question on wheels/rims for Jayco

Daveenshaz · Newbie

question on wheels/rims for Jayco

Tony Bev · Guru

Hello Daveenshaz

I am not a Mechanic/Tyre Fitter, so I could therefore be wrong

May I be one of the first to welcome you to the forum

If the axle is still the same length, and the spring hangers have not been altered (same width position on the chassis), then the offset of the original rims, should be the same offset as what you will require in the 16 inch rim size

This site tells you how to measure the offset of your original rims

I am sure that if others have made the same modifications, they will advise what rim offset they now have

Hope this info was useful to you

erad · Guru

Run a tape measure across the front and rear of the tyres to check the toe-in or toe-out, Theoretically, the tyres should have toe-in (I cannot understand why, but AL-KO told me that they do it for stability reasons). If you have flipped the axle, you may now have toe-out and will wear your tyres on tne inside edge. If you do have toe-out, you may have to remove the axle, remove the brakes and then rotate the axle Left to Right and refit the brakes (they will be the wrong way round after the flip.

Peter_n_Margaret · Guru

I suggest you set it up to use EXACTLY the same rims and tyres as are fitted to the tug.
Provides a lot of flexibility and allows tyres to be moved about at will so they get worn out instead of dying of old age.

Cheers,
Peter

PeterD · Guru

I would suggest that you take the old rim to the place where you are ordering the new ones. Let them measure the offset, there is less chance of a mistake being made and if there is a mistake then it is theirs and not yours.

There is another potential problem for you. Are you intending to go from 14" rim to the 16" size. If so, do you realise that electric brakes have different ratings for 13/14" and 15/16" wheels? To check whether your axle will not be down rated too much can you supply the figures for the current size of wheel/tyre, the group axle capacity of the axle/s and the ATM of your van (the 2nd and 3rdfigures will be on the compliance plate.)

-- Edited by PeterD on Wednesday 21st of September 2016 11:18:43 PM

DonVicki · Member

daveesnhaz hi there, if I was you I be getting some advise from some trailer manufactures or repairers as I was once told that for every inch you increase the wheel size you loss 100kg off the axle, also brakes size is also governed by wheel size and trailer weigh, may need to go bigger, then there is the axles / springs and spring hanger size, may need to go bigger, will they be strong enough to carry the extra weight and stress of larger heaver wheels.
May be ok on the blacktop but gravel roads will soon find the weaker parts
Good luck
Don

Red Roo · Member

Recently I put my Prado's spare onto my 2004 Jayco caravan to see if it would fit. While it did, the caravan used 15" tyres but the Prado used 17".

I talked with the local Bob Jane people who checked and the end result was to get 2 new tyres and rims that would suit the Prado and also the caravan. As it turns out, the center or hub of the rim can be at different positions compared to the front and back edges of the rim, and this is quite important here. The caravan needed rims with a near zero offset, while the Prado had (I think) a positive offset.

The end result is that my caravan now runs 17" tyres on rims that are interchangeable with those on the Prado. My advice is to talk with the people that you'll be buying the tyres from.

OutbackMK · Senior Member

I have 16 wheels but the stud pattern is different between the 70 series Landcrusier and the van so I will need to get (conversion spacers 6 stud to 5 stud) this will allow the offset issue relating to the 285/75R16 tyres scrubbing on the van (van has 235/70R16) to be resolved as well so I don't have to worry about any of the spares having incorrect offsets. I don't like the idea of spacers on the tug as apart from being illegal there is a lot of stress put on the driven rear wheels vs the rolling only wheels on the van and the spacers will be solid billet and locktighted on.
Plan will eventuate when i find some cheap alloy 70 series wheels and the van tyres start to get long in the tooth meanwhile I travel with bead breakers tyre levers and some tubes and tyre patches should keep me out of trouble.