Vehicle & Technical > Defender

Fitting monster tyres to my beast

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Budgie:
All my experience has been with Discos & Rangies but the same goes for 90s & 110s as well.

When you lift a vehicle then the lift will affect the steering, the turning circle is the easy bit! With a 2 or 3" lift then it effects the caster angle on the front and makes the steering light and it will have the tendency to wander and "tramline".  You can alter this back to normal by fitting caster correction radius arms, radius arm bushes or swivel housings but these all add to the cost.  If you go for the caster correction radius arms this will increase the angle of attack in the transfer box end of the front propshaft causing a bad vibration, meaning a Carden type front propshaft, again increasing the cost.

Going from 750's to 900's will also change the overall gearing and with a 2.5 N/A Diesel then you may find you're changing into 4th or even 3rd on some hills that you could take in 5th with the 750's. Having said that, it won't be as bad for the 110 as the transfer box gearing is higher than on the Disco so may not be as noticable.
The 900's will also mean your speedo will read approx' 5-7mph slow so you need to watch it in those 30mph limits!!   :wink:

I know it all looks grim, but it's better to know what can happen before you start, it makes it easier to plan ahead.  :D

snezza69:
Thanks for all that info, I may try the tyres on with the standard springs for size, I do anticipate having to adjust the front wheel arches a little, and I suppose with the natural increase in ride height of the 900's these factors will still be in effect (but not as drastic), so could you recommend a dealer who could provide me with the goods?

beast5680:
just popping in for a quick question save me starting another tyre thread :roll:
are 265/75x16,s bigger than 235/85x16,s?

Jim-Willy:

--- Quote from: "beast5680" ---just popping in for a quick question save me starting another tyre thread :roll:
are 265/75x16,s bigger than 235/85x16,s?
--- End quote ---



Wider but slightly shorter.  Don't like em myself but plenty of folk use em, higher flotation, like you can float a landy!

Jim-Willy:

--- Quote from: "snezza69" ---Hello all, I have aquired a set of brand new 900's on offset 16 inch rims to go on my 1983 110 diesel pickup.  At the moment I do not have enough clearance at the front end, and probably not at the back off roading, without cutting the wheel arches.  I am looking at probably lifting the suspension by about 3 inches.  Has anyone done this for 900's?  Anyone got any suggested suppliers of springs and shocks for this?  I don't have a massive budget but would like some options.  I bought the thing to have some fun off road so this is the primary role for it but it still needs to get me to work.

Thanks all.
--- End quote ---


The lad that balanced my 235's at ATS said i could fit 900's on the 90 without moddin' the suspension, cos I thought 235 was as big as i could go, he should know, its his job.

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