if you mean to set your spring sag
you need to measure from axle to a point up on bike
like edge of mudguard with the bike on a stand with wheel off ground
note the measurement
drop bike off stand and sit on bike preferably with riding gear and boots on
take another measurement from same place
on your rm465 you should have about 100 mm of sag
so just adjust spring colletts up or down to
get the right measurement
and you will be laughing