[donny95]

Currently shopping for tires
Set on either;
245 40 19/ 275 35 19
OR
235 35 19/ 265 30 19

I like the meatier option but I don't want to pick option 2 if it will hinder off the line performance as I still want to be able to launch and get the same result as I did with the stock 225 255 setup

So will option 2 hinder it noticeably more than option 1 or is the difference so small that it it is doesn't make a difference

[Billfitz]

Wider tires may or may not be better off the line. Wider gives more friction, but there comes a point where more friction is too much drag and the wider tire has too much weight. More friction also increases road noise and hurts fuel economy, so you can go too wide. I'd be inclined to not go more than 10mm wider than stock. Also, you have the aspect ratios backwards. 235/35 is a nominal 25.5" diameter, 245/40 is 26.7. You've got to be sure that you get the right diameter.

[alohasurftoad]

Originally Posted by donny95

Currently shopping for tires Set on either; 245 40 19/ 275 35 19 OR 235 35 19/ 265 30 19 I like the meatier option but I don't want to pick option 2 if it will hinder off the line performance as I still want to be able to launch and get the same result as I did with the stock 225 255 setup So will option 2 hinder it noticeably more than option 1 or is the difference so small that it it is doesn't make a difference

width(rolling resistance), along with weight, diameter(gearing) and compound will affect your acceleration.

if same compound, obviously 275/35/19(26.6") will have the most grip due to taller gearing, weight and rolling resistance, especially compared to the much shorter 265/30/19 which is 25.3"(0.7" less than OEM diameter). 265/30/19 also increases speedo error and accrues more mileage by a small percent, increases fenderwell gap and has worse ride and impact protection.

imo 235/40/19(26.4") and 265/35/19(26.3") in a race, extreme, or max performance summer compound is the best balance of all these variables for a 19" staggered setup. IF you have a 10" width rear wheel, 245/35/19-285/30/19 is another option to consider.

[donny95]

Originally Posted by alohasurftoad

width(rolling resistance), along with weight, diameter(gearing) and compound will affect your acceleration.

if same compound, obviously 275/35/19(26.6") will have the most grip due to taller gearing, weight and rolling resistance, especially compared to the much shorter 265/30/19 which is 25.3"(0.7" less than OEM diameter). 265/30/19 also increases speedo error and accrues more mileage by a small percent, increases fenderwell gap and has worse ride and impact protection.

imo 235/40/19(26.4") and 265/35/19(26.3") in a race, extreme, or max performance summer compound is the best balance of all these variables for a 19" staggered setup. IF you have a 10" width rear wheel, 245/35/19-285/30/19 is another option to consider.

I have a 9.5 rear wheel, so you would still say to go with the 235 265?

[alohasurftoad]

Originally Posted by donny95

I have a 9.5 rear wheel, so you would still say to go with the 235 265?

265/35 fits perfect on 9.5" and 235/40 on 8.5"

[Icarium81]

What I'd like to know is how often you're taking your car to the dragstrip or track that you think you would in any way whatsoever EVER notice something so negligible in difference...

[donny95]

Originally Posted by Icarium81

What I'd like to know is how often you're taking your car to the dragstrip or track that you think you would in any way whatsoever EVER notice something so negligible in difference...

Just racing off launch with friends here and there

[BMWILUVU]

Originally Posted by donny95

Currently shopping for tires
Set on either;
245 40 19/ 275 35 19
OR
235 35 19/ 265 30 19

I like the meatier option but I don't want to pick option 2 if it will hinder off the line performance as I still want to be able to launch and get the same result as I did with the stock 225 255 setup

So will option 2 hinder it noticeably more than option 1 or is the difference so small that it it is doesn't make a difference

Billfitz is right the wider the tire the larger the contact area but your weight is distributed across it so there is a trade-off. There is some experimenting to get it optimized but most of us don't have that luxury so for track especially I went with the tried and true 245/265 from the M2 which is similar enough to the 340i. Seems balanced and serves me well on track as the wider front reduces understeer abit and grips on the curves and the 265 rears grip well on the straights.

[Wires]

Originally Posted by donny95

Just racing off launch with friends here and there

In that case, just do wider. They look "sexier" and will give you better traction.

Wider does typically increase mass, which effects the "unsprung weight" (harder to spin them up faster), but that most likely is balanced out with the lack of wheel spin and throttle cuts due to that.

[donny95]

Originally Posted by Wires

In that case, just do wider. They look "sexier" and will give you better traction.

Wider does typically increase mass, which effects the "unsprung weight" (harder to spin them up faster), but that most likely is balanced out with the lack of wheel spin and throttle cuts due to that.

between 245/275 and 235/265 I just want the one that will give the best performance

If the wider set can give better performance without slowing me down then I'll go for those

Others I don't really mind the 235/265 setup either

[Elvisfan]

Originally Posted by donny95

Just racing off launch with friends here and there

I hope you aren’t street racing. A guy in Florida just got 20 years for killing 2 people, including a baby while street racing.

[Icarium81]

You will literally never notice the difference if all you're doing is some rare hard pulls on random streets with friends.

[donny95]

Originally Posted by Elvisfan

I hope you aren’t street racing. A guy in Florida just got 20 years for killing 2 people, including a baby while street racing.

No not even close to what you're imagining

Just a pull 0-60 in empty areas and pushing back roads areas but nothing like need for speed on regular streets no way

[Elvisfan]

Originally Posted by donny95

No not even close to what you're imagining

Just a pull 0-60 in empty areas and pushing back roads areas but nothing like need for speed on regular streets no way

Great to hear.