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[MichaelATL]

Hey all, I have a 335 and I have 8x18 front and 8.5x18 in the back.

I want to go to 9x19 front and 9.5x19 rear (maybe 10)

what would be a good reason not to get 19s besides rougher ride... and why would wider be worse? (weather aside?) any issues I should consider??

Thanks,
Michael

[rmorin49]

Your ride will probably be rougher and acceleration slower but many like the looks of a larger and wider tire especially in the rear.

[txusa03]

bigger tires and rims means more weight. bigger tires also cost more when time to replace them.

[MichaelATL]

why slower acceleration? wouldnt wider tires give you more traction?

(a marginal cost increase is no big deal)

[ksfrogman]

Wider and larger tires increase the contact patch with the road, which increases friction and roadhoading, and could decrease gas mileage nominally. Wider front tires may increase your front's tendency to track steer annoyingly with the grooves in the road.


You likely will not be able to fit aggressive RFTs with the 19s, which could be seen as a disadvantage or not.

[MichaelATL]

well ok... say i go 19x9 front, 19x9.5 in the rear... they may weight more, ok, and i might hydroplane more.. ok and i will have to pay more... ok , but...

wont i have more traction (better handling and better acceleration) especially acceleration considering in my 335 my 8.5inchers dont grip well enough on launch...

[sstarch1]

Not acceleration, you have more mass around the circumference of the rim (4X more). Takes more torque to get that mass to rotate.

Lightweight (forged?) rims would make a difference, maybe even improve acceleration.

IMO, the weight factor would be considerable more than the contct path friction.

[MichaelATL]

but if i wanted to eliminate wheel spin, then a slightly heavier wheel (due to width) may not matter... right? anyways thanks for all your patients... i am a total newbie to this stuff...

[Herc]

Originally Posted by sstarch1

Not acceleration, you have more mass around the circumference of the rim (4X more). Takes more torque to get that mass to rotate.

Lightweight (forged?) rims would make a difference, maybe even improve acceleration.

IMO, the weight factor would be considerable more than the contct path friction.

(Quick threadjack) Hey sstarch1, went to your garage, but no pics?!

Post some up!

H

[txusa03]

If your current stock tire setup does not give you grip, you could simply get new rubber. Many folks have complain about their rft.

[MichaelATL]

i dont want to get really soft tires.... plus wider tires can look really aggressive (yet not tacky if just wide enough)

[gary328xi]

Plus sizing looks good and for the most part gives you better handling. The most important thing to consider is the offsets of the new wheels. Going with a too aggressive offset in the rear could create understeer.

I upgraded my wheel to the 18 inch mesh style. I have 18x8.5 front with 40 et and 18x9.5 with 45 et. Tires Michelin ps2 and M mobility kit. The ride is nothing less than gorgeous.

[Snowman811]

FWIW, I went from 18" stock, heavy RFT to 19" lighter non-RFT setup and it "feels" better. The ride is a bit nicer with a real tire, vs. RFT. My butt dyno can't tell any appreciable difference on acceleration. Cornering is MUCH better, night and day using a quality tire.

[MichaelATL]

I like the RFT though... i got a flat and it didnt go flat....
if i go wider 19" then I'll get RFT again... oh well... my 162 18s are ok for now...

[hemi to e90]

the grip thing isnt gonna be something that another .5-1" wider tire is gonna help. what will help ya is a real tire (non-rft) that is extremely grippy, but if u wanna start play at a dragstrip or play with a g-tech, watch ur tire pressure. the wider wheel/tire in the back is more to help u look "cooler" IMHO. and 9" in the front with 10" in the back looks good yes, but the preformance advantage wont be huge, and especially in normal street driving. take it on a track and its completely different story.

moral of the story, get what u think works for u and get a great max performance tire. Im running vredestien Ultracs, before that i had all-seasons. night and day difference, and it really came down to the tire.

now go out and burn down that RFT rubber

[MichaelATL]

lol thanks hemi..

i think i'm going to get 19x9, 19x9.5R for my E90... but i was just worried about any adverse side effects...

i want to keep the RFT b/c i dont want a spare.. idont want to be stranded!!!

so i think the bigger tires will made the car even more stable and it should grip a touch better which will help in the future if i further boost the turbos, which i might in a year or 2

[Vinobien]

sounds like you had your mind made up when you made your initial post. But anyway - 9 inch fronts IMO are too big. Go 8s or 8.5s with 235s or 245s. 9.5s or 10s are ok for the back wth 265s or 275s. Don't do the RFTs. Too harsh a ride and expensive. Do get a trunk repair kit and AAA.

[MichaelATL]

i want to get style 199 but they are $5000 plus...

( my 162s are fine... i cant justify the 3000 differential in price (considering trade in value)

[ICALL]

Originally Posted by Vinobien

Do get a trunk repair kit and AAA.

Does AAA = BMW Roadside Assist? The new 335i's come with Roadside assist but I read on another thread they are just outsourced and don't really know anything about/not affiliate with BMW. Remember one poster mentioned sending two drivers away. Is AAA any better or same thing?

[dawgdog]

Originally Posted by sstarch1

Not acceleration, you have more mass around the circumference of the rim (4X more). Takes more torque to get that mass to rotate.

Lightweight (forged?) rims would make a difference, maybe even improve acceleration.

IMO, the weight factor would be considerable more than the contct path friction.

My RS-GTs 19" with 275/30 PS2s rear and 245?35 PS2s in the front are considerably lighter than the 161 oem 18" wheels with the runflats. Those runflats tires weigh a ton. I bet there was a difference of 15# per wheel/tire combo.