You may find the suspension just fine seeing as the R is a dirt bike.

I myself, wouldn't touch the suspension on an R as you need soft suspension for riding the bumps. It's a different case on the X model as it's a road bike. The standard suspension on the X is fine for the road up to a certain speed. The spacer mod makes a much harder ride but gives me better handling and quicker steering when I'm pushing it. I personally wouldn't push an R model on tarmac as you won't have nearly as much grip as an X model.