Ideally, the nosewheel should be eased off the ground between 115 and 135 knots depending on configuration.However, on some aircraft, with the CG well forward, it may prove impossible to lift the nosewheel within this speed band. Under the worst conditions of CG and rigging tolerances, it may be neccessary to attain 150 knots before the nosewheel can be lifted.
That's word for word, including the spelling mistake, from the (how to fly a hunter) manual.