Originally Posted by Werks

Yes the soft aluminum shoes bite better. Being a softer material they provide less slip when engaging. Wear is pretty good on them so do not be concerned about them being one run type shoes or anything like that ;-) Remember that the soft aluminum and carbon shoes are simply tuning aids that are going to allow you to "fine tune" your clutches performance to the track conditions of the day. So we generally start off with the standard aluminum shoes and 1.0 springs and then adjust from there. For high bite/blue groove conditions where you can put the power down without wheel spin we will then go to a more agressive (less slip) type clutch set up by either going up in spring rate to increase engagement RPM and/or also gonig to either 2x soft aluminum/2x normal aluminum shoes for less slip or to 4x sof aluminum shoes (for an even more agressive clutch engagement).

Hope that helps! Let me know if you have any additional questions?