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Coed y Brenin is rideable but on HT, Nant yr Arian is real nice but where else is great for a HT (Prince Albert 120mm) I really Need to explore a bit more!
Bare in mind I'm in Nottingham 😀
Anywhere in the Peak District will be fine on a hard tail and most of it no more than an hours drive
Anywhere? Hardtails are great fun no matter what you ride!
....but, I understand that's not helpful, so:
Peaks
Cannock
Sherwood Pines
Llandegla
Greno/Wharncliffe
Penmachno
Snowdon
North Wales in general
shock horror, they can all be ridden on fully rigid too!
not saying that you [i]should[/i] ride rigid, but just that don't be afraid to try stuff on your HT - enjoy it