Went and did this today. 5 miles downhill 10 miles gently rolling then 1 mile hill then down and hill to the finish.
Did it on my road bike as i wast sure if I had the bike handling skills needed this was a misjudgement as the downhills were mostly gradual and the rolling 10 miles into the wind drained me. Then got stuck behind a tractor on the i mile hill and had to do a kamikaze overtaking manoeuvre to get by.
Good fun, not many entrants perhaps we could have some more Ogmore members in it next year.
Even got a medal for 2nd vet in my age group, though some of the older ones were faster than me!
Highly recommended don't let the few small hills put you off.
And take your own mug, the Bynea club run arrived just before me so I was at the back of the queue for tea no mugs by the time I waited 15 mins. Eventually got a thimble of tea. Thought perhaps the riders might have been served first!