Trying to understand offsets/disk types
12-01-06, 03:37 PM
#1
Trying to understand offsets/disk types
The offsets, not the disk types, determine how much the wheels stick out, correct?
I was looking at an old VIPCAR magazine. It has a section called best matching wheels for toyota ucf31 which is ls430 here. These are a few that are on the magazines
amistad r 19x8 +34 low, 19x9 +45 low
vienna sovereign 19x9 +44 hi, 19x10 +49 normal
locksmice mesh 19x9 +33 hi, 19x10 +27 low
duchatelet ii 19x9+37, 19x10 + 37
All these are quite different. Can someone explain how these could fit?
Thanks in advance.
I was looking at an old VIPCAR magazine. It has a section called best matching wheels for toyota ucf31 which is ls430 here. These are a few that are on the magazines
amistad r 19x8 +34 low, 19x9 +45 low
vienna sovereign 19x9 +44 hi, 19x10 +49 normal
locksmice mesh 19x9 +33 hi, 19x10 +27 low
duchatelet ii 19x9+37, 19x10 + 37
All these are quite different. Can someone explain how these could fit?
Thanks in advance.
Last edited by pvo; 12-01-06 at 03:52 PM.
12-02-06, 01:00 AM
#2
offset AND width together determine how much wheel stick out, they go hand in hand with each other, offset is meaningless without width. given same width, the lower the offset the more it sticks out
the ones above, people just fit different levels of "stick out" of wheels, probably from normal to vip style, etc...
the ones above, people just fit different levels of "stick out" of wheels, probably from normal to vip style, etc...
12-02-06, 04:36 AM
#4
offset AND width together determine how much wheel stick out
how did those rims fit? simple yet complex - various tire sizes, camber settings, how you roll/pull/shave your fenders, or the heights that they sit at.
12-02-06, 02:56 PM
#5
Pole Position
Offset is the location of the flat mounting surface of a wheel relative to the wheel's centerline. Negative offset means the mounting surface is toward the center of the car, positive offset means it is toward the outside of the car, or the wheel is "pulled in" toward the center. Offset affects many things other than just whether the wheel has the appearance of "sticking out" past the fender. The wrong offset can cause rubbing problems when the suspension is compressed or the wheel is turned. Offset affects the steering geometry's scrub radius, possibly leading to problems with torque steer or self-centering characteristics. Offset also affects the suspension's motion ratio, which directly determines the effective spring and damper rates. Potentially, in a very heavily loaded vehicle, or with extreme changes in offsets, wheel bearing life can be affected, but this is more often talked about by truck people than by small car enthusiasts. It is very, very important that the proper offset wheels be used.
The formula to find offset located above the photo is incorrect. The correct formula is: Offset = Backspace - (width/2)
While not directly a matter of offset, brake caliper clearance is a related issue. If you have, or plan to have big brakes on your car, be sure that your wheels, or the wheels you are going to use, will fit over the calipers. Spacers are available to solve the problem if they don't, but it is best to get a wheel with enough dish to meet your offset specs and still fit your brakes. Consulting the wheel and brake manufacturers ahead of time is wise. Many aftermarket brake companies even have templates of their brakes available that you can easily check against any wheel.
source: http://www.sportcompactcarweb.com/te...cc_wheelguide/
disk, put in its simplest terms, is basically caliper clearance.
a high disk wheel will ultimately have more caliper clearance than a s-low disk wheel; assuming they have the same offset. disk also has an affect on lip size. a 19x11.5 -11 HighDisk wheel would have less lip than a 19x11.5 -11 S-Low.
i.e. for the same width of a wheel, you get more lip with a low disk wheel then you do with a high disk wheel. thus, the pro is that you get more lip. the con is that you cannot necessarily run a low disk wheel on a car that requires a lot of room for brake caliper clearance. hence, cars with large brakes standard, or people that get big brake kit (bbk) upgrades typically have to get a higher disk wheel.
O disk - superlow (no big brake)
A disk - low disk
R disk - high disk (big brake)
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