I agree, you would then need to source tyres, buy them, then drive them back, get wheels off , then do this job that not many people do, so if u get stuck it may be abit nervy. Then get the wheels balanced. Way easier and more cost affective (if u see time as.money) to have someone like tyres on the drive or kwikfit on the drive (I can personally recommend). They come tomyou doo and do the work there. Or you can save even fuher if u take it to a tyre shop and have them put on part worn tyres. In average with average annual mileage and correct weekly checks if tyres pressures a new set of tyres should last about 4 years. Not really worth it in my opinionmy advice would be save your money, you'll need to have the wheels balanced or your car will shake like it has haxagonal wheels.
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