newcastlecycling

do you know roughly how long it is? and is the road steady enough and wide enough to safely average 30-35k/h

GCFR1 - the surface is evenly graded, as it is a former train line.  However, it is in parts a bit narrow (especially parts south of Whitebridge).  This means that the many walkers, joggers and bike riders mean there are times when you need to slow down and "single out" if riding with other cyclists. 

There are parts of the track where 30 - 35 kph is perfectly safe if there are not too many walkers etc around, but those same parts can be dangerous when there are high numbers of walkers etc.  You need to exercise care, as many people (including some cyclists) seem to have the very Novocastrian sense of self entitlement that means they have little regard for the other people that also want to use this very good public resource.

Unless you are fit enough to ride B grade or above you might struggle to reach 30  kph on the long climb north from Redhead.