Will wider wheels but less weighted affects acceleration

[650GC]

Will wider wheels but less weigh than OEM affects acceleration.

I recently changed from the following factory rims and tires to after market wheels.

Stock Bmw 373 style: runflats
Front 20x8.5 with 245/35/20 total weight 33+31=64LB
Rear 20x9 with 275/30/20 total weight 33+34=67LB

Switched to Rohana RF2: non-runflats
Front 20x9 with 255/35/20 Michelin PSS total weight 24+25=49LB
Rear 20x11 with 295/30/20 Michelin PSS total weight 25+29=54LB

I feel the car accelerate slower than before but was expecting faster acceleration from 0 to 60.

Anyone experienced this, or I just feel I'm slower due to more traction and comfort compare to factory setup.

According to my research, I should feel the difference and car should accelerate faster.

I haven't race anyone so I wouldn't know if it just feels slower due to more comfort or it did really get slower than before.

[Havy]

I would say it is your pure subjective feeling. We are talking about 1/10 of seconds. A bigger difference you feel at a race circuit with lap times as you could brake later and hit the throttle earlier.

[DerBosewicht]

Theoretically yes... in reality the difference is so minuscule you would really only notice it with more weight removed. So you removed roughly 30lbs off front axle and 26lbs off rear axle. Let say you were two add two piece floating rotors up front and rear ( usually about 10lb Saving per rotor). That would boost you to about 50lbs less in the front and 46lbs of unsprung weight. This might save you .01-.03 off some track times. You might notice it’s a bit quicker off the line... but probably in our heads. That’s was my impression when I added the two piece toros to a different car I had.

[650GC]

Originally Posted by DerBosewicht

Theoretically yes... in reality the difference is so minuscule you would really only notice it with more weight removed. So you removed roughly 30lbs off front axle and 26lbs off rear axle. Let say you were two add two piece floating rotors up front and rear ( usually about 10lb Saving per rotor). That would boost you to about 50lbs less in the front and 46lbs of unsprung weight. This might save you .01-.03 off some track times. You might notice it’s a bit quicker off the line... but probably in our heads. That’s was my impression when I added the two piece toros to a different car I had.

Thank you. I will take my car on the track next year. Let’s see the difference if any. I will post results with both wheels.

[brad850csi]

Also note that you've increased your tyre diameter from 26.50" to 26.97" (assuming both sets of tyres are new, you're at about 26.2" on your original tyres if they were at 4mm tread)

This means the new tyre is 2% to 3% more in diameter which means a reduction in torque to the wheels by that much.

In addition if you are at 2000rpm with your old tyres you'll now be at 1940rpm which means you'll be slightly down on torque from the engine before you even get to the tires