ISF5L

Hi all,

Few days ago 1 of my rear tyres died on the motorway, thankfully the rim was saved so i ended up getting 2 new rear tyres for my 9.5 inch rim (19inch). 285/30 size and whilst it fits, ive had to shave the guards to minimise the scrubbing and may even have to machine the wheels for a few more mm.

Im aware of the tyre calculator and getting a tyre closest to the OEM diameter (26 inch). So based on that the logical move is to go from my current OEM 225/40 to 255/35 with my 8.5inch rim (19 inch) with 15 offset

Just my personal opinion but i feel 285 is a little wide, i might have gone 275/30 next time even though its not as close as 285/30 as the optimal size. I know with 255 ill most likely have to shave the guards, maybe machine the wheels as per my rears

So my question is, if i decided to go 235 or 245, does it matter that the OEM width difference was 225 / 255 (30mm). With 235 & 285 the difference would be 50mm wider for the rear. Do i need to keep the width difference the same as the OEM setup which was 30mm?

Even now, until i get new fronts, would the handling be that far out given im running 225 front and 285 rear (big difference). To me it feels ok but havent had a chance to push the car yet and wont until i get my water pump issue fixed

Gymkata

Do you have an aggressive offset on your front 19x9 wheels? 255/30R19 should fit without issues in the front with a proper offset unless you are extremely lowered.

JDMV8

iTrader: (6)

I have 265/30/19 in front on a 9.5" wheel, 38mm offset, and I'm lowered. Besides rubbing the plastic fender liner on high speed banked turns, it's A OK.

ISF5L

Sorry guys, got my sizes wrong. Just realised my front rims are 19inch, 8.5inch wide with 15 offset. Doubtful 255 would fit on those. Currently on OEM sizes 225/40. Assuming 245 might be pushing it and 235 should be ok.

If thats the case, do you think the handling would suffer in any way given the rears are now 285 and potential front size will be 235 (50mm variance) whereas the OEM setup was 225 and 255 (only 30mm difference)

Forgot to mention, im not lowered, stock height

isfvss

245/35 should fit I just put Bridgestone Potenza re003 on and they are very good, read a few reviews on them. No rubbing not even close,( standard rims) a good tyre shop will let you down size if they rub with your offset cheers.

5ltrv8

Glad to hear you like the RE003... just ordered the Firestone Indy500 which is the US version of that tire. Can’t wait to get them installed Thursday. Went with 255/35 front and 285/30/19 rears

UCrazyKid

Your problem is offset. Whoever sold you those wheels set you up with an extremely aggressive offset that will limit your tire sizes unless you were to run extremely negative camber. You should be talking to the people who sold you the wheels about an exchange, not about machining the wheels (reduced strength, dangerous).

tas02

iTrader: (2)

Do tell us more about having someone "machine the wheels". As in the reverse of installing wheel spacers.

You have any previous experience with machining wheels for additional offset?

ISF5L

Didnt end up maching the wheels as shaving the guards turned out ok for me. Scrub is minimal now

Gymkata

I had never thought about that concept before...machining a few extra mm off the hub to increase offset. Who here has knowledge about this? I imagine it would depend on each particular wheel whether or not it would be safe to machine or not. I imagine if a wheel was specifically designed for the given offset then machining it might weaken the hub section making it prone to break. If on the other hand the same cast was used for multiple different offsets then there might be extra metal there for the wheels with more aggressive offsets that could safely be machined down??? I would love somebody with experience to chime in. Thanks in advance.

Weapon F

Agree 100% you, that offset is way aggressive for ISF unless your into stance seen and want to drive around at 40mph.

ISF5L

Problem is, if i run OEM sizes, its not an issue. When i had the MPSP tyres OEM it was great, would never had noticed, its now only when ive gone up sizes ive become aware of all this.

Even before purchasing i was asking around what would fit my type of rim etc but i dont even recall offset coming up in the conversation.

Ah well you live and learn. Unfortunately when i got the wheels i knew very little about offset so it wasnt a consideration for me at the time. Obviously im on a steep learning curve now about it. Ive had the wheels for almost 2 years now so id imagine going back to the store now would provide little results. If i get new wheels, it will be the first question i ask lol.

Ps Definitely enjoy driving a little faster than 40mph lol. I dont track it but enjoy a spirited drive here and there :-)