Hey Guys,

Happy new year!

Need everyone to chime in if they can, I need to get my tire and rims sorted out as soon as possible, my set up is:

Rims:
Vorsteiner V106
19x9
19x12

Tires:
Pilot Sport Cup 2's
245/35/zr19
325/30/zr19

I just need to confirm the following:

1- Does my set up slow my acceleration down (Wheel & Tire Size)?

If Yes:

1- Is it the Tire size or the Rim size?

I have a few locals interested in buying my rims, so if it's confirmed that they slow me down I may consider selling them and looking for alternatives and run R888's.

Would you guys recommend 18's or 19's (if the option is there).

Thanks in advance for the input!

 

Man great question I would like to know for myself. I'm thinking of doing the same.

 

Hi Tareq your question considers a few variables.

You have a slightly larger rotating diameter than stock so the net effect is lower numerical gearing which could theoretically slow rolling acceleration but based on my experience the affect on acceleration is likely minimal. The larger impact is the rotating mass of the wheel/tire combination as compared with stock. A heavier wheel/tire takes more power. Look up the weight of a stock wheel/tire compared to your aftermarket wheel/tire. One other thing to consider is tire compound. A better compound vs stock can make your car quicker off the line (less tire spin). And of course better compound and wider tire can greatly improve lateral acceleration and breaking, making your car faster at a track.

 

The Vorsteiner V106 is a flow formed wheel. They kinda light but not in the same class as a BBS FI-R or HRE that can be around 17 lbs.

Lighter wheels make everything better. The question is the upgrade worth the money?

 

Hey Adam, Thanks for the reply and input, I agree with you that weight can play a role in the power needed to move the tire.

But putting the weight aspect aside, assuming we are comparing same weight rims but larger:

1- Rim Width eg. 11 vs 12
2- Tire Size eg. 305 vs 325

Will these changes affect acceleration?

Thank you for the input, that's exactly what I am trying to figure out, I don't want my rim/tire set up to be slowing me down; especially that my engine is on the way back from a rebuild/upgrade.

 

If we are disregarding the weight then the only contributing factor left is grip. Assuming that you are using the same tire brand and model for both the 305 and the 325 then the 325 will improve acceleration as more rubber is meeting the pavement (contact patch) which allows for more traction.

We are Vorsteiner's largest distributor in the world so if you have more questions that need to be answer and/or want the best pricing period shoot me over a PM or email - I'd love to earn your business.

 

Hi David/Tareq, I do think there is another variable at play when upsizing tires, which is gearing. If you put a larger diameter tire on the car, it will make the overall gearing numerically lower, which in turn takes more power for the engine to make a revolution of the tire. So putting larger circumference tires on a car can negatively affect acceleration in some circumstances. However in a car like a 911 Turbo with a lot of power, a light change in overall numerical gearing should be negligible.

This is easily translated into something that can be seen when upsizing tires - the car's speedometer at any given speed will otherwise read lower. I have a vBox and when I change to my larger circumference track tires I can see that my speedometer reads faster than it did with the smaller circumference tires.