Tyres Scrubbing on Flex...........

[mike_beecham]

Hi All
I am very confused.
I am running 255/85 16 BFG MT's on BOOST alloys on my TD5 Defender.
I have this tyre size on 3 Defenders.

However, it seems that one of the rear tyres is scrubbing the spring hanger when flexed. There is less distance between the tyre and spring hanger on each side. Strange.

I have KING springs (20mm lift) and TerraFirma shocks fitted. I cant understand what is happening?

I have had this tyre size fitted to a standard height Defender without incident???

Any ideas??

Mike

[87County]

Could the wheel offset be different from previous ?.... or are you saying that the subject wheels are the same wheels you had on previous models ?

[mike_beecham]

Well...l have never added offset to any previous Defender.
When l look at the rear wheels - the Drivers side appear tucked further in the guards then the Passenger side.

Only just noticed this? I have never come across this before???

Mike

[isuzutoo-eh]

Measure the wheelbase on each side. You may have different length trailing arms, or perhaps a bent trailing arm, which will move one wheel forward and angle both wheels relative to straight.

[mike_beecham]

Thanks for that.
This is possible l guess.

I have the rear ball joint done recently and my mechanic said nothing. WHat is best way to measure wheelbase??

Mike

[n plus one]

Hi All
I am very confused.
I am running 255/85 16 BFG MT's on BOOST alloys on my TD5 Defender.
I have this tyre size on 3 Defenders.

However, it seems that one of the rear tyres is scrubbing the spring hanger when flexed. There is less distance between the tyre and spring hanger on each side. Strange.

I have KING springs (20mm lift) and TerraFirma shocks fitted. I cant understand what is happening?

I have had this tyre size fitted to a standard height Defender without incident???

Any ideas??

Mike

255/85r16 tyres on Boost rims will scrub the top of the rear spring hangers under articulation - not enough offset to the rim.

Is it the passenger side?

[mike_beecham]

Yes - scrubs passenger side.
But - there is more room between the tyre and the spring hanger on the Pass side compared to the Drivers side!???

[n plus one]

Yes - scrubs passenger side.
But - there is more room between the tyre and the spring hanger on the Pass side compared to the Drivers side!???

Most of the ones I've seen are the same. Either get new rims or, better yet, don't worry about it :D

[jimr1]

Hi Mike , This came up a few weeks ago same problem . This happened to me as well on my 110 . I put 265x75 x16 disco rims , and like you found they rub the inside of the rear tyre, I didn't like that . I brought 5 new 20m offset rims they stop this happening , and also keep It legal ,not overhanging the guards . They also give a better track width . It was also pointed out that if the tyre rubs at any part then It is not road worthy . I hope this helps . cheers . jimr1:)

[mike_beecham]

Thanks everyone for the info.
I shall hunt up some steel wheels.

Mike

[Bush65]

I'm not saying don't change to wheels with the correct backspacing, but this doesn't address the issue of why one wheel is closer to the spring perch than the other.

The first thing I would check is to measure from the chassis rail to the outer edge of the spring perch on both sides.

Now some people have reported their spring perch offset is not equal, if this is found to be the case, then less wheel backspace is the easiest and appropriate fix.

Also measure from the inside of the wheel rim to the chassis rail on both sides (vehicle needs to be sitting level when this is done, i.e. both spring heights equal).

If they are different then the 'A' frame alignment would appear to be out. Try correcting the alignment where the 'A' frame bolts to the cross member, but I'm not sure if the later models have the bolt on brackets.

[n plus one]

I'm not saying don't change to wheels with the correct backspacing, but this doesn't address the issue of why one wheel is closer to the spring perch than the other.

The first thing I would check is to measure from the chassis rail to the outer edge of the spring perch on both sides.

Now some people have reported their spring perch offset is not equal, if this is found to be the case, then less wheel backspace is the easiest and appropriate fix.

Also measure from the inside of the wheel rim to the chassis rail on both sides (vehicle needs to be sitting level when this is done, i.e. both spring heights equal).

If they are different then the 'A' frame alignment would appear to be out. Try correcting the alignment where the 'A' frame bolts to the cross member, but I'm not sure if the later models have the bolt on brackets.

Fair call, but I'll reiterate that every single one I've seen has less offset on the passenger side - buggered if I know why, but there it is :confused:

[frantic]

Yes my defender with a similar setup did the same, 2in and Gwyneth Lewis kit with N73L OME shocks. I kept the boost but put in aluminum billet spacers, yes not legal but neither is rubbing tyres, in the future looking to get some neg offset wheels and 315's