The KTM 990 SMR is the track-ready version of the standard SM. MCN's Adam Child has ridden the bike at the launch and you can read his full road test in this week's MCN, on sale February 25th.
The engine is unchanged from the SM version, instead the differences can mainly be seen in the chassis and parts. Both bikes use WP suspension, but the track-focused R version has different fork internals and less suspension travel at the front and rear.
The R version also boasts lightweight Marchesini aluminum wheels, reducing unsprung weight and overall mass, and the same race-spec Brembo brakes as the new KTM RC8R.