Anyone use a chrome-moly rollbar?

[Guest Anonymous]

I believe they still allow it in the regs but not at a smaller diameter to save weight except in pre 1994 cars that already have current log books.

http://sports.racer.net/docs/rules/2006/GCR2006.pdf

GCR in 2006

section 18.6.C

C. Minimum tubing sizes for (all Showroom Stock, Touring

and Improved Touring Category auto-mobiles registered

after June 1, 1994) for all required roll cage elements (All

dimensions in inches):

Up to 1500 lbs. 1.375 x .095 DOM / Seamless / Alloy

1501-2200 lbs. 1.500 x .095 DOM / Seamless / Alloy

2201-3000 lbs. 1.500 x .120 DOM / Seamless / Alloy

1.625 x .120 DOM / Seamless / Alloy

1.750 x .095 DOM / Seamless / Alloy

(American Sedans may construct to these specs regardless of weight.)

3001-4000 lbs. 1.750 x .120 DOM / Seamless / Alloy

Over 4000 lbs. 2.000 x .120 DOM / Seamless / Alloy

Note: ERW tubing is not permitted in any car registered with

SCCA after of 01/01/2003.

So yes you can run it. No it won't save you weight. Yes it will be stronger if welds are done properly. Yes it will cost atleast 2x as much. No it won't make a difference in winning. The reason people run mild steel is tech inspectors have a trepidation against 4130 and know how to check DOM with ease. That and it's arguably as strong in a crash because it deforms and not shatters and anyone can make it safely with a mig gun instead of a tig artist.