Obtuse Tyre Sizes
A bit complex eh? Well, thankfully you won't need to measure these! It's printed directly on the side of the tyre so when you call in, just state the numbers and awaaaay we go!
Back to the odd tyres sizes. Now, you've probably seen on most rear wheel drive and performance vehicles that the front tyres are small than the rear. For example, the Jaguar F-Type SVR has 265/35 R20 on the front and 305/30 R20 on the rear. But, why is this? When you have a rear wheel drive vehicle, all the power will be sent to the rear (unless it's a newfangled BMW that can send 100% of its power to the front or rear). Now, unless you have an elephant sitting in the boot, there will be no weight to help squish these tyres to the floor and provide grip. Having wider tyres helps to increase the grip and provides better traction to the road.
But why don't performance FWD vehicles such as the new Type-R, Megan RS or Golf GTi have larger tyres on the front? Oversteer. Oversteer! Having too much grip on the front and not enough on the rear can result in an unexpected drift around a corner or a complete spin out. Not helpful when going around a roundabout.
Other noticeable examples of weird/unique tyre sizes include the Lamborghini Countach with 205/50 R15 on the front and an insane 345/35 R15 on the rear. Just imagine how wide that is!
Or, going the other way and increasing the rim size to keep the rolling radius correct, we have the Plymoth Prowler with 225/45 R17 on the front and 295/40 R20 on the rear.
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