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Im having my mild steel cage taken out and replaced with a moly one. Does a moly cage go brittle after 4, or 5 years? Where a mild steel cage can last up to 15 years? If this is the case, ill just save my money. The weight difference cant be that much anyway. Im not sure if i should stick with what i got, or replace it.

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No, a moly chassis does NOT turn brittle in 4 or 5 years
that BS. The weight isnt all that much lighter but
it is lighter, I dont have the numbers in front of
me what the difference is in a foot. Its up to you
weather you replace it or not, they do cost more
because its all tig welded, but a moly chassis is
more rigid

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I'd do a moly cage. It will last forever, it's worth more if you sold the car. You can put the weight you save somewhere else, or just save the weight.

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I also agree with MRPBODY, the moly cage is stronger, safer, lighter and better in a crash, especially on a drag car. That being said NASCAR wants mild steel, probally because a lot of the good old boys do a lot of the work themselves in the lower, slower local race cars and they don't want them trying to weld chrome moly with a OX Acetelene torch

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I also agree with MRPBODY, the moly cage is stronger, safer, lighter and better in a crash, especially on a drag car. That being said NASCAR wants mild steel, probally because a lot of the good old boys do a lot of the work themselves in the lower, slower local race cars and they don't want them trying to weld chrome moly with a OX Acetelene torch

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I believe they use mild due to them busting up their
cars all the time and always replacing tubing and
they have a PILE more tubing in their cars plus
they have a pretty high minimum weight

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Has to do with the tube absorbing shock loads. Moly being more rigid, transfers more load to the driver than mild steel.

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moly is more brittle, so wouldn' it be more prone to cracking or is that just a myth.

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Why is it more brittle Its stronger with less flex

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While it is true mild steel has a little 'give' to it, these top 2 examples of 10 second 'mild steel' cages gave way too much..... the top one was coming in on the driver and had already failed......

the second pic of a buddy of mines cage also was 'giving' and was a hairs breath away of crushing him when he got into a little (very little) antifreeze of another car that had just run.

It may be hard to see in these pics unless you can zoom in, but both these mild steel cages deflected WAY too much for safety.






This next moly caged car hit and went over the wall at Orlando and disentegrated, but the moly cage did not deflect at all and integrity of chassis was still 100% intact.

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A picture is woorth a 1000 words, these three speak volume of why all the Pro cars use chrome moly tubing in there cars. Weight and speed have a lot to do on the total impact loads, I would rather be a in a car(and I am) with a chrome moly bar or cage than mild steel any day that I'm in a crash

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While it is true mild steel has a little 'give' to it, these top 2 examples of 10 second 'mild steel' cages gave way too much..... the top one was coming in on the driver and had already failed......

the second pic of a buddy of mines cage also was 'giving' and was a hairs breath away of crushing him when he got into a little (very little) antifreeze of another car that had just run.

It may be hard to see in these pics unless you can zoom in, but both these mild steel cages deflected WAY too much for safety.






This next moly caged car hit and went over the wall at Orlando and disentegrated, but the moly cage did not deflect at all and integrity of chassis was still 100% intact.

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My mild steel cage is only legal for 10.0.

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Is this something new