Hi. Live on East Dartmoor. We’re around 35 mins from Winkleigh. Loads and loads of decent riding in the area.
As above, there is a good route out from North Bovey to Hunter’s Tor, Nutcracker, Lustleigh Cleave and then back via Water. Check the OS map, but there is also a lot of good off piste stuff in the same area.
For more open moorland ride, there are a couple of loops you can do heading out from Bennett’s Cross near the Warren House Inn. Following is a good widescreen ride if it’s dry with a mix of XC and more technical stuff, and can be linked with the Lustleigh loop if you want a big day of it:
Bennett’s Cross > Vitifer Mine > Soussons Down > Golder Dagger > Challacombe > Headland Warren > Grimspound > Hameldown > Natsworthy > Jays Grave > Hayne Down > Hound Tor > back to Grimspound the same way or via Bonehill and Heathercombe and then back to start via Headland Warren
Also google the Stepping Stones ride out from Bellever. Again best attempted in the dry.
Further west, there is a decent loop out from Princetown to Burrator via the Widowmaker and back on the old railway line.