Irrespective of the uneven wear, for which I can offer no better suggestion as to cause than those above, allow me to observe that those 'cracks' in those tyres seem an 'open invite' to shards of whatever to lodge and work their way tubewards. I have just replaced a 4 Seasons with 8000+ miles on it (622-28) which has got the odd nick but that's all (admittedly 3 times the price). Only swapped it out because I have some long rides coming up (starting with 450+km on Friday) which I wish to finish, preferably without unplanned 'stops', and have fitted a 'faster' tyre (4000SII).They are Vittoria Rubino Pro 25mm and only done 1800 miles.
An explanation could be a bad production batch.This tire (the Vittoria) lasted about a month and a half maybe 500 miles. Rear tire eventually sliced open (1 inch or so) without my hitting anything significant. Examining the tire there were slices all over the tire (never saw this on the Tioga's running the same route). Front tire is also already squaring off. Tire grips nicely in both good weather and wet I like the high pressure and weight. But with a durability issue like this I won't buy them again. Suggest avoiding them.
Just shows.need an info - is there anything available that's not made in Taiwan, or Asia. had 100% miserable experience with a few tire brands made overseas and 100% success with the same tires made in Europe.
last case is almost catastrophic failure with Vittoria Rubino Pro made in Taiwan...luckily removed the front one after found serious cracks...
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