Cycling on the Ridge is fun.... though tiring, as it's not flat ( as in smooth ) Try to avoid leaving your vehicle in an official ridgeway car park as it screams " this car will be unattended for the next few hours... "
There are a few nice hills to play with, and some sections are narrow footpath near Goring, so you'll have to walk those bits ( detour via the shops/pub if you so wish ) There's a great bit of technical single track down ( from the Ridge ) to the Village/Hamlet of Ginge, then 100mtrs of road, and back up a bit of singletrack to make it a challenge.
Do try + visit the Court Hill centre, they have great cakes + hot drinks though check opening times first. they also have somewhere to water your horse.... or park a cycle for an hour or 2.And beds if taking longer.
Make sure your brakes work well,( eg really stop you, no point having "squeeze+hope", you can get up to 40mph in places......) fit good, fat, grippy knobbly tyres. Plenty of drink, as it can be a tad exposed in the sun+wind , basic tools+spares, and have a ball up there.
I can't make it, though I know a few who have run the whole length....