Fiat Ducato and Peugeot Boxer Motorhome wheels.

by chris sanders on 13th April 2017

It is very common for motorhome owners to fit alloy wheels to their vehicles. But which ones to go for? Are they safe? How do I know that they will fit? I will aim to answer these questions and more within this article.

Campers that are based on, a Fiat Ducato & Peugeot Boxer chassis will be one of two variations, either the light chassis or a maxi chassis. Just to complicate thing further the company’s selling these Motorhomes do not know what chassis the vehicle is based on. Two variations means two different stud patterns “PCD” and centre bores.

The first step.

This would be to determine your stud pattern, the two stud patterns are 5×118 and 5×130 this is the same for both the Ducato and Boxer. The easiest way to find this out is to take a measuring tape and pick one bolt and measure from the centre of this bolt to the one directly next to it, depending on your chassis you will have one of two measurements and these are as follows, 71mm = PCD 5X118 & 78mm = PCD 5X130. The light chassis is 5×118 and the maxi is the 5×130 it’s that simple.

Secondly centre bore.

The centre bore, what is the centre bore? This is important because this takes the weight of the vehicle. A wheel fitted with the incorrect centre bore can cause all sorts of problems, not only is this a load bearing part it is also a centralizer ensuring the wheel is sat on the hub 100% true. Wheel vibration is a good indication as the wheels are not sat 100% true. Wheels used on vehicles with a centre bore which is too large will also put unnecessary stress on the wheels bolts that are only there to hold the wheel to the hub and not to be the loaded bearing part of the assembly. Oversized centre bores can be brought down to size with a Spigot ring, although there is nothing wrong with using a spigot ring we as a company would recommend fitting wheels which have a direct fitting centre bore. The centre bore of the light chassis is 71.1mm and the maxi chassis is 78.1mm.

Thirdly the offset for the wheels.

The offset of a wheel is what position the wheel will sit on the vehicle, higher the number the further in towards the suspension it sits and smaller the number the closer it sit towards the outer wheel arch. Offsets can cause all sorts of confusion. The Peugeot and Fiat will safely allow the fitting of a wheel with the offset of et55 – et68 the offset also depends on the wheel width.

 

Save the most important to last the Load rating.

I do not think I need to say this but I will, the load is the most important factor when buying wheels for your Motorhome.

Let us look at the 6-wheeler tag axle,

When looking at wheels you need to know what the gross weight is over the rear axle, you could have a vehicle that weighs 5000kg but 3000kg’s could just be over the rear axle. The wheels load rating is so important and needs to be understood, when you see a load rating of 1250kgs this is per wheel four of these will give you a total load rating of 5000kgs just on the rear and 2500kg across the front. This combination will give you a total of 7500kgs across all six wheels. Again I cannot stress enough quality is the only way to ensure safety, there are many cheap wheels out there but they are just not up to the job. The best way to ensure quality is TUV approved wheels these come with an approved certificate listing maximum weights. And is available on request.

“SIMPLY ASK FOR THE CERTIFICATE AND IF THE SUPPLIERS SAY I DON’T HAVE A COPY THEN STAY AWAY BECAUSE THEY CANNOT PROVE THEIR QUALITY”

 

Now we have found what wheel we need.

Normally customers will come and have their wheels fitted here in Hull, as we offer a mail order service customers will sometimes take on this job themselves so a few pointers are needed here.

 

Wheels bolts do you have the correct ones?

Back in the day when I used to fit alloy wheels to a local manufacturer, we would have one set for alloy wheels and another set for steel wheels. This has changed somewhat over the years fiat especially, Fiat now uses the same wheels bolts for both steel and alloy. 21mm head 32mm in length, the thread is 14×1.5 on the Light chassis, and the Maxi chassis use a 21mm head 32mm in length with a thread size of 16×1.5 both having a 60-degree taper seat.

“Again another good sign for which chassis you have”

Maxi chassis bolts measure 16mm across the tip of the thread

Light chassis bolts measure 14mm across the tip of the thread

 

When buying wheels this question needs to be one of the first. DO THEY TAKE ORIGINAL BOLTS? Now there is nothing wrong with using non-original bolts, but you need to be certain as there are two factors in play here.

  1. The length of the bolt and let us take the Light chassis as an example. Standard length 32mm! You buy a wheel in good faith and have been told these wheels will use original bolts. But unknowingly the bolt length needed in a lot of cases is 35mm the difference in the 3mm means up to two fewer turns and could result in the wheel coming loose.

 

  1. The taper of the original bolt is quite large compared to a standard aftermarket bolt. Using an aftermarket bolt with a smaller taper on wheels, which take original bolts, could sink into the wheel to far making them too long. Bolts that are too long could bottom out before the wheel is fully tightened resulting in the wheel coming loose.

 

“Again Buy TUV approved wheels these will have all the correct information regarding bolt length”

 

 

 

 

Wheels torque settings.

Torqueing your wheels is so important if you were to overtighten your wheel bolts these could just sheer off. Under tightening could lead to the wheels coming loose or even falling off and nobody wants to experience that.

Fiat

Fiat Ducato Maxi 2007-2017 “5×130 PCD” torque setting: 140nm

Fiat Ducato Light 2007-2017 “5X118 PCD” torque setting: 125nm

 

Peugeot

Peugeot Boxer Maxi 2007-2017 “5×130 PCD” torque setting: 120nm

Peugeot Boxer Light 2006-2017 “5×118 PCD” torque setting: 125nm

 

Once you have your wheels fitted and all torqued up nicely it is advised that these be re-torqued after 50 kilometres.

 

Weight saving the myth.

There seems to be a belief that swapping onto alloy wheels will offer a dramatic weight saving, freeing up some load capacity for a few more cases of French plonk! Unfortunately, this is not really the case, Motorhome alloys are of a similar weight to a steel wheel. This due to the amount of aluminium required to get to such a load capacity.

 

Hope you find this helpful Tyremen.co.uk

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