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Bicycle Tyres - Ursus

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Bicycle Tyres - Ursus

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Ursus Jumbi Evo XL Zweibeinständer (bis 29" | 33cm | schwarz)
was €51.16 Special Price €32.79
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Ursus Curve Rear Hinterbauständer (26" - 28" | schwarz)
was €18.59 Special Price €15.46

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Buy Bike Tyres | Bike Mantle cheap on velondo.ie

No bicycle part has a greater influence on the riding comfort, speed and smooth running of a bicycle than the bicycle tyre. If the tyre is under-inflated, you feel like you are stuck to the ground and can hardly make any progress. If the tyre tread is not right for off-road riding, you will slip or the bicycle tyres will spin. If the bicycle tyre is too wide, even the most streamlined frame of the road bike is of no use, the opponent is probably faster.

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The construction of a bicycle tyre

A bicycle tyre is usually made up of a rim, a bicycle casing and a bicycle tube with a valve. The bicycle casing is robust and protects the inner bicycle tube. The inner tube of the bicycle tyre has a valve and is more or less airtight. There are four different types of tyres. Clincher tyres are the most common. They are extremely robust due to the braiding of thin metal wires on both sides of the tyre. Clincher tyres are available with or without puncture protection. Folding tyres are similar in principle. Folding tyres are reinforced with Kevlar threads instead of metal wires. Folding tyres are lighter than clincher tyres and, as the name suggests, are easy to store. Tubular tyres have the inner tube sewn into the tyre casing. Tubular tyres have to be glued onto special rims. They are relatively light and have low rolling resistance. However, they are almost only used in cyclo-cross or professional sports because repairs are expensive and time-consuming and because tubular tyres usually have to be replaced immediately in the event of a puncture. Solid rubber tyres are robust and have a high puncture resistance. However, this puncture resistance comes at the expense of weight and rolling resistance, which is why they are less frequently found on the roads. Another type of tyre is the tubeless tyre. However, this type of tyre is only used on mountain bikes. Balloon tyres are actually only extremely wide tyres that can cushion uneven ground very well, but have a relatively high rolling resistance.

Inch specification for tyre size

The tyre size is also usually given in inches in Germany, although we actually have a metric system. In the 28 x 1.75" designation, the first number indicates the outer diameter of the tyre and the second number the tyre width in inches. In the ETRTO standard (European Organisation for Rim and Tyre Technology), the tyre size is given in millimetres. The size 32-622 thus refers to a tyre that is 32 mm wide and has an inner diameter of 622 millimetres. There is also a French tyre designation (e.g. 700-32C). The first number is the outer diameter in mm and the second number is the width of the tyre in mm. These different size indications naturally confuse the end user, especially as the values are also inaccurate.

Children's bikes usually have an outer tyre diameter of 12 - 24 inches. Youth bikes and most mountain bikes have an outer tyre diameter of 26 inches. However, there are now 2 other tyre sizes for mountain bikes: the so-called 29er, i.e. 29-inch tyres and an intermediate size, the 27.5-inch tyres (also called 650 B). The standard tyre size for city bikes, trekking bikes, racing bikes, cross bikes and single-speed bikes is 28 inches. BMX bikes have 20 inch tyres.

If the tyre does not fit the rim, the rider has a problem

The outer diameter of the tyre does not, of course, say anything about the width of the rim. So you have to be very careful that the tyre fits the rim width. Road bike tyres are usually extremely narrow, because narrow tyres have less rolling and wind resistance. Narrow road bike tyres are ridden on the road at about 7 - 9 bar. Professionals and track cyclists ride with even higher tyre pressures. For mountain bikes, the focus is less on speed and more on traction. Therefore, mountain bike tyres are wider and more chunky than road bike tyres. Mountain bike tyres should provide the necessary grip in rough terrain, not spin even on muddy or slippery surfaces, and not break at the slightest knock. Off the beaten track, chunky bicycle tyres offer better power transmission. The bicycle tyres of touring, trekking and city bikes are usually wider than road bike tyres and narrower than mountain bike tyres.

"Unbreakable" tyres

Plancture resistance also plays a major role in touring and trekking bike tyres. Some renowned tyre manufacturers even offer "indestructible" tyres. These tyres are fitted with an approx. 5 millimetre thick insert made of highly elastic special rubber. This insert stretches around the tread of the tyres like a protective belt and even helps against tacks, broken glass and other sharp objects. However, the side surfaces of these tyres are not specially protected and are thus the Achilles' heel of the otherwise actually "indestructible" tyres. The puncture protection, however, has a negative impact on the scales. Weight fetishists will therefore tend to refrain from buying such tyres, especially as they also have a higher rolling resistance and are harder than tyres that are not equipped with special puncture protection.

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If the bike is just standing around, the tyre will run out of air

The mileage and durability of a tyre depend on many factors. What a layperson may not be aware of is the fact that frequent riding puts less stress on a tyre than standing around all the time. Idleness is therefore the beginning of all vices when it comes to bicycle tyres. Furthermore, the service life of a tyre depends on the tyre material, the riding style, the braking behaviour, the ambient temperature and the tyre pressure with which one usually rides.

Nobody is immune to punctures, even the toughest tyres with even the thickest puncture protection will become worn and brittle and need to be changed once. Experienced cyclists are prepared for emergencies and always carry a spare inner tube, repair kit, tools, plastic tyre levers, an air pump (suitable for the valve and a spare valve (Blitz or Dunlop valve, Sclaverand valve or Auto or Schrader valve))

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If the tyre pressure is not correct, mileage will be noticeably affected

Even without a puncture, the tyre pressure should be checked regularly. A tyre that is 0.5 bar underinflated has a higher rolling resistance and already noticeably impairs mileage. The correct air pressure for your tyres is indicated on the sidewall of your tyre in bar or psi (pounds per square inch). 1 bar is equal to 14.504 psi. When buying an inner tube, you must also make sure that the valve fits through the hole in the rim. For Dunlop or Auto valves, the hole must be 8.5 mm, for Sclaverand valves, a hole of 6.5 mm is sufficient.

Reflectors on the front and rear of the bike are compulsory in German road traffic

According to the Road Traffic Act, all bicycles participating in road traffic must be equipped with reflectors at the front and rear of the wheel. Spoke reflectors also make the bike visible from the side. Reflective strips on the tyre sidewalls have the same effect. They offer additional safety in the dark because they reflect light even when illuminated at an angle from the front or rear. Unlike spoke reflectors, reflective strips are firmly attached to the tyre and therefore cannot come off unintentionally.

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