the WOW.Com Content Network
Further, at least some motor-paced speed record bicycles have used Schrader valves. (The actual speed of Schrader opening depends on many factors; 150 kph is only a very rough guide. The important observation is a Presta valve's nut is not an advantage in actual use, because ordinary bicycles do not go fast enough for it to matter.)
Others may not cut off, but deliver a high rate of flow to fill the larger car tire, with a risk of over inflating and bursting a bicycle tire unless it is stopped with split-second timing. Inflating tubeless tires requires an initial surge of air to seat the bead, and specialized pumps are available specifically for this task. [3]
Inflating a bicycle tire equipped with a Presta or Dunlop valve at an automobile filling station requires an adaptor, while a Schrader-valved tube does not. Inflating at home or on the road requires either 6mm air chuck for Presta and Dunlop valves, or an 8mm chuck for Schrader valves. An important advantage of Schrader valves relative to ...
An inflator stem is not used; instead, a removable cap on a valve stem embedded in the tire rim is fitted, with only the cap visible. When inflating the tire, the cap is first removed, typically with a coin, and then a "portable" dedicated inflator stem is screwed onto the valve stem. Through the inflator, the tire is inflated as usual.
This leads to under-inflation of the tire. When a tire is under-inflated, it causes the inside of the tire to heat up. This heat compromises the internal structure of the tire which can lead to a blowout. When a tire is over-inflated, it wears the tread down faster, and becomes more prone to catching nails or screws in the tire.
These two properties are not linearly proportional to the area of the contact. For example, a 10% change in load or inflation pressure usually does not result in a 10% change in the contact patch area [ 3 ] because the load or pressure on a tire can be altered freely, and the contact patch area is affected by the tire geometry and stiffness.
Sidewall deflection is not a direct measurement of rolling friction. A high quality tire with a high quality (and supple) casing will allow for more flex per energy loss than a cheap tire with a stiff sidewall. [citation needed] Again, on a bicycle, a quality tire with a supple casing will still roll easier than a cheap tire with a stiff casing ...
A fat tire is a type of wide oversized bicycle tire, typically 3.8 in (97 mm) or larger and rims 2.6 in (66 mm) or wider, designed for low ground pressure to allow riding on soft unstable terrain, such as snow, sand, bogs, and mud. [70]