Yet another T6.1 Suspension question!

[Fishinbrine]

After reading loads on here, I see 265/40R20'S are very popular, are these still good with 8.5J wheels? Also, I didn't want to replace the rear tyres just yet, they have only covered 14,000 miles and still very good, can I stagger front and rears keeping my 275/40R20'S on the rear and 265/40R20'S on the front? I get they are a slightly different rolling circumference but is it too much to upset the van?
Thanks again all!

 

[Drive Wayne]

After reading loads on here, I see 265/40R20'S are very popular, are these still good with 8.5J wheels? Also, I didn't want to replace the rear tyres just yet, they have only covered 14,000 miles and still very good, can I stagger front and rears keeping my 275/40R20'S on the rear and 265/40R20'S on the front? I get they are a slightly different rolling circumference but is it too much to upset the van?
Thanks again all!

Are you 4mo?

 

[Fishinbrine]

Are you 4mo?

Nope not 4 motion, but is a T32 so need to keep load ratings of course

 

[Drive Wayne]

Nope not 4 motion, but is a T32 so need to keep load ratings of course

Is the rating 103+ ?

 

[Frigo110]

After reading loads on here, I see 265/40R20'S are very popular, are these still good with 8.5J wheels? Also, I didn't want to replace the rear tyres just yet, they have only covered 14,000 miles and still very good, can I stagger front and rears keeping my 275/40R20'S on the rear and 265/40R20'S on the front? I get they are a slightly different rolling circumference but is it too much to upset the van?
Thanks again all!

I would go with 245. 265 on a 8.5J is too big.

 

[Drive Wayne]

I would go with 245. 265 on a 8.5J is to big.

Where's @BognorMotors when you need him!

 

[Drive Wayne]

Nope not 4 motion, but is a T32 so need to keep load ratings of course

A few of us have 245/45 on the front 8.5's and 275/40's on the rear 10's, almost identical rolling radius that way, on 20's. As you say, make sure the load rating is right!

 

[Fishinbrine]

I have to agree 275's on a 8.5J don't seem right, it's on the spec sheet as 8.5J's but have just been and measured with a tape measure (can't see the markings with wheels on) and they measure as 9.5 inches

 

[Frigo110]

You measured between the tyre mounting flanges - not the outside?

 

[Drive Wayne]

My local tyre place (who I don't use any more) managed to mix my wheels when I originally got rid of the ditchfinders that were on after I picked up the van! Easy to do for an untrained eye! My 8.5 marking on inside of the fronts was only visible when the wheels came off and a bit of cleaning ensued!
The 245/45's I have now on the front are more precise and steering is more responsive. 275/40's on the back are fine and the rolling radius is pretty damn identical.

 

[Fishinbrine]

I was going to try and draw or explain but found this picture! Basically measured exactly like this

 

[BognorMotors]

Where's @BognorMotors when you need him!

Hello!

So this looks like it’s been covered above , although still slightly oversize, but works perfectly, a 245/45/20 is good for 8.5” wide rim.

We’ve run a 265/40 on 8.5’s for years on 4motions where the rear wheel is wider to match tyre size, with no issues. Just for reference.

 

[doncarlyon]

Hello!

So this looks like it’s been covered above , although still slightly oversize, but works perfectly, a 245/45/20 is good for 8.5” wide rim.

We’ve run a 265/40 on 8.5’s for years on 4motions where the rear wheel is wider to match tyre size, with no issues. Just for reference.

Do you mean 265's all round but with wider wheels on the rear?

 

[BognorMotors]

You have to yes, with a 4motion.

 

[doncarlyon]

You have to yes, with a 4motion.

So the bit of stretch on the rears doesn't impact the 4motion?

 

[CRS Performance]

So the bit of stretch on the rears doesn't impact the 4motion?

I would say that having the same tyre on two different width wheels will impact the overall diameter , I havent measured it because we just dont do it ,
We use a wider rear tyre on the 10 J rear rim and narrower front tyre on the 8.5 J rim , they fit perfectly , no stretching or bulging and definitely the same rolling diameter . absolutely no stress on the centre diff at all .
265 tyres still touch on the front on some offsets and wheel widths .

A 265 tyre is 10.5 inches wide , on a 8.5 inch wheel ?? clearly not dangerous, or illegal, just not right for a good look .

 

[BognorMotors]

So the bit of stretch on the rears doesn't impact the 4motion?

Not at all it works perfectly. We’ve not had a single issue with 4motion and wheels in over 20years of dealing with the transporter.

 

[CRS Performance]

Doncarlyon . The 4 motion system is designed to take into account tyre wear , the difference between a new and worn tyre front to back could be more than the difference a stretch would give , However .
The point is they dont look good , one stretched tyre and one bulging tyre , sadly once you notice it on your van you cant un notice it , It doesn't look good at all ,

 

[Kind of Blue]

Putting two of the same tyres on dissimilar wheel widths must affect overall circumference of the tyre to some extent by geometry, two slopping sidewalls verses two perpendicular side walls. The two perpendicular walls must have more height and greater circumference than the stretched tyre. May get away with dissimilarities such as overly worn tyres on one axle or a one axle stretch but eventually it might overly stress things like Haldex on an AWD 4Motion and the ABS may be affected to some degree or other, even if it does not flash up driving in difficult circumstances such as poor weather may affect the normal Ballance of the vehicle. I do not really understand this desire for stretched tyres anyway it is surely down to an over indulgence to fashion and vanity, some stretches appear dangerous and some report difficulties in inflation and reinflation. Stretched tyres must be more prone to rapid deflation in comparison. Tyre manufactures lay out the range of widths of rim that tyres of certain sizes must be fitted.

If someone driving with stretched tyres that fell outside of tyre manufacturers recommanded wheel width for that diameter and was involved in a very serious accident then they would be culpable and if a garage was fitting them or recommanding them the they might be liable under corporate rules. It does not appear like good practice to me.

 

[doncarlyon]

Doncarlyon . The 4 motion system is designed to take into account tyre wear , the difference between a new and worn tyre front to back could be more than the difference a stretch would give , However .
The point is they dont look good , one stretched tyre and one bulging tyre , sadly once you notice it on your van you cant un notice it , It doesn't look good at all ,

It's not something I would do.

Had a BMW a few years back with staggered rears, but tyres the same all round (spare set of winter wheels) and you're right... once you see it, you can't see anything else.