I measured my Swift sway bars with a set of calipers.

Fronts are 26mm

Rears are 26.5mm

Solid construction, not hollow.

 

Saner:
Useful information:
Received this message from John at Saner in an email yesterday:

The 2000-2001 OEM (stiffest OEM bar made) front swaybar is rated @ 295.5 LB PER IN.
SANER SOFT SETTING - 566.0 LB PER IN.
SANER CTR SETTING - 644.0 LB PER IN.
SANER STIFF SETTING - 739.3 LB. PER IN.

Comptech:

According to the specifications provided with the Comptech co-axial adjustable front sway bar, here are the ranges of stiffness in the 5 bolt positions. In discussions with a representative from Comptech, they claimed that these rates were relative to the "00, '01 OEM bar.

Original Comptech Adjustable Sway Bar - +27%, +44%, +67%, +97%, +124%
corrected values
New Design Comptech Adjustable Sway Bar - +62%, +82%, +102%, +136%, +178%

Small fortune racing:
Stock Sway Bar is approximately 300# per inch at the link.

The .188" wall Hollow Bar has a max of 625# /in and a minimum of 345 #/in. Each step is 46 #.

The .25" wall Hollow Bar has a max of 832# /in and a minimum of 460 #/in. Each step is 62 #.

The Solid Bar is a Max of 954#/in and a minimum of 531#/in. Each step is 70#.


Remember these are all at the link, not the wheel.

 

So you are saying that the saner varies from 191%- 250% stiffer than oem??

thats ALOT

 

ive always liked ST suspension sway bars. ill be picking some up soon for my s2 not sure what size yet.

 

Take 100 off your % to compare to the comptech ratings.

 

One final take on the OEM swaybar sizes. These are U.S. market parts; Canadian cars might be different? (And it's almost certain that European and Japanese cars are different.)
The "stiffness" rating is relative to the original MY00-01 bars. Note that the swaybars typically contribute 25-35% of the total roll stiffness; the coil springs provide the rest.

It's interesting that the dimensions of the front bar appear to have been unchanged from '02 thru '07, but there have been three part numbers (-013, -023, and -033) during that period. While this could indicate changes to the material specification (which might affect stiffness), part # changes are more often due to change in suppliers, or even just internal bookkeeping. I think it's safe to assume that the actual roll stiffness of the three parts is essentially identical.

Lastly, the CR front bar has the same effective rate as the MY00-01, but does it by using a larger diameter and thinner walls. This actually saves a small amount of weight (the donut-shaped cross-sectional area is ~6.5% smaller).

 

All things remaining the same, if I just change my MY06 Bars to the CR, I should see improved "performance," and less body roll, but at what expense?? Just ride quality??

If so, I can live with that....

 

Sway bars should have little affect on ride quality. They only assist the springs when the sides are moving in opposite directions of each other, i.e. body roll.

 

that's true, ride quality is determined by the spring rates. my fault!

I guess, if i'm not mistaken, uping thickness of the sways require more grip to compensate or else, you'd just wash out easier.

 

for straight/speedway type bars

http://www.circletrack.com/car_racin...tor/index.html