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Going to wider tires will hurt your CW-value. 20mm more width is huge increase. So like Zonked said. You can also find taller tires that are even skinnier. If you put there 3.5 bar or 50 psi they wont be wobbly even at pretty hard cornering, I can promise that. Also new tires dont roll so easily than the worn tires so that is why I recommended to test the effect on used worn out tires. Now I might see little drop on my fuel consumption with new tires, but well see that in the next month.
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