SMF - Just Installed!
None ! - The RST is not designed to take suspension forks - they're longer than the standard forks so would really upset the geometry of the bike.( & void your frame warranty !) - You'd be better off with a Thorn Sterling ( Or my Catalyst frame from the classifieds ! )
That is not entirely true! The Mk1 RST (long top tube variant) can be fitted with suspension forks. I don't know about the current version. Sjsc used to offer suspension forks as an option! I am pretty sure the forks they used were Magura Odur (85mm travel)