Another Grimsargh dweller here, Longridge Fell is great for an explore, lots of little paths that you can link together with fireroad climbs.
Very muddy at the moment though. A good route is to start at Hurst Green and ride up the Sandrock bridleway to Crowshaw Farm and then get on the fell at the old quarry. Climb fireroads up to the Trig and then do some exploring! There’s a great route locally known as The Jungle. It starts at Sam’s Viewpoint and takes you right down to Kemple End (top of Birdy Brow).
Then you’ve got a nice climb back up the “7 Bends” fireroad.
You can probably work out a lot using Google Earth, but spend an afternoon up there and you’ll find most of the rideable stuff. There are usually other riders up there at weekends that will help point you in the right direction.
If you see a strikingly handsome man on an orange Cotic Soul or a white Blur, that’ll be me… 😉