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danb
What tyres and pressure are you using?
@sensom
I've got Rimpact front and rear, and I didn't notice any negatives once I'd installed them. I'm running 14psi in a 2.35 Hans Dampf - front and 17psi in a 2.35 Nobby Nic rear. Where I really noticed them was going over wet roots, they certainly allow the tyre to conform better and provide a bit of damping there, and I've set some of my fastest times on them as they increase grip therefore allowing less braking.
I'd say that the Rimpact has all the benefits of the Cushcore, but without the expense or the difficulty of fitting them.
Get tyre inserts in the calendar!