Rim advice for upcoming july Madigan line crossing

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Originally Posted by rstevensen

Hi everyone, I am after some advice on the most feasible way forward. I need a second spare for my current set of dynamic steel rims fitted with 245x75 16 for my 2003 Discovery 2 td5. The rims are 16x7 with a positive 30 offset, 1400kgs. I learnt that this model has been discontinued. The available options to me are:
get 16x8 30+ offset 1200kgs
get 16 x7 25+ offset 1200kgs
use the oem alloy rim
keep on watching the forum (have been for a few months now with no luck)

Thanks in advance for your advice

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The most important thing IMO hasn't been mentioned. Make sure the rolling diameter of the extra spare is the same as the existing tyres. Especially important for diff locked vehicles, but also for standard diffs.

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Originally Posted by DiscoMick

For myself, I hate removing flats and fitting tyres to wheels, so I'd just take the OEM alloy (maybe even two). You know it fits and hopefully you won't need it, so problem solved.

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First of all, thank you. My understanding, maybe incorrect, is that the load rating for alloy wheel is only at 940kgs. This does not give me a lot of wriggle room if i have to fit it in the rear (axle load on the rear is close to 1800kgs).

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Originally Posted by rstevensen

First of all, thank you. My understanding, maybe incorrect, is that the load rating for alloy wheel is only at 940kgs. This does not give me a lot of wriggle room if i have to fit it in the rear (axle load on the rear is close to 1800kgs).

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It's still within the load rating for the alloy.

BTW I was assuming from your first post that the rolling diameter was the same for both the steel and OEM alloy. If it's not, then my comment doesn't apply.

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Originally Posted by rstevensen

First of all, thank you. My understanding, maybe incorrect, is that the load rating for alloy wheel is only at 940kgs. This does not give me a lot of wriggle room if i have to fit it in the rear (axle load on the rear is close to 1800kgs).

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Not sure with the D2, but my D1 was 1880kgs on the rear axle when we went to Melrose over Easter. I was more worried about the tyres (passenger carcase, rather than LT) - they were rated at 975kgs each, so we were right on the limit. Kept the speed down and watched the wheel placement - no problems. Even climbed Big Red fully loaded! [emoji106] [emoji106]

Not wanting to go too far off thread - correct me if I'm wrong, but simply put, I thought rolling diameter was an issue for viscously coupled systems and not mechanically coupled systems?

Similar diameters = less strain on any differential system. Doing something like the Madigan Line puts enough strain on the drivetrain, without adding unnecessary extra work for the system to do (in my opinion, of course)

I needed a 6th for the trip we're currently on. D2 has 8" wide alloy rims, have a set of 7" alloys, so borrowed the spare (same tyres) off work dmax and fitted to 7" alloy ... It's a spare, it's on the roof, I've plugged one puncture, and haven't touched the spares.

No reason why the factory alloy can't be used as your second spare.

Don't over analyise it.

Alloy rims will be fine, ditto any of the steel rims mentioned. At the end of the day it will be the lowest weight capacity of the drive line component that will the limitation. No use having 1200kg rims as the rear axle on a D2 is only rated at 1800kg and in this case the tyre will need to have a minimum load rating of at least 900 kg (104 index) or better to cope.

I'm just about to head out on an extended 7500km lap through the central Aust, via Laverton and Warburton. For the first time since I stopped using split rims, I'll be carrying a second spare, but only to cover the unlikely event that I'm ham fisted enough not to notice a flat and I shread a tyre or break the bead. I'm running std alloys with 245/70 LT tyres.

Cheers

Steve

Don't forget the alloy wheel nuts if you make that choice

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Originally Posted by Rok_Dr

Don't over analyise it.

Alloy rims will be fine, ditto any of the steel rims mentioned. At the end of the day it will be the lowest weight capacity of the drive line component that will the limitation. No use having 1200kg rims as the rear axle on a D2 is only rated at 1800kg and in this case the tyre will need to have a minimum load rating of at least 900 kg (104 index) or better to cope.

I'm just about to head out on an extended 7500km lap through the central Aust, via Laverton and Warburton. For the first time since I stopped using split rims, I'll be carrying a second spare, but only to cover the unlikely event that I'm ham fisted enough not to notice a flat and I shread a tyre or break the bead. I'm running std alloys with 245/70 LT tyres.

Cheers

Steve

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Have a great trip.
I did the Simpson, French line, 3 years ago without any tyre issues, hoping the same for the Madigan. I have 120 rate LT tyres and a heavy duty Ashcroft rear axle. And yes, I have been known to sometimes be over cautious .