When moved to Chicago from Helsinki few years ago, I noticed that tyre shops offered 50000 miles guarantee on distinct makes of automobile tyres, technically it is not usual to see guarantee on consumable item, again the life of the tyre depends on a number of elements like car weight, suspension geometry, kind of road on which vehicle is driven, how a lot of miles per day, weather & temperature also affects the tyre and considerably much more technical factors.
Also discovered numerous manufacturers offer unconditional guarantees, right after carefully reading the documentation you would uncover what unconditional guarantee means, there are particular criteria you really should full fill just before unconditional guarantee applies, below I have mentioned some points.