Technical > Wheel & Tire Forum
Tire / Wheel combo Diameter
s3racing:
Probably a Nube?
I’m running Factory Boxster Tiresizes on my car205/50zr17 front and 255/40zr17 rear
Having rubbing issues and a very bad turn radius to try remedy that I was thinking of going down an aspect ratio to 205/45zr17 or 205/40zr17up front and leave the tires on the rear as they are. But then they will have a staggered diameter. Will that cause me a lot of handelling issues I again an 1” to 1.5” in hight clearance Beter said half `that which could make quite a difference for me.
Just worried about brake and handelling issues
Anyone a
Have any real world experience with running staggered tire sizes in regards to overall diameter differences?
Bruce:
How wide are the wheels?
Reducing the tire size like you suggest won't hurt handling much. You will still have a lot more rubber on the ground than most other Beetles. You will have so much tread contact area that it will take a lot to lose traction.
Many don't know that when you reduce the aspect ratio only, the actual tread contact width increases. A 205/40 will have a wider tread contact than a 205/60. On the other hand, a 205/40 will have a shorter tread contact pattern than a 205/60.
Over the years I've had 7 and 8" wide wheels on my car. I've run 205/50, and 205/55 on the front, and 225/50, and 215/60 on the rear. In my experience, the rubber compound was the biggest factor determining grip, not the size.
What brakes?
s3racing:
7” x 17”Boxster wheelsfront and 8.5” rear
2001 Boxster front and rear calipers and discs on 944 hubs and e-brake set up.
Was just worried as the fronts will have a considerable diameter difference to the rears if I change.
Guess I might have to play with the brake bias a bit to counter the effects. I have a balance bar on my peddle set up and a bias adjuster to my rear brakes. So can play with those a bit to get the brake balance right.
Brenticon:
From my understanding, the first numbers are the actual width of three tire in mm.
The second set of numbers are the percentage of the first number, which becomes the height of the site wall.
I'm confused how changing the aspect ratio changes width?
Brenticon:
I use this site
https://tiresize.com/comparison/
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