A steering wheel includes a boss for fastening the steering wheel to a steering shaft. Among other features, the steering wheel has a pair of lower spokes that are deformable to absorb energy in a collision. The boss conserves space and has relatively long splines for engaging the steering shaft. The boss includes a plate that facilitates insert molding and conserves space. The spokes include integrally formed airbag supports. A bolt retainer is included in the steering wheel. The bolt retainer holds a bolt for tightening the boss on the steering shaft, and the bolt retainer permits one-handed attachment.