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What are the differences between Lug Centric / Hub Centric ?

What are the differences between Lug Centric / Hub Centric ?

Hub-Centric
Nearly all OEM Wheels are designed to be hub-centric. The automaker designs an OEM wheel to fit on a certain car or range of cars. The center bore of the wheel is sized to fit perfectly onto the axle of that car. This is a hub-centric connection, as the wheel is centered by it's connection to the axle hub. The lugnuts hold the wheel firmly to the mounting plate, but it is the wheel-to-axle connection that actually holds the weight of the car.
This is important because the lugnuts are designed to handle lateral forces that push the wheel away from the mounting plate. The forces that the hub and center bore connection are designed to withstand – the weight of the car forcing downward and impacts forcing upward – are at right angles to the forces that the lugnuts are designed for.

Lug-Centric
This means that when the wheel is installed, there will most likely be a space between the axle and the hub instead of a firm contact. The wheel is therefore lug-centric, as the wheel is centered by the lugs rather than by the hub. Some aftermarket wheel makers advertise that all of their wheels are in fact hub-centric – what this means is that they provide the proper spacers for the customer's car, not that they custom-make their wheels for the many hub diameters out there. Do not make the mistake of thinking that spacers are optional equipment, or that a retailer is trying to upsell you on some useless accessories. Hub-centric spacers are actually about as necessary for aftermarket wheels as lugnuts are. Keep the proper fitment for your wheels and you'll be driving happy for a long time.