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Old 7th January 2017, 07:07 PM   #1 (permalink)
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Unhappy front tire size

i am coming off a square set up and fitting 305/30/20 rears.
but there seems to be some confusion over what size the fronts tires should be.
please help if you can.
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Old 7th January 2017, 07:21 PM   #2 (permalink)
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just checked mine mpss 305/30/20 rears 275/35/20 fronts
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Old 7th January 2017, 07:24 PM   #3 (permalink)
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Originally Posted by terry lloyd View Post
just checked mine mpss 305/30/20 rears 275/35/20 fronts
TOP MAN thanks for that.
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Old 7th January 2017, 08:35 PM   #4 (permalink)
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just checked mine mpss 305/30/20 rears 275/35/20 fronts
What he said^^
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Old 8th January 2017, 05:08 PM   #5 (permalink)
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The 888 set is 285/35/20 and 305/30/20, perfect match for the 285 front is 335/30/20 that is identical tyre height but loads run the first combo with no bother as Toyo dont do a 335
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Old 9th January 2017, 12:37 PM   #6 (permalink)
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The 888 set is 285/35/20 and 305/30/20, perfect match for the 285 front is 335/30/20 that is identical tyre height but loads run the first combo with no bother as Toyo dont do a 335
Exactly right, please do check your sizes on a calculator as there are a lot of setups that will end up overworking the ETS unit and cause transmission problems. Stock is around 0.6-0.7% difference, anything over 1% will start being a little 'active' (you'll see the torque split flicking to AWD on the MFD on part throttle)
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Old 9th January 2017, 12:48 PM   #7 (permalink)
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Exactly right, please do check your sizes on a calculator as there are a lot of setups that will end up overworking the ETS unit and cause transmission problems. Stock is around 0.6-0.7% difference, anything over 1% will start being a little 'active' (you'll see the torque split flicking to AWD on the MFD on part throttle)
Good to see a shop getting involved whats your thoughts on the 305 rears and 275 front set ups
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Old 9th January 2017, 12:54 PM   #8 (permalink)
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Good to see a shop getting involved whats your thoughts on the 305 rears and 275 front set ups
that puts them at 1.4% difference........ can't be good right?
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Old 9th January 2017, 12:56 PM   #9 (permalink)
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that puts them at 1.4% difference........ can't be good right?
Hmmmm thought it was over the 1% thought that was the known size to go for
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Old 9th January 2017, 01:00 PM   #10 (permalink)
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315 would go lovely
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Old 9th January 2017, 01:05 PM   #11 (permalink)
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To be clear, 'over 1%' will not immediately break it, but it will be a little more active than originally designed. We also see a difference on the model years of cars with the different software versions too.
Best advice is to stick to the minimum tyre size difference you can, if you've non standard tyre sizes, keep an eye on the AWD torque split and check it isn't surging while driving or being overly active on sweeping corners.
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Old 9th January 2017, 01:09 PM   #12 (permalink)
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315 would go lovely
Yep, the 275/35 and 315/30 is good (0.5%), 285/35 and 335/30 is also good (but rather wide, I wouldn't confirm this would clear and defo not on a stock wheel)

Certain model years and software version are a little easier on the differences for sure, just be aware on the torque split when you initially fit non oem sizes.
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Last edited by ACspeedtech; 9th January 2017 at 01:27 PM..
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Old 9th January 2017, 07:19 PM   #13 (permalink)
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Am I right in saying a 265-35 x 305-30 combo would be even closer than standard?
If so I'd sacrifice 10mm on the front for a happier ets unit.

I just checked the new 4s tyre sizes and the 265-35 has a noticeably less load rating.
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Old 9th January 2017, 08:20 PM   #14 (permalink)
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On the MPSS if i remember correctly they either did not do 265 or they did not do them in XL
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Old 9th January 2017, 09:37 PM   #15 (permalink)
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Michelin Pilot Sport 4 S Press Release - Tyre Reviews
Maybe they do now?
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Old 9th January 2017, 10:06 PM   #16 (permalink)
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Originally Posted by terry lloyd View Post
On the MPSS if i remember correctly they either did not do 265 or they did not do them in XL
Yes thats correct, they do them in the cup2 xl size though, 265 & 305.
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Old 10th January 2017, 07:46 AM   #17 (permalink)
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Am I right in saying a 265-35 x 305-30 combo would be even closer than standard?
If so I'd sacrifice 10mm on the front for a happier ets unit.

I just checked the new 4s tyre sizes and the 265-35 has a noticeably less load rating.
Yes, those are a very good size combo, I've heard rumours they are bringing a higher load rated 4s out, I think they'll be getting pestered at the Autosport show on Thursday about that.
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Old 10th January 2017, 12:19 PM   #18 (permalink)
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305/30/20 is 27.2" tall, 265/35/20 is 27.3" tall
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Old 10th January 2017, 05:55 PM   #19 (permalink)
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335 rear does clear and still leaves big black lines



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Old 10th January 2017, 06:24 PM   #20 (permalink)
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Cheers John! 335s on stock wheel with no spacers? Just to confirm for other interested chaps.
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