A telescopic steering column assembly (100, 200) comprising an upper shroud portion, a lower shroud portion, the two shroud portions being able to move relatively along a common linear path during telescopic adjustment, a telescopic steering shaft (3, 4) that passes through the upper and lower shroud portions and is supported by the shroud portions through at least one support bearing assembly that acts between an upper portion of the telescopic steering shaft and a lower portion of the shroud that move relative to one another axially during telescopic adjustment of the steering assembly for reach, the support bearing assembly in use removing free play between the shaft and the shroud portions that would otherwise occur in at least one direction orthogonal to the telescopic movement, in which the at least one support bearing assembly comprises: an inner bearing race which is located on the shaft, an outer bearing race that is located on an inner face of the shroud, and a set of ball bearings that are located between the inner bearing race and the outer bearing race and are free to roll along bearing surfaces defined by the bearing races, characterised in that: each of the inner bearing race and the outer bearing races comprise a pair of annular bearing race parts, each part defining a circumferentially extending bearing surface of the respective bearing race, the two parts of each pair being arranged coaxially and spaced apart from each other axially such that varying the spacing between the two parts varies the effective radius of the bearing race, the support bearing assembly further comprising: an inner annular support sleeve that is located between the inner bearing race and the inner shaft, an outer annular support that is located between the outer bearing race and the shroud, and a biasing means that in use applies an axially directed thrust between a first one of the annular support sleeves and one of the respective bearing race parts, and in which the bearing assembly is arranged such that the axial thrust applied by the biasing means is converted into a radial thrust that is applied to the inner bearing race and outer bearing race to force them into engagement with the inner and outer sleeves respectively. an inner bearing race which is located on the shaft, an outer bearing race that is located on an inner face of the shroud, and a set of ball bearings that are located between the inner bearing race and the outer bearing race and are free to roll along bearing surfaces defined by the bearing races, characterised in that: each of the inner bearing race and the outer bearing races comprise a pair of annular bearing race parts, each part defining a circumferentially extending bearing surface of the respective bearing race, the two parts of each pair being arranged coaxially and spaced apart from each other axially such that varying the spacing between the two parts varies the effective radius of the bearing race, the support bearing assembly further comprising: an inner annular support sleeve that is located between the inner bearing race and the inner shaft, an outer annular support that is located between the outer bearing race and the shroud, and a biasing means that in use applies an axially directed thrust between a first one of the annular support sleeves and one of the respective bearing race parts, and in which the bearing assembly is arranged such that the axial thrust applied by the biasing means is converted into a radial thrust that is applied to the inner bearing race and outer bearing race to force them into engagement with the inner and outer sleeves respectively. each of the inner bearing race and the outer bearing races comprise a pair of annular bearing race parts, each part defining a circumferentially extending bearing surface of the respective bearing race, the two parts of each pair being arranged coaxially and spaced apart from each other axially such that varying the spacing between the two parts varies the effective radius of the bearing race, the support bearing assembly further comprising: an inner annular support sleeve that is located between the inner bearing race and the inner shaft, an outer annular support that is located between the outer bearing race and the shroud, and a biasing means that in use applies an axially directed thrust between a first one of the annular support sleeves and one of the respective bearing race parts, and in which the bearing assembly is arranged such that the axial thrust applied by the biasing means is converted into a radial thrust that is applied to the inner bearing race and outer bearing race to force them into engagement with the inner and outer sleeves respectively. an inner annular support sleeve that is located between the inner bearing race and the inner shaft, an outer annular support that is located between the outer bearing race and the shroud, and a biasing means that in use applies an axially directed thrust between a first one of the annular support sleeves and one of the respective bearing race parts, and in which the bearing assembly is arranged such that the axial thrust applied by the biasing means is converted into a radial thrust that is applied to the inner bearing race and outer bearing race to force them into engagement with the inner and outer sleeves respectively.