Inner tube 3.50-8 for wheelbarrow tyre 8" Potreba

Product Information

Please Note: any reference to 'Royal Mail 24 ™' and 'Royal Mail 48 ™' are Official Royal Mail Service names and should not be interpreted as '24 Hour Delivery' and '48 Hour Delivery'. On bikes, Schrader valves tend to be used on lower pressure tyres, such as kids's bikes and mountain bikes. These are the same valves used on all motor vehicle tyres and are often referred to as ‘car type’ valves. Schrader valves have a core that is sprung loaded, and the central pin can be depressed with a narrow object to release air from the tube. The spring mechanism keeps the valve closed. Bigger tyres naturally require bigger inner tubes. On the left is a 700×32-47C inner tube, while the right is a 700×18-28C. Simon Bromley/Immediate Media

Inner tubes are normally made of butyl rubber or Latex, they sit inside your tyre and are inflated with a pump, they sometimes puncture but are easily replaced. Inner tubes are simple but essential – unless you’re riding with tubeless tyres, you’ll always need an inner tube. Carrying spares is always a good idea, even if you are running tubeless, as a large slash or hole will not seal easily. The load index and speed index is gradually replacing the PR marking for tyres. The load index is given by a number between zero and 159 in our chart, but can be much higher. The speed index is given by a letter (or letter and number in the case of 'A' speed rating) between A and Z. Typical examples for our type of tyres would be 68M, 55N or 38F. Any ATV tyres we list with this marking will also be 'E' marked and fully road legal. Contrary to the PR marking, the LI and SI give unambiguous and comparable information on the load capacity which can be drawn from the tables below; Speed symbol The rim diameter is not mentioned in this size marking, but it can be easily worked out, because the tyre sidewall height will be the same as the tyre width. So, an 18x4 tyre is 18" tall, 4" wide, and fits a 10" diameter rim (18" overall height minus two lots of 4" high sidewalls). The modern equivalent size for an 18x4 would therefore be 4.00-10. This time there are three parts to the tyre size, all in inches. The first, 4.10, is the approximate width of the tyre when fitted to the recommended wheel. The second, 3.50, is the height of the sidewall, and the third is the rim diameter.

Product Questions

So a 4.10/3.50-4 tyre is 4.1" wide, 3.5" tall on the sidewall and fits a 4" rim . This tyre would therefore have the appearance of a low profile tyre. ie it is lower than it is wide.

As already mentioned, it is important not to mix tyre sizes or types on motorised machinery as there can be significant variation in heights and widths between different manufacturers. We have even found that sometimes tyres of exactly the same size marking can vary significantly. As with car tyres, we would suggest you replace your tyres in pairs to ensure optimum performance. If you are looking to change your tyre size, the height and width may be selected according to your needs, bu the last figure, the rim diameter, must be the same, unless you are buying new wheels too! This is the traditional method for marking car and van tyres, so is also used quite often for trailer and caravan tyres. The first part is the width of the tyre in mm, the second part, if present, is the height of the sidewall expressed as a percentage of the width, and the third part is the rim diameter in inches. If there is no percentage indication in the tyre size, the tyre sidewall height is taken to be 80% of the width. You may sometimes see a tyre with the 80% in the size eg. 155/80-13. The 'R'. when present within the size, means the tyre is of radial construction.Valve extenders screw onto the top of the Presta valve. Some are just hollow tubes, others include a valve at the top, which means that you need to remove the valve core from your inner tube before screwing on the extender. If you have carbon rims on a bike with rim brakes, you also need to be careful not to drag your brakes on long descents because overheating can cause latex tubes to fail. Some wheel makers recommend against using latex tubes with their rims. As well as coming in pretty colours, latex inner tubes offer lower weight and rolling resistance than butyl inner tubes. They’re relatively expensive though and heat build-up can cause issues if you’re using rim brakes on long descents. Simon Bromley/Immediate Media For even more weight saving, latex tubes are significantly lighter than butyl tubes, plus there’s less friction against the tyre, resulting in lower rolling resistance.