"How to: Calculating Tyre Size for Upsizing"
"Tyres ludlow, Tyres Berrington"
[ "Howto: Calculating Tyre Size for UpsizingThereis a fair chance that you must have heard a lot about upsizing andhave made up your mind to get it done. Here is a brief of everythingthat you need to know. In the tyre upsizing process, the originaltyre is replaced by a larger tyre and a low profile one is fixed.However, not many changes are made to the diameter and circumferenceto prevent any drastic changes in the performance. Before upsizing,you need to understand the terms related to the tyre and calculatethe right size of the same. Let's see howBasicsof CalculationTofind the right size of the tyre, you first need to understand all thebasic terms. So, the size of the tyre is mentioned on the sidewall.It is represented using numbers and letters. The terms are:TyrewidthAspectratioTyreconstructionRimsizeLoadcapacity or indexSpeedratingFor example, consider a tyre size 210/50R15/90V. Lets see how tointerpret itThefirst three numbers, i.e. 210 stands for width in mm (millimetres).50 specifies the aspect profile. The aspect ratio is the height difference from tread to the rim and is mentioned in percentage.Here 50 implies that the tyre height is 50% of its widthTheletter R represents the Radial ply type tyre construction. The next two digits indicate the rim diameter in inches. In this case, the diameter is 15 inches. Please note that 15 inch is the rim diameter and not the tyre diameterNext,the digits 90 represent the load index of the tyre. You can check the maximum load on the tyre per lbs using a car tyre load index rating table. For an index of 90, the max load for the tyre is 600lbsTheletter V also stands for a code that shows the maximum speed at which a tyre can be used and is called speed rating. For tyresLudlow having the speed rating V, can operate ata speed of up to 240 miles/hMathematics:Calculating FormulaYoucan use various calculators accessible on the internet for thispurpose. You will need to input the data such as the original tyre andupsizing tyres width, aspect ratio, and rim size. The results willshow you the difference in the circumference in mm as well as %Otherthan this, you can also try manual estimations. For this, you onlyneed therimdiameter. In the above example, the rim diameter is 15 inches. So,you need to find the total diameter of the tyre. The formula is asfollows:Widthin cm+ (aspect ratio %  Width in cm) + (rim diameter in inch 2.54)Here,2.54= 1 inch;So,21+(50% of 21) +152.54=49.04Now,perform the same calculation for the tyresthat youare looking forward to purchasefor upsizing. The difference between both should not surpass 3%If the difference increases by 3%, then you may experienceunfavourable changes such as reduced fuel efficiency and difficultyin handling the carAftercalculating the right tyre size, always remember that you will alsohave a speedometer & odometer error. This means once the upsizingis done, you need to re-calibrate the scales. The speedometer willusually over-read after upgradation and the value depends on the newtyresBerrington.Moreover, it is always recommended to get the tyre sizes examined byexperts. Your calculation may or may not be very precise, so gettingprofessional help will be beneficial" ]