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SaltyNC · 05-04-2016, 11:24 PM

For those of you running 19x10 ET 25 on the rears with 265/30 Michelin PSS tires, do you think I could get away with running 19x10 ET 20 with 265/30 PSS. Five more millimeters to the outside edge than your current setup?

I tried my best to get accurate measurements, but it is tough measuring a curved fender well. I measured from the INSIDE of the fender to the WIDEST part of the sidewall, and I've got basically no extra space, but of course on the Contis I have, the sidewall is curved, so there is more room near the outside edge of the tire. Maybe I would have 7mm or so of extra space allowing for the smaller tread width to sidewall. I get about 12mm extra space to the OUTSIDE edge of the fender to the widest part of the sidewall. Sound about right to you guys?

265/30/19 PSS Tire to Stock
19x10 ET 20 +15MM Possible Rubbing on lowered car
19x10 ET 25 +10MM Best Fitment. No rubbing on lowered car.
19x9.5 ET 22 +13MM Possible slight rubbing with aggressive driving on lowered car. Maybe would clear barely?

275/30/19 PSS Tire to Stock
19x10 ET 20 +20MM Beyond Outer Fender
19x10 ET 25 +15MM Possible Rubbing on lowered car.
19x9.5 ET 22 +18MM Beyond Outer Fender.

Does this sound right?

The rear wheel I'm considering comes in 19x9.5 ET 22 or 19x10 ET 20. I'd rather have the 10" wheel if I can get away with it with a 265 tire. I don't want to go lower width than a 265 on a 10" tire.

I found this old post from dubsesd where he was running 19x9.5 ET 23 with 275 tires, and it's lowered, but I don't know what brand of tire he was running back then or if he used negative camber to achieve it.
http://www.zpost.com/forums/showthread.php?t=636922

Using this calculator shows that a 19x9.5 ET 23 wheel on 275/30 tire that fit for Dubsesd's car is actually wider than a 19x10 ET 20 wheel on a 265/30 tire. So, I'm hopeful.

Man, this wheel and tire fitment is a chore. I feel like I'm back in school, and that's been a long time. I have searched and searched and studied and used tire and wheel calcs, etc.

I imagine ya'll are probably sick of tire/wheel questions. Sorry. :-( I'm late to the party, I know.

Thanks for any help.

Salty

05-04-2016, 11:24 PM	#4
SaltyNC Captain 370 Rep 870 Posts Drives: 2006 BMW Z4M Roadster Join Date: Oct 2015 Location: NC iTrader: (2) Garage List 2006 BMW Z4M Roadst ... [0.00]	For those of you running 19x10 ET 25 on the rears with 265/30 Michelin PSS tires, do you think I could get away with running 19x10 ET 20 with 265/30 PSS. Five more millimeters to the outside edge than your current setup? I tried my best to get accurate measurements, but it is tough measuring a curved fender well. I measured from the INSIDE of the fender to the WIDEST part of the sidewall, and I've got basically no extra space, but of course on the Contis I have, the sidewall is curved, so there is more room near the outside edge of the tire. Maybe I would have 7mm or so of extra space allowing for the smaller tread width to sidewall. I get about 12mm extra space to the OUTSIDE edge of the fender to the widest part of the sidewall. Sound about right to you guys? 265/30/19 PSS Tire to Stock 19x10 ET 20 +15MM Possible Rubbing on lowered car 19x10 ET 25 +10MM Best Fitment. No rubbing on lowered car. 19x9.5 ET 22 +13MM Possible slight rubbing with aggressive driving on lowered car. Maybe would clear barely? 275/30/19 PSS Tire to Stock 19x10 ET 20 +20MM Beyond Outer Fender 19x10 ET 25 +15MM Possible Rubbing on lowered car. 19x9.5 ET 22 +18MM Beyond Outer Fender. Does this sound right? The rear wheel I'm considering comes in 19x9.5 ET 22 or 19x10 ET 20. I'd rather have the 10" wheel if I can get away with it with a 265 tire. I don't want to go lower width than a 265 on a 10" tire. I found this old post from dubsesd where he was running 19x9.5 ET 23 with 275 tires, and it's lowered, but I don't know what brand of tire he was running back then or if he used negative camber to achieve it. http://www.zpost.com/forums/showthread.php?t=636922 Using this calculator shows that a 19x9.5 ET 23 wheel on 275/30 tire that fit for Dubsesd's car is actually wider than a 19x10 ET 20 wheel on a 265/30 tire. So, I'm hopeful. Man, this wheel and tire fitment is a chore. I feel like I'm back in school, and that's been a long time. I have searched and searched and studied and used tire and wheel calcs, etc. I imagine ya'll are probably sick of tire/wheel questions. Sorry. :-( I'm late to the party, I know. Thanks for any help. Salty __________________ 2006 BMW Z4M Interlagos Blue/Black Aux Port\|LED Interior\|LED Strip Trunk\|Underseat First Aid Box\|Stubby Antenna\|Intravee II\|BMW Oil Change Kit\|Top Down Side Panels\|Vibra Technics Engine Mounts\|Rogue Trans Mounts\|Engine Mount Bolts Upgrade\|RS Windblocker\|Euro Front Plate\|M5 Illum Shift Knob\|Supersprint Powerloop Exhaust\|Gruppe-M Intake\|RPI Scoop\|Black Grills\|19x8.5 ET35 F 19x9.5 ET22 R Sportline 8s PSS\| Besian Vanos\|CDV Delete Last edited by SaltyNC; 05-05-2016 at 11:05 AM..
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