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Yeah I'm also running Reserve rims. The warranty almost makes me hope I crack a rim to get my monies worth... of course thats silly but it definitely gives some peace of mind experimenting with the pressures. The side load support of the insert is what I'm after.
I'm lucky enough to have a few short 2 minute steep enduro type runs 10 minutes from home in the car. Lower than 25psi and it gets squirmy and dings to the rim can be felt. From what @pit has said cushcore should give me what I want.
Not that they've turned up yet, nor that I have a bike to put them on, but I'm running SC Reserve so have the lifetime warranty, what attracted me to the inserts is the ability to run low pressure without the tyre folding over under side loading, and the promise of killing some chatter - which really killed my wrists on the Megatower last year.