[mikenazz]

So I upgraded my rear tyres to some federal rsrr 275/19/35 . For normal driving they are fine no rubbing, but if i have passengers and go over uneven road it rubs.

Need some guidance on the correct work to be done to stop the rubbing.
located in Sydney

[vtl]

You'll need to do a fender roll

[DR-JEKL]

As you're probably aware you have the incorrect size rear tyre size, a 35 series 275 section tyre is like 27mm larger in diameter than a correct size 275/30....

call nelson at sydney guard rolling.

By memory he was $160 to do my rear guards

[mikenazz]

yeah, my speedo will probably be a bit out due to the incorrect size... Its a sacrifice i took for traction, especially for my cars power goals with hexon r700 in the future.

I will call Nelson for fender rolling thanks guys!


update: Nelsons booked in for Wednesday

[DR-JEKL]

Originally Posted by mikenazz

yeah, my speedo will probably be a bit out due to the incorrect size... Its a sacrifice i took for traction, especially for my cars power goals with hexon r700 in the future.

I will call Nelson for fender rolling thanks guys!


update: Nelsons booked in for Wednesday

Check speedo accuracy with a GPS perhaps?

M3 spec tyres definately will help for traction and handling I had no hope of fitting M3 spec tyres on M3 spec rims though (the pics dont do it justice but you were lucky to fit a sheet of paper between the guards!)



FYI he will cut your guard liner, I'm guessing he had to do this to get the roller in... I was a tad dissapointed my liner had been hacked with a stanley knife albeit my car was at advan getting the M3 driveline installed and I wasn't present when he done the rolling.

[tawfeeqh]

Originally Posted by mikenazz

yeah, my speedo will probably be a bit out due to the incorrect size... Its a sacrifice i took for traction, especially for my cars power goals with hexon r700 in the future.

I will call Nelson for fender rolling thanks guys!


update: Nelsons booked in for Wednesday

I was thinking of running 35 as well to get a bit more rubber, however may just go down one rim size to 18s from 19s

So Instead of 275/35/19 will go 275/35/18, this way my speedo will stay correct and no fender roll required. I guess visually though 18s might not look as good esspecially for e90

[DR-JEKL]

E90 guards are more forgiving you may get away with it?

[Socket]

You could always just stop carrying passengers in the back. Mine does the same under loading up the back. Squeaked all the way to Echuca and back when I had passengers lol

[tawfeeqh]

Originally Posted by DR-JEKL

E90 guards are more forgiving you may get away with it?

Yes true and esspecialy e90 pre lci you could fit just about anything in there lol.

But the speedo will still be off right? I think the standard speedo error is +3kmh (as in it overstates) what would happen if I ran 35 instead of 30 on my 19s. Any ideas in what direction it would throw things off

[DR-JEKL]

Originally Posted by tawfeeqh

Yes true and esspecialy e90 pre lci you could fit just about anything in there lol.

But the speedo will still be off right? I think the standard speedo error is +3kmh (as in it overstates) what would happen if I ran 35 instead of 30 on my 19s. Any ideas in what direction it would throw things off

Larger circumference, so it should read slower IMO...

The speedo works off the ABS sensor/wheel bearing magnetic strip so larger rolling diameter may not affect our cars as much.

[EB89]

As others have said, need to roll your fenders, I'm running 265 in the rear, with 12mm spacers and max roll, so if you have no spacers a guard roll should fix it up.

[JJH]

Use this wheel/tyre calculator - it will show you your speedo error amongst all the other good info on your before-after sizings.
http://www.wheel-size.com/calc/?whee...=30mm&scl=50mm

[CashedUpBogan]

Can our speedos even be recalibrated?

[vtl]

The speedo will under read compared to stock. Meaning that if you are tavelling 100kph, it might read 99-98 if the tyre is brand new (largest rolling diameter).

Originally Posted by CashedUpBogan

Can our speedos even be recalibrated?

Yep should be possible. Can be coded with nettodat coding via NCSExpert. Would require a bit of trial and error though:

Relavant options in the cluster that correspond to impulses per kilometer:
C08_K_ZAHL_TACHO
C08_K_ZAHL_TACHO_KOMPL

I don't see why you would want to run a taller tyre. Surely any marginal increase in grip will be offset by the bigger tyres which effectively give you a taller gear ratio. Maybe for drags but for a car that has to be driven on roads I don't see the benefit.

Its also illegal:

VIC: Look on page 7
https://www.vicroads.vic.gov.au/~/me...les.ashx?la=en

NSW:
http://www.rms.nsw.gov.au/documents/...si-09-rev4.pdf

Cannot increase the rolling diameter beyond 15mm. Going from a 275/30 to a 275/35 is 27mm greater diameter than stock.

[tawfeeqh]

Yeh thats why I was thinking of either going from my 265/30/19 to either:

275/30/19 or
275/35/18

That way no dramas