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Hi, apologies for the slow reply. We asked the our Scarpa representative and he came back with this " We use 2 great rubbers that offer super grip. I guess the key is where and when you need it and does it come from the rubber or the lug depth? One super grippy rubber is on the Kalibra HT, Presa TRN-01 rubber which is a SCARPA development. It works really well on multi terrain in wet and dry conditions. Amazing grip on rock as well as wet grassy descents. This is supported by many runners at consumer demo events we have run. The second is a Vibram Megagrip rubber which we use on the Spin ST. This is a 7mm lug depth for incredible traction in mud but the rubber grips really well on the rock when needed. You guys stock both of these shoes." Hope this helps!

Also are they more cusioned than the VJ xtrm 2 but less than the ultra 2 and maxx 2?

Hi they are similar to the Xtrm 2 in length but wider. Not as wide as Altra and Topo in the toe box but much wider than other VJ’s - hope that helps.

@acceleraterunningco6769 thanks is there enough cusion for an ultra on technical terrain e.g. 50K or 50 miler?

It totally depends on what cushioning you are use to. Are you local to come and try them?

Do you have a link to the research by Munich university you cited that observed that 6mm lugs are optimum for trail shoes?

they are out now! We have them in store and online. www.accelerateuk.com/shop/scott-ws-supertrac-speed-rc/

What does RC stand for? I can’t figure it out lol

Hi Chris, the right shoe for you is one that matches your foot shape and style of running. Grip is also defined by the surface you are running on, as a shoe that grips on road it a different story yon a dirt track. If you are after a pair of shoes then follow the link below and come see us in store. www.accelerateuk.com/arrange-an-appointment/appointment-booking.php

This is where we have a differing in opinion between tester. I personally wear the same size as all my other shoes in these and they fit like a dream. If you want to chat it through more give the store a call.

I’m also true to size. Just fit perfect every time in saucony