There is far less abrasive resistance on gravel than on a sealed surface, On seal, the surface is pure chip with sharp edges that are fixed to the road, The top course or running course on gravel is a mix of smooth stone and chip, the chip size is bigger than seal, (Normal for a top course its 20mm, Also the stone on gravel will move along with you to some extent which is why braking distance is a lot further on gravel than seal.
If the liner in a pair of Jeans is tested to hold together for certain time at 110 kmh on seal as claimed then it will be a lot longer on gravel, I think technology has moved along with some materials such as Dyneema being stronger than steel for a given diameter in a winch cable. A pair of lined Jeans with the same Hip and Knee Armour in pockets as textiles to me now has to be right up there for protection.
I was brought up old school but with my trade and in the industry I work in Ive had to accept modern technology, there is some pretty amazing stuff around now.
But as with everything, It boils down to personal choice.
COP, "Ive been waiting to catch you all day"
BIKER "Sorry officer, I got here as fast as I could"
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