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Discussion Starter #1
Hello fella,


My 1st post, English is not me strength. Anyhow, for others benefit, I have tested and try to retrofit 245/60r18 on the 2015 Sienna AWD. It does NOT work due to minor rubbing when turning.


I was trying to replace my OEM Run Flat Tire [RFT] (32,000KM 5/32" thread left ) ~20K Miles. the OEM RFT is super heavy.. IMHO- RFT sucks.
 

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Thanks for the post! This upsizing tires question gets complicated quick!

If you could give a few more details about the setup you tried it would be appreciated.
What was the tire you tried? Although 245 is the section width, it is my understanding that does not dictate the tread width even though both are 245.
What was the wheel you tried it on?
Do you know the wheels offset?
I'm guessing you're on the OEM 18" wheel with a 35 mm offset. Although it is possible it is out there as OEM 35 mm or 38 mm.

Rumor has it that Michelin LTX MS 245/65R17 will fit on OEM 17" wheels. I'm running 235/60R18 on OEM 2014 AWD limited wheels.

I'm curious about the math so I'll run a few rough numbers.

I'll call the 235/60R17 35 mm offset Michelin Primacy MXV4. I believe tire wheel combo stock on FWD LE models and use it as a reference point.
https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Primacy+MXV4&partnum=36TR7MXV4P
diameter 714 mm
Thread width: 7.7"
Section width: 235 mm
Offset: 35 mm

AWD models OEM
235/55R18 35 mm offset
diameter 716 mm
Thread width: unknown
Section width: 235 mm
Offset: 35 mm
Radius increase: 1 mm
Sidewall clearance decrease: 0 mm

235/60R18 35 offset Blizzak DM-v2 (my winter setup)
https://www.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Blizzak+DM-V2&partnum=36SR8DMV2XL&vehicleSearch=false&fromCompare1=yes
diameter 739 mm
Thread width: 7.4"
Section width: 235 mm
Offset: 35 mm
Radius increase: 13 mm
Suspension clearance decrease from side wall: 0 mm
Treadwidth increase: 0.15" decrease

The 245/65R17 35 mm offset Michelin Defender LTX MS - Rumored to work
https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Defender+LTX+M%2FS&partnum=46HR8DLTX&vehicleSearch=false&fromCompare1=yes
http://www.siennachat.com/forum/40-general-discussion/20131-will-these-wheels-fit-michelin-ltx-ms-245-65-r17.html
diameter 750 mm
Thread width: 7.8"
Section width: 245 mm
Offset: 35 mm
Radius increase: 18 mm
Suspension clearance decrease from side wall: 5 mm
Treadwidth increase: 0.05" or 1.27 mm

245/60R18 35 mm offset
diameter 751 mm
Thread width: unknown
Section width: 245 mm
Offset: 35 mm
Radius increase: 19 mm
Sidewall clearance decrease: 5 mm
Treadwidth increase: unknown

Assuming 245/65R17 Michelin LTX MS tires do work on OEM wheels. The radius increase of 1 mm is minimal. I'd have to assume either the tires you selected have a wide tread or you have wheels with a different offset. Or you just reached the point when upsizing tires they stop fitting. After this research I'm very curious the tire you tried?
 

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Discussion Starter #3
Hello SC,

The wheel set i tried was used, it's came from a 2014 Ford Edge (5x114.3- 18x8.0 ET40). Tires was Michelin LTX at 5/32 thread remaining.

the overall high was 5% taller compare to 235/55r18. When i said about minor rub, I meant the tire rub the back of the plastic wheel well. it's only happen when you do a sharp turn. with only 50% thread remain the tire rub, therefore I would assumed the rubbing is worst if a new 245/60R18 tires was used.

hope it answer your question.

PS: i recalled reading a general rule of thumb. Don't go over 3% taller than OEM tire height.
 

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Thanks for followup good info for people out there.

I'm assuming the ET40 is a 40mm offset. That probably did you in. I'm not surprised a 40 mm offset wheel with an upsized tire didn't work.

Let me just say the tire shops are terrible about this. In general people can't seem to understand the second number in tire sizing is the sidewall ratio and not the sidewall height. I think they give up on trying to explain wheels. You could try again with that tire and a 35 or less offset wheel. I just put brand new 245/65R17 Michelin LTX MS tires on OEM 17" 35 mm offset wheels and they fit fine; no rubbing. It is a sort of a tight fit though.

The setup you tried
245/60R18 40 mm offset
diameter 751 mm
Thread width: unknown
Section width: 245 mm
Offset: 40 mm
Radius increase: 19 mm
Sidewall clearance decrease: 10 mm
Treadwidth increase: unknown
 
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