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@cycleclinic
There is a reason why I buy them but I am out of stock till I get more. Not sure when that will be.
The thing I like the most about IRC formula pro tyres apart from the grip and puncture resistance is there longevity. 10000 km from a tyre is not usual. The roadlite is similarly durable but not as puncture resistant. however I have found they seal up rather well better than the schwables. I have been doing some testing with screwdrivers.
Effetto mariposa sealant does not disappear into my tyres but maybe it is the butyl or latex lining the IRC tyres have that stops that from happening.