[AMK2400]

I have a 09-335i Convertible original tires 225/35R19 front and 255/30R19 run-flats rear just bought the BMW awful ride I like change tires to 225/40R19 and 255/35R19 has anyone tried this will it work I am sure this has been discussed here already I have a hard time finding the old discussions so please help. Thank you

[Vivek.]

Rear will be fine I am currently running 235/35 and 255/35 on 19's and I have run 245/35 and 265/35 in the past.

245/35/19 rubbed a little in the front on a bolt for the aux radiator in the driver's wheel well which is 335is-specific. Calculator says 225/40 is 0.3" taller than 245/35, so that MAY cause an issue.

[AMK2400]

Thanks for the Help
I just don't know if 225/40R19 will work in the front
I know the back tires 255/35R19 will work

[Vivek.]

You could always do 235/35 or 245/35 as an in-between, as an added bonus it'll reduce understeer. I am assuming you are on stock suspension btw.

[tcphoto]

I have an '09 335 with 235/40/18 and 265/35/18 PS4S and have no issues.

[Bimmer_Engineer]

Originally Posted by AMK2400

I have a 09-335i Convertible original tires 225/35R19 front and 255/30R19 run-flats rear just bought the BMW awful ride I like change tires to 225/40R19 and 255/35R19 has anyone tried this will it work I am sure this has been discussed here already I have a hard time finding the old discussions so please help. Thank you

Have you considered sticking with the stock size and just ditching the run flats?

[Vivek.]

Originally Posted by tcphoto

I have an '09 335 with 235/40/18 and 265/35/18 PS4S and have no issues.

OP is on 19's, though

Originally Posted by Bimmer_Engineer

Have you considered sticking with the stock size and just ditching the run flats?

This is a good point, I'd assumed he wanted a sidewall increase in addition to ditching the runflats.

Definitely ditch the runflats in favor of a can of fix-a-flat and/or a AAA membership.

[lookalikehuuh]

Originally Posted by Vivek.

OP is on 19's, though

This is a good point, I'd assumed he wanted a sidewall increase in addition to ditching the runflats.

Definitely ditch the runflats in favor of a can of fix-a-flat and/or a AAA membership.

Agreed a good riding non flat tire is better here.

Michelin Pilot Sport 4S ride great and are quiet, plus grip like hell, they last pretty long too. Only downside is the price.

[AMK2400]

I have considered original size no run flats but I was wondering if anyone has tried going up in size with no run flats would that give it a better ride

[Bimmer_Engineer]

Originally Posted by AMK2400

I have considered original size no run flats but I was wondering if anyone has tried going up in size with no run flats would that give it a better ride

Going to a higher section sidewall with the same tread width should give a better ride...it will also make your Speedo and odometer wrong.

[AMK2400]

I know the ride now is awful god forbid if you hit a pothole

[AMK2400]

Thanks for the Help
225/40R19 will work in the front
255/35R19 will work in the rear
I just replaced the run flats with General G-max AS-05 so so much better and they fit perfectly

[TunafishE93]

Those are the exact sizes i went to. The speedo is more correct now since BMW puts a 3mph difference at 70. The odometer might be a little off be lower milage! The ride is better and you have more tire contact on the road, which translate to better grip. The 225/40/19 and 255/35/19 has a bigger foot print then the 235/35/19 and 265/30/19 btw.

[King Rudi]

Originally Posted by tcphoto

I have an '09 335 with 235/40/18 and 265/35/18 PS4S and have no issues.

I hate to be that guy that always derails a thread, but your paint is immaculate!

[tcphoto]

I appreciate the comment but it is far from immaculate these days. Coincidentally, I have a polisher kit arriving from Chemical Guys soon and will be getting serious about detailing it.