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Tire size help
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Lpec900
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Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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PostPosted: Wed Jun 08, 2016 9:34 pm    Post subject: Tire size help Reply with quote

Hello. I have a 1971 standard bug with 2.5 drop spindles in the front, stock beam. I am getting ready to purchase tires but need to know what size so I dont rub the fender lip. Currently it has 165/80 R15 on it Right now and it rubs the fender lip.. What do u recommend. Thx.
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chickengeorge
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Joined: August 18, 2004
Posts: 5634
Location: Spokompton Warshington
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PostPosted: Thu Jun 09, 2016 12:38 pm    Post subject: Re: Tire size help Reply with quote

Take your width times .03937, multiply it by the aspect ratio, multiply that times two and add it to the rim width to get the diameter. Once you have the diameter and width, you should be able to figure out where you need to go from where you're at.
For example...

165mm times .03937 = 6.49605" x 80% = 5.1968" x 2 = 10.39368" + 15" = 25.39368"

Your current tires are 6.49605" wide at their widest and 25.39638" in diameter.

If you want to drop the diameter or width, you can use that formula in reverse once you figure out what you need to clear the fender.

You could pull the tire away from the fender by dropping the width and a little diameter with something like a 145R-15 like these http://www.thesamba.com/vw/classifieds/detail.php?id=1918509

Or you could keep the width and drop the diameter a bunch with something like this
http://www.thesamba.com/vw/classifieds/detail.php?id=1932084

Personally, I'd go with the 145's. Just getting the fender to clear is one thing, but making it look right is something completely different.
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chickengeorge
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Joined: August 18, 2004
Posts: 5634
Location: Spokompton Warshington
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PostPosted: Thu Jun 09, 2016 12:44 pm    Post subject: Re: Tire size help Reply with quote

Something like this. If you're running stock rims, the tire will sit inboard even farther than this.

Image may have been reduced in size. Click image to view fullscreen.
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heyman3000
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Joined: March 20, 2016
Posts: 27
Location: Greenville SC
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PostPosted: Wed Jun 22, 2016 6:51 pm    Post subject: Re: Tire size help Reply with quote

Its not really your tires causing your problem...drop spindles increase your front wheels track width between 1/4 to 1/2 in total...thats why people narrow there beam...im about to lower my 65...last time i lowered a bug was 1987...so ive been reading and learning !!!
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