I'm puzzled - what do you mean, 'a junior frame' ?
Dolan's website
http://www.bikes-dolan.uk.com/ says- yet it comes in sizes from 45 to 60
How many juniors will fit a 60cm frame ?
How, other than being smaller
(which this one isn't !), is a bike 'junior sized' ?
Perhaps it doesn't really mean 'junior sized', perhaps it means 'beginner-friendly' ?
Or maybe it did just initially come in small sizes and now they make bigger ones but just haven't updated their sales blurb ?
I can see, comparing the Pre Cursa (which presumably is a play on 'precursor') & Track Champion geometries that it has longer TT and slacker angles, so presumably it'll be a bit more 'road-bike-like', less of a twitchy out&out track racer.
Mcr velodrome has a hire fleet of Dolans, which I assume to be Pre Cursa's - you'd want the bikes which track novices would turn up to ride at Taster sessions to be a bit more forgiving ?