We are often contacted about hubcentric wheel spacers for Fiats. In this post I will give a brief overview of the challenges with wheel spacers on a Fiat answer some of the common questions about them.
First of all, not all Fiat/Lancia wheel hubs are created equal. Many companies list Fiats as all having the same hub diameter. By measuring the actual parts, we’ve determined this is simply not true. Depending on what model you have, you will need a spacer designed for either a 58.5mm or 58.1mm hub.
The picture below is the design of the Fiat 124 front wheel hub which has a 58.5mm nose. The hub contains the wheel bearings which then ride on the front axle/kingpin.
The Fiat X1/9 is vastly different, however. As in the picture below, all X1/9 hubs (front and rear) have splines cut into them. The hubs ride on a splined axle/shaft and the bearings are in the hub carrier, a non-rotating member of the suspension. All of these hubs have a 58.1mm nose. Depending on which year you have, the nose may be shorter but still able to center a wheel.
Lancia hubs are a different design but 58.1mm as well.
X 1/9 Rear Hub
The Fiat 124 rear axle is different yet again. There is a 58.5mm hub but once you add the brake rotor, there is very little room for a wheel to center itself (6.66mm). The problem is even worse if you use the stock 5mm wheel spacer. The wheel is essentially not centered. This can be remedied by installing a hubcentric spacer, then indicating in to the rotating axis and then tightening the M8 bolts that hold the assembly together.
Fiat 124 Rear Hub
Knowing the hub diameter is the first step. Then you must determine the thickness of the wheel spacer. For testing purposes, we recommend stacking multiple stock spacers together and bolting on the wheel. This will give you a good idea of what the car’s stance will be and if there will be any interference problems. Do not drive around like this though!
On the Fiat 124 front hubs, you will see a small step. For spacers under 1″ you will have to use a centering ring like the one below and a non-hubcentric spacer. The reason being that if you added a very thin (.020″) hub to a spacer, it would just get mangled and be unusable. Thicker spacers allow you to have more hub material (.080″+) which is strong enough to center the wheel properly.
The Fiat X1/9 suffers the same problem but its minimum thickness is 5/8″
Fiat 124 Hubcentric Spacer
If you’d like to order wheel spacers from us, see hub centric wheel spacers in our webstore.