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Sorry, fitment and offset question (20x10 20x11)


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#1 yamahammer342

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Posted 13 January 2021 - 09:05 PM

Sorry because I know these are repetitive, but I couldn't find any threads with this exact setup.  Looking at the purchasing the following:

 

Rohana RFX11

 

Front: 20x10 +20

Rear: 20x11 +20

 

Stock suspension.

I'm hoping to be able to swap over my current almost new MP4S (255/40) (285/35)

 

Will this work out ok?  Should I get a spacer for the rear?  I would prefer the wheels stick out as much as possible without rubbing.  

 

Also I would like the option of running 888r in the future.  

 

 

Thanks.


Edited by yamahammer342, 13 January 2021 - 09:29 PM.


#2 AutoXGTR

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Posted 13 January 2021 - 09:59 PM

Using OEM suspension and compared to OEM wheels-

 

Front wheel will poke out 31mm more, tire will stick out 25mm more than OEM tire. Usually to get a flush fitment, a 15mm front spacer can be used so with this rim you will likely be about 16mm more poke on the wheel than flush.

 

Rear wheel will poke out 11mm more, tire will stick out 5mm more than OEM tire. Usually to get a flush fitment, a 20mm front spacer can be used so with this rim you will likely be about 9mm less poke than flush. This can be fine or you can use a 10mm wheel spacer.

 

In your case the wheels are not likely to rub because the suspension is OEM and the tires are OEM, but they may poke out some.

 

Toyo R888R tires in the future should not be a problem unless you choose sizes that are taller than OEM tire diameter.

Front 285/35-20

Rear 325/30-20

 

305/35-20 square (on both front and rear wheels) has a tall tire diameter of 28.4" - slight risk of rubbing under load.


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#3 yamahammer342

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Posted 14 January 2021 - 07:21 AM

Using OEM suspension and compared to OEM wheels-

 

Front wheel will poke out 31mm more, tire will stick out 25mm more than OEM tire. Usually to get a flush fitment, a 15mm front spacer can be used so with this rim you will likely be about 16mm more poke on the wheel than flush.

 

Rear wheel will poke out 11mm more, tire will stick out 5mm more than OEM tire. Usually to get a flush fitment, a 20mm front spacer can be used so with this rim you will likely be about 9mm less poke than flush. This can be fine or you can use a 10mm wheel spacer.

 

In your case the wheels are not likely to rub because the suspension is OEM and the tires are OEM, but they may poke out some.

 

Toyo R888R tires in the future should not be a problem unless you choose sizes that are taller than OEM tire diameter.

Front 285/35-20

Rear 325/30-20

 

305/35-20 square (on both front and rear wheels) has a tall tire diameter of 28.4" - slight risk of rubbing under load.

 

I've seen your replies in this forum before and you are the man. I was a little worried about the front, thank you!



#4 AutoXGTR

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Posted 15 January 2021 - 04:16 PM

For your case, key is tire diameter of the front tire. As long as it is OEM 28" or less then you are fine with rubbing. Wheel offset determines how much poke you get. Aggressive offset is fine and should be OK with handling and performance for normal use and limited track.

 

Best situation is to buy wheels with the offset that doesn't require wheel spacers. If in doubt you can mount the wheels and look at the poke before deciding if you want to add the wheel spacer. If the wheel spacer is thick then you might need to add wheel studs that are longer than OEM. A thin hubcentric wheel spacer like 5mm is fine with OEM studs. If you use multiple wheels with different offsets and don't always need wheel spacers for fitment then open ended nuts will work with any combination of wheel offsets and longer studs. Close end nuts require a tight lock on the wheel so fitment is critical.


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2009 GTR Premium Gun Metallic/ Black Leather #2361

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#5 yamahammer342

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Posted 20 January 2021 - 11:20 AM

Ok replying to this thread because I think I finally made a decision on wheels.  Going with some custom Vossens, so I will have the ability to order whatever offset I want.  Going with 20x10 F and 20x11 R.  So far I'm thinking +30 in the front and +5 in the rear.  Want as flush as possible with no rubbing on stock suspension and also keeping camber conservative ( around -1.5 front).  But In cause I want to in the future run a 285 front tire, will there be room for that?  I know I can run a +25 in the front and be ok with the stock 255.  So im hoping +30 will be ok with a 285.  



#6 AutoXGTR

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Posted 21 January 2021 - 09:45 PM

If you go with

20x10 et30 in front

20x11 et5 in rear then compared to OEM

 

Front wheel will poke out 21 mm more, if you use et35 then it will poke 16mm more so that is the range you want, et 30 for more aggressive poke and et35 for near flush

 

Rear wheel will poke out 26mm more, if you use et10 then it will poke 21mm more so that is the range you want, et 26 for more aggressive poke and et10 for near flush

 

This assumes you want offsets in 5mm increments, many wheel companies can do any offset for custom wheels so any number is possible.

 

Though your offsets are aggressive they are still in the range of being flush but it might depend some on the actual tire you use and how wide it looks and how much negative camber you run.


4472829118_3e56d7a83c_m.jpg4419874927_166d46a46b_m.jpg

2009 GTR Premium Gun Metallic/ Black Leather #2361

#35 Street Modified Class Solo SCCA Hawaii Region 2020-21
2009-2021 Season Points and Runoff Champion(ASP 2009-12/SSP 2013/Street Modified 2014-19/2nd Points SM 2020, 2nd Runoff SM 2016-17)
2009-2014 Season Pax Overall 12th tied 2010/ 13th tied 2011/ 10th 2012/ 10th tied 2013/10th 2014



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