What is the difference between the Sidi...
What is the difference between the Sidi SRS Grey Soles and the SRS Dragon soles. So both fit the same shoes?
Last time I used the grey soles and they wore out and tore out after less than two seasons.
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The SRS soles are designed to have a softer more aggressive compound which allows you better traction in all conditions and is (i hate to say this, but) designed to wear out like racing tires on cars, but not as fast, to provide you with the best performance possible in all conditions. This is a high performance shoe and this is one of the many great features of the shoes. The other side to the benefit, is that instead of having to replace your entire pair of shoes to get the fantastic performance, you only had to replace the soles.
as to your question of what is the difference in the soles:
The Dragon SRS soles have a slightly different design to work with the carbon soles that are lighter and stiffer than the soles on the pre carbon Dragon soles shoes and the new Spider shoes. if you are running the Spiders or the pre carbon sole Dragons, you hav ethe option of using the grey/yellow lugs or the black/red/yellow lugs (slightly harder compound - lasts a bit longer, less sticky on slickrock). If you have the carbon sole Dragons - i love these shoes, you need to use the SRS Dragon Carbon grey/red soles.
Spiders, Carbon dragons, or no carbon Dragon soles, you have made a great choice and have the best pair of MTB shoes on the face of th earth!! Ride em hard, pass our friends when you race and replace the soles every couple years, but finish first...
In theory the Dragon soles are supposed to be made of a harder compound to be more durable while sacrificing a bit of traction. The Spider soles are softer and wear faster but provide better grip. They both fit the same shoes.
In my experience, I've found the Dragon soles do not grip as well as the Spider soles, but they also have worn faster, lasting only 2/3 as long as my Spider soles. I've had two of each and both Dragon soles wore about 2mm down in about 600 miles whereas the two pair of Spider soles wore the same amount in about 1000 miles of off road. That's the complete opposite of what's supposed to happen and I'm still confused by it, but that's what happened to me.