I think they perform wery well on both gravel and tarmac, a good compromise for mixed driving.
Longlivity depends on use....
If you brake alot the front gets worn.
If you play around in gravel, the bak disapears realy quick also on fast high way.
I usualy get around 8000km on a set, with mixed driving. Slow driving in Norway
Touring two up (8000km) and solo i got 15000km on a back and front still going at 20000km.
Frode
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