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What I have seen is, the moment i say, 'I want to upsize', dealer says 'No warranty applicable'. From his point of view, he says, any changes to the original specification, invalidates the warranty.
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Hmmmm, always a tricky situation. Yes, as long as its proven that the wider rubber had no effect on the part failure (potential?), there should not be a problem. Most service stations are pretty cool about it, and I havent had a problem with the warranty on any of my tyre-upsized cars. That said, it is definitely a grey area. If you must stick by the rules, dont upsize. Just go for better quality rubber in the same size.
+1 upsize is the safest, while balloon tyres almost guarantee no warranty work on your suspension
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