Changing from 15” wheels to 16” on a Hymer Exsis Alko chassis.

[SaandCliffy]

I changed to Toyo Observe 225/70 R15 112/110 S
Contacted Toyo uk with my axle weights and they emailed me back with the recommended tyre pressures, which are considerably lower than CP at 80psi.


They are winter tyres, which makes them very good in the wet and on mud.
There is a drawback in that they allegedly wear quicker in all round year use.

In addition as they are much lower pressure and the side wall not as hard you get a much softer ride .
But, I have found that when parked up there is a shade more movement when walking about in the van. So I’ve taken to using our chassis steadies which seems to sort that out.

Ps: we have air assist on the rear which also helps with stability particularly when passing trucks.

Thanks I will take a look at the website. I am only 6m and no air assist

 

[Phill D]

Thanks I will take a look at the website. I am only 6m and no air assist

I bought them of a specialist tyre supplier on line, can’t remember who exactly, but I probably have the paperwork somewhere!

They delivered to our local tyre shop who fitted them.

 

[Garveypeter]

you need 3 measurements,

1. the diameter,
2. the width, 215, 225 etc ( depends on the alloys you buy)
3. the profile 70, etc

i.e. 225 x 70 x 16 ; remember the increase in diameter and choosen profile could affect your speedo readin, although in my experience it made it more accurate..

5 measurements, including centering ring diameter and rim offset.
Then you need to know the load rating of the rim.

 

[Phill D]

5 measurements, including centering ring diameter and rim offset.
Then you need to know the load rating of the rim.

So that’s 6 then not 5

 

[Bobby-gg]

You've all forgotten the 7th measurement - the idiot tolerance!

You know, the one's that say its fine to fit Discovery 120mm pcd to 3.5tonne+ Ducato 118mm pcd 'cos they've got wobble bolts!

^{_{Subscribers  do not see these advertisements}}

 

[Gerry77]

Well I collected the Exsis on Tuesday (round trip 700miles). On my way back I called into my local weighbridge and even with the garage full of a safari room, bags of tools and a full 11kg Gaslow bottle it weighed 2980kg. So better than expected.
Found a couple of niggles on the way but otherwise very pleased with it.

 

[The joker]

I changed to Toyo Observe 225/70 R15 112/110 S
Contacted Toyo uk with my axle weights and they emailed me back with the recommended tyre pressures, which are considerably lower than CP at 80psi.


They are winter tyres, which makes them very good in the wet and on mud.
There is a drawback in that they allegedly wear quicker in all round year use.

In addition as they are much lower pressure and the side wall not as hard you get a much softer ride .
But, I have found that when parked up there is a shade more movement when walking about in the van. So I’ve taken to using our chassis steadies which seems to sort that out.

Ps: we have air assist on the rear which also helps with stability particularly when passing trucks.

Hi Phil,
Good point's there I found the same but with the Falkens, What chassis steadies did you go for Alko or cheaper option's on Amazon?
TIA
Mark

 

[Gerry77]

Hi Phil,
Good point's there I found the same but with the Falkens, What chassis steadies did you go for Alko or cheaper option's on Amazon?
TIA
Mark

Which are the cheaper options for rear steadies on Amazon please?

 

[Silverman]

My Hymer on Alko chassis, has alloys with a pcd of 118. I've been trying for two weeks to get a spare wheel with this pcd. All that comes up are 15" wheels. I suspect that the Fiat chassis was originally on 15" wheels but Hymer put 16" alloys on when they upped the weight from 3500kg to 3850kg.

If anyone has a steel 16" wheel with 118 pcd that can take a 225/75/16 (120/121) tyre I would be interested.

Ebay item number 163867101488 Is what I bought.

 

[Phill D]

Hi Phil,
Good point's there I found the same but with the Falkens, What chassis steadies did you go for Alko or cheaper option's on Amazon?
TIA
Mark

I bought a pair of AL-KO removed from a Funster van on the classified.

The cheaper version work but they are not as easy to adjust.

^{_{Subscribers  do not see these advertisements}}

 

[Carpmart]

Another is to add to the list, rolling radius which is dependant on the tyres you select. This affects not only Speedo reading, but also final drive ratio…

Going from 15 to 16 will invariable hurt the ride as you’re going to have less tyre wall to remain largely the same rolling radius.