as I posted in the bar;
Using OS explorer maps 225 and 227, these lanes should in theory all be easy on a big bike with road tyres, I've done it from memory though so proceed with caution!! ,google earth street view pics are quite old, the signs you see on the byways may differ from those shown in the photos. (Herts TRF recently got an erroneous no motorcycle sign removed on a lane off the B660 for example)
You may as well ride up the B660, or associated minor roads to get near these lanes,
in which case, might as well take a de-tour along Graze Hill, it's a highway, but quite narrow and twisty and rural
https://www.google.co.uk/maps/@52.17098 ... 312!8i6656225 088 715 Cockway Lane - ride this lane from the west, it is graded for the first half mile, after that do a u-turn at the gate, or tip toe along, I dropped a GS650 Sertao there on road tyres though....
here is a video of me doing exactly that! (
https://www.youtube.com/watch?v=ISU9Zjf_r18)
https://www.google.com/maps/@52.3316749 ... 312!8i6656225 TL 083 688 Sandy Lane
Ride this south from the Tilbrook end, stop when it gets muddy and turn round, if you chose to continue, the lane meanders left, dodge the holes, then turns right down a slope with some ruts - be sure you want to go down there, as at the bottom just after it turns right there is a gate this is the Bedford Borough / Cambs border, at the moment the lane is closed beyond that point by Beds Borough Council, so you'll have to go back up the rutted slope.
https://www.google.co.uk/maps/@52.30673 ... 312!8i6656227 TL 149 824 Bullock Lane
https://www.google.com/maps/@52.4076621 ... 312!8i6656227 TL 067 867 Roberts Lane (make sure after a few hundred yards you turn sharp left, do not carry straight on, it is private)
https://www.google.co.uk/maps/@52.46841 ... 312!8i6656227 TL 059 874 to 074 908 long series of lanes, goes through a rifle range, if red flags are flying stop...
https://www.google.com/maps/@52.4746616 ... urce=apiv3and also onto
https://www.google.co.uk/maps/@52.48929 ... 312!8i6656