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Errols Tyre Shop - Wheels and Tyres for sale on the internet
At Errol’s Tyres we are committed to giving you the ultimate online shopping experience.
We offer the most convenient way to buy your car's tyres, battery, alloy wheels and accessories. Read more about our outletErrols Tyres buy your tyres online

Buying tyres online is as easy as 1-2-3

We deliver to your door - throughout South Africa
1. Find the right product at the right price. Add it to your shopping cart.
2. When ready place your order and tell us where to deliver your order.
3. We'll contact you to confirm your order and with payment instructions.

Tyre Plus Sizing & O.D. Calculator.

Calculation comparing tyre overall rolling diameter for Radial Passenger, SUV, MPV, Light Truck

Please enter the width, aspect ratio and rim size for your current tyre and proposed new tyre.

 Current Tyre SizeProposed new tyre size
Enter a radial size:E.g. 205/45 R17 / R
Width(mm)
Aspect
Ratio%
Inch(Rim)
E.g. 215/45 R17 / R
Width(mm)
Aspect
Ratio%
Inch(Rim)
  ResetCalculate
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The above results are aimed specifically, in attaining an alternative tyre size which will measure and closely match the Overall Rolling Diameter & circumference of the existing OEM tyre to the proposed alternative tyre size. This will ensure that the vehicle's gearing is not compromised and the speedometer reflects as true a speed as possible. It does not imply that one cannot fit a larger and/or wider tyre size. By fitting a smaller/wider and/or larger sized tyre will affect the speedometer reading, and, if too wide, could cause the tyre/wheel assembly to touch the front wheel arch or suspension, especially on full steering lock

The above calculator is for Metric tyre measurements and below are a few popular comparisons or equivalents for Imperial measurements to Metric. Most tyre sizes in South Africa use the Metric measurement.
 
27/8.50 R14 Equivalent to 225/75 R14
29/9.50 R15 Equivalent to 235/75 R15
30/9.50 R15 Equivalent to 245/75 R15
31/10.50 R15 Equivalent to 265/75 R15
32/11.50 R15 Equivalent to 295/75 R15
33/12.50 R15 Equivalent to 315/70 R15
33/12.50 R16 Equivalent to 285/75 R16

Some important factors to consider when changing from O.E.M. fitted tyre & rim sizes to larger and/or lower profile tyre & rim sizes.

TYRE SPEED RATINGS AND LOAD INDEX HAVE NOT BEEN CONSIDERED IN THE ABOVE TYRE SIZE CALCULATIONS.

Why? It is important to ensure that the speed ratingand load index of the new tyre/s are the same or higher than the existing O.E.M tyre/s. This will ensure that the individual carrying capacityx 4 (load index) of each tyre (at the correct cold pressure inflation) is sufficient enough to handle the G.V.M of the vehicle (+ passenger load). The speed rating must be sufficient to legally handle the engine capacity & speed attainable by the vehicle. Failure to heed these facts may and can lead to premature tyre failure.

ENSURE, WHEN FITTING WIDER, LOWER PROFILE TYRES, TO EXISTING RIMS, THAT THE RIM AND TYRE WIDTH ARE COMPATIBLE.

Why? Should the tyre width exceed the width of the rim width, three major faults will occur. The first is the tread of the tyre will distort to the extent that the tread will not be able to make proper road contact across the tread area. The second visible fault are the side walls of the tyres will not "stand straight" and will lean in from the shoulder of the tyre relative to the bead flange, which seals the tyre to the rim. The third problem being the bead of the tyre will not seat or seal itself correctly onto the rim and this can cause "bead rock" or chaffing of the bead of the tyre, against the rim flange. Sudden air pressure loss may also be experienced. (Should the tyre width be narrower than the rim width, the reverse of the above will occur). Premature tyre failure will occur.

WHEN FITTING DIFFERENT TYRE SIZES TO SPECIFICATION, CONSULT YOUR VEHICLE SPECS WITH RESPECT TO ON-BOARD COMPUTER (E.M.S)

Why? Many newer vehicles have engine management systems installed. These E.M.S will often have been programmed to monitor tyre overall diameters and will pick up the differential if the new tyre/s exceed specifications. Often, the handling of the vehicle can be disrupted or compromised, and the E.M.S could shut down the engine, perceiving that a problem exists. Prior to fitting the larger tyres, please consult with your local vehicle agent in this regard, should you have an E.M.S on board.

CHECK CLEARANCE OF TYRE TO BODYWORK (WHEEL ARCH) AS WELL AS SUSPENSION CLEARANCE RELATIVE TO WIDTH OF TYRE.

Why? On fitting new over-sized tyres & possibly new rims, it is highly advisable to ensure that there is sufficient clearance between the front inner suspension and new tyre/rim assembly, as well as the outer bodywork/wheel arch. Before dropping vehicle onto the road surface and whilst the vehicle is still on the wheel lift, spin the front wheels to ensure that the inner side of the new rim does not catch on the brake calipers. Remove the vehicle from the lift and turn the steering wheel full lock, left and right, ensuring full turning clearance. Load a heavy weight (a few persons) into the rear of the vehicle to ensure that the new wheel/rim assembly does not catch on the rear wheel arch. Failure to conduct these tests could result in badly damaged bodywork and severely damaged tyres and or rims.

Where you can find us?

Tel: +27 (0)82 071 5434 /
       +27 (0)43 722 2809

13a Cambridge Street
City Centre
East London 5201
Eastern Cape

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