Fitting modern tires is also a suggestion to improve the handling. However, most modern tires may be much wider and have a lower profile than those used on classic cars when new, therefore they may interfere with suspension elements and the tire walls may become damaged. The suspension of a classic car may not be suitable for radial ply tyres, having been designed to only accommodate bias ply tires. Narrow classic car wheels may have been designed for narrow high-profile tube tires and not be suitable for modern tubeless radial tires. Another problem with modern tires on classic cars is that increased grip requires increased steering effort; many classic cars do not come with power steering. Many major tire companies have dedicated classic car tire marketing departments and will be able to give expert technical advice to address all these issues. It is important to know how radial tires will affect the performance of a car originally fitted with bias-ply tires, and the considerations needed to compensate for the differences.