Lowering Bolts?
Thread Starter
Racer
Joined: Apr 2007
Posts: 367
Likes: 1
From: Shakopee Minnesota
Lowering Bolts?
I have heard that you can buy "lowering bolts" to lower your c4. I have an '86 with 17" z06 rims, so I would like to lower the car about an inch. What would be the most cost effective way of accomplishing this without "too much work"?
Another question... Using the tire size calculator, the wheels I have now (size slips my mind) were supposed to be the exact same size as the stock 16's, but my car sits a little higher with the new wheels... what gives?
Another question... Using the tire size calculator, the wheels I have now (size slips my mind) were supposed to be the exact same size as the stock 16's, but my car sits a little higher with the new wheels... what gives?
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
To calculate tire diameter (eg: 255/50/R16)
255 x 50 / 1270 + 16
=26.0 inches.
And yes, the overall diameter is normally dead nuts accurate even between brands of the same size. This is because they don't want to compromise speedo accuracy.
255 x 50 / 1270 + 16
=26.0 inches.
And yes, the overall diameter is normally dead nuts accurate even between brands of the same size. This is because they don't want to compromise speedo accuracy.
Last edited by CentralCoaster; Dec 7, 2007 at 04:21 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CentralCoaster
To calculate tire diameter (eg: 255/50/R16)
255 x 50 / 1270 + 16
=26.0 inches.
And yes, the overall diameter is normally dead nuts accurate even between brands of the same size. This is because they don't want to compromise speedo accuracy.
255 x 50 / 1270 + 16
=26.0 inches.
And yes, the overall diameter is normally dead nuts accurate even between brands of the same size. This is because they don't want to compromise speedo accuracy.
It is called "plus sizing". As a rule, to go up 1 wheel diameter size, (16" to 17") you also go up one in the aspect ratio (/50 to /40). You can figure the diameter, like it looks as though CenterCoaster has, or you can look it up on one of the tire dealers web sites (Tire Rack?). Since you don't know the tire sizes involved, here, it is impossible to comment on the specifics.
Also, tire sizing is an inexact approximation. The actual dimensions can vary from one manufacturer to another. They can even vary from tire to tire with a given manufacturer.
RACE ON!!!
Last edited by CFI-EFI; Dec 7, 2007 at 07:38 PM.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
In my experience the diameters are very very close to what the equation above gives you. They also publish revolutions per mile, an easy way to compare sizes on tire rack. I assume that info is straight from the manufacturer.
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
This is all you need
http://www.mamotorworks.com/corvette-1-0-1088.html
http://webpages.charter.net/khasting.../lowering.html
Let us know how it went !
http://www.mamotorworks.com/corvette-1-0-1088.html
http://webpages.charter.net/khasting.../lowering.html
Let us know how it went !
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Le Mans Master
Joined: Aug 2003
Posts: 9,884
Likes: 3
From: Magnolia Mississippi
St. Jude '03-'04-'05-'06-'07
Or you can get a grade 10, bolt 11-12", lock washers and dual bolts from fastenal for about $12.00 and lower the back... if your not interested in the fronts...
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
I would go with the midamerica kit,i will buy it soon
and about the angles...yes,its funny how a vette or a person angles on a picture can change the whole appareance
the right angles are hard to recognize,but with a good taste everything its possible,so dont forget about the 2% rack angle !
front always has to be lower (nice way to stay on topic lol! )
and about the angles...yes,its funny how a vette or a person angles on a picture can change the whole appareance
the right angles are hard to recognize,but with a good taste everything its possible,so dont forget about the 2% rack angle !
front always has to be lower (nice way to stay on topic lol! )