
Fitting
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How is a bicycle tire fitted?
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Why is it sometimes so difficult to fit a tire?
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What can be done, if it is difficult to fit the tire on the rim?
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What can be done, if the tire cannot be centered?
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What should be observed for the fitting on hookless rims?
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How is a tubular tire fitted?
- How to use the Tubular Glue Remover?
How is a bicycle tire fitted?
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Why is it sometimes so difficult to fit a tire?
Fitting difficulties often arise when the diameters of the rim and the tire do not match perfectly. Rims may have a tolerance in diameter of +/- 0.5 mm (D1). In addition, the height of the rim flank also may have a tolerance of +/- 0.5 mm (G). This adds up to a complete tolerance of +/- 1.5 mm in the outer diameter (D2), or of +/- 4.7 mm in the outer circumference. This corresponds to a maximum possible circumferential difference of 9.4 mm between the largest and the smallest rim. A tire must fit on both extremes. Because a safe fit must be ensured even on the smallest permissible rim diameter, the fitting and the proper centering of the tire on the largest permissible rim can prove quite difficult. The circumferential tolerance of Schwalbe tires is ± 1 mm. |
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What can be done, if it is difficult to fit the tire on the rim?
It is always helpful to start the fitting opposite the valve and to finish it at the valve, as the tire bead to be mounted should lie in the rim well as far as possible. Instead of pushing the tire with the thumb, it is often easier to roll the tire bead over the rim flange from the opposite side on. Using tire levers helps a lot. Make sure the tire bead is not damaged during the fitting. Lever the tire in small sections and use the tire levers more often. Do not use metal tire levers. Sometimes the fitting of the narrow versions of the Marathon Plus tire turns out to be particularly difficult. Due to the inherent stress of the tire, the tire slips repeatedly from the drop-center and it is extremely hard to pull the last piece of the tire over the rim flange. A helping hand holding the tire on the opposite side in the dropcenter is very helpful. A cable tie or an old pedal strap could also serve as a helping hand. The new Schwalbe tire lever is particularly helpful when fitting is difficult. You can hook it in on the rim and herewith fix the already mounted area of the tire bead. This will prevent the bead from slipping out while you lever the last section over the rim flange. |
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What can be done, if the tire cannot be centered?
It is always helpful to start the fitting opposite the valve and to finish it at the valve, as the tire bead to be mounted should When the rim diameter is at maximum tolerance and the tire diameter is at minimum, it is difficult to get the tire beads onto the rim bead seat. Solution: Slightly over-inflate the tire for a short time, or put soapy water onto the tire beads to make them slip into place more easily. Our assembly fluid, Easy Fit, can be easily applied to the tire by use of the sponge applicator and without using extra tools or dirtying fingers. When inflating, the tire bead then glides easily into the right position on the rim. After approx. 10 minutes the liquid evaporates completely.
When the rim diameter is at minimum and the tire diameter at maximum, the tire cannot be seated properly regardless of the tire pressure. This situation can generally be addressed by centering the tire by hand at low inflation pressure. Make sure it is parallel to the rim. Only then should you pump the tires up fully. |
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What should be observed for the fitting on hookless rims?
A crotchet type rim has become standard these days. This is a rim with rim flanges pointing inwards with their crotchet shaped ends. In addition, there are many rims on the market which are referred to as Westwood rims. These are often used on Dutch bicycles for example. These traditional rims do not have crotchets which hold the tire tight and centered. Furthermore, Westwood rims are made of steel and have a very smooth surface. These rims require special attention for fitting. Manual centering. Before inflating the tire to its full pressure, make sure it is properly centered on the rim. The tire will not slip automatically into the correct position during inflating, as is the case with crotchet type rims. If the tire is not evenly positioned on the rim, it can come off the rim easily. Inflation pressure max. 4 bar. These rims are not suitable for high pressure. In most cases you cannot max out the maximum inflation pressure of the tire on these rims. According to the ETRTO standard the inflation pressure is limited to five bar. We recommend that you allow for a greater safety margin and do not exceed four bar. You should also consider that these rims are not really suitable for narrow tires or heavy riders. In addition, there are also state-of-the-art MTB carbon rims without crotchets on the market. According to our experiences so far, tire fitting on these rims does not cause any problems. The respective rim flange heights and material surfaces (friction) sufficiently prevent the tire from coming off. |
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How is a tubular tire fitted?
Attention: Tubular tires should be professionally fixed to rims using a proprietary contact cement (e.g. Schwalbe Tubular Glue)!
Preparation 1:
Preparation 2: New rim: Remove grease and if necessary roughen the rim well with fine sandpaper (1). Follow the rim manufacturer’s instructions! Evenly apply a layer of contact cement to the Rim (4) and let it dry for at least 6 hours (5)! Used rim: Examine the existing contact cement layer. An even and intact contact cement layer can be re-used. If the layer is very uneven, completely remove all remnants of the contact cement from the rim and apply new cement (4). Let it dry for at least 6 hours (5)!
Fitting: Important: Leave the assembly to rest under pressure for at least 24 hours! (12) Check tires regularly. Never ride on tires with a damaged or loose base tape. |
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How to use the Tubular Glue Remover?
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