restchecks.blogg.se - Tyre aspect ratio calculator

Remember any tyre defects that you can be prosecuted for on your towing vehicle, also apply to your caravan or trailer tyres when towing it on public roads. This number will tell us the wheel size the tyre was intended to fit.

Wheel sizes are defined by diameter x width. The following number indicates wheel diameter. The letter is symbolic of construction meaning the letter ‘R’ stands for radial so that the layers run radially across the tyre. This number is actually a percentage of the section width, so in this case the. 80 is the Aspect Ratio or Profile which is the height of the sidewall. In other words, it’s the width of the tyre in mm when mounted to a rim of a specified width. If you have any doubts about the suitability or the condition of your trailer or caravan’s tyres please consult a caravan or trailer tyre specialist. Aspect ratio is the height of the tyres cross-section to its width. 295 equals the Section Width of the tyre (across the widest point of the tyre). If you have any questions or are unsure what your tyre pressures should be please contact us for guidance. The above information and calculator is meant for guidance only. Our tyre size comparison calculator takes the measurements of two tyres and compares the overall diameter, tread width, sidewall, and difference percentage. This is based on the fact that for every 10℉ temp change the tyre pressure changes by 1 psi (or for every 1℃ temp change the tyre pressure changes by approximately 0.19 psi). ** It’s worth bearing in mind that as a rule of thumb, the inflation pressure of a hot tyre is usually about 4 psi higher than when cold. * If you intend to continually use a trailer below its stated Maximum Gross Weight then you could enter the Actual Gross Weight instead but you must remember to increase the tyre pressures to the correct pressure when the trailer is loaded to its maximum. Bar can be converted to psi by using the converter below. It will say something like ‘Max Load 387kg At 42psi Cold’ it might have the pressure given in Bar. This is usually located on the side wall below the tyre data in smaller text. The other bit of information we need to find from the tyre is the Maximum Tyre Inflation Pressure.

The last letter is the speed rating for the tyre.

Your tyres should be rated for at least 90% of the MTPLM (Maximum Technically Permissible Laden Mass) of your caravan or trailer.

The last number is the load rating of the tyre, this is required for the calculation, it can range from 60 to 130 which equates to a maximum load per tyre of between 250 Kgs to 1900 Kgs.

I want to see how much difference there would be if I installed a different size, Example: 245/45 ZR17. Tyre size calculator for Current Tyre Sizes.

The following number is the rim diameter (in inches), in the above example the tyre has a is 13 inch diameter. I have 225/50 VR16 tires on my car right now: 265 is the Overall Tire Width in mm.

You can also run comparisons between different tyres and work out the. If you are thinking of changing the size of your car tyres, or are planning on buying a new wheel/tyre combination then it is.

The next letter is the Construction, in this case, “R” stands for Radial Use this page to work out the radius, circumference and diameter of any size tyre.

In this example, the tyre wall height is 80% of the width of the tread

This is the Aspect Ratio of the tyre wall over the width of the tread.

This is the tread Width in millimeters, in this case, 145mm wide.