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Old 01-30-2009, 02:55 PM   #1
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Racing subframes

I have been batting around the idea of mfr'ing racing subframes using thin wall chrome-moly tubing.
I was wondering what you racers would think of that?

I figure they wouldn't be unusually heavy and would have the advantage of being more able to be straightened after a get off.

Just an idea, recently found a source for said tubing but if the idea is not sound I'm not even gonna try it.

Let me know what ya think...
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Old 01-30-2009, 03:15 PM   #2
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Aluminum would be a better material. Lighter, maybe not a durable, but the whole premise of the aftermarket subframe is to save weight.
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Old 01-30-2009, 04:24 PM   #3
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Quote:
Originally Posted by kawi jm View Post
Aluminum would be a better material. Lighter, maybe not a durable, but the whole premise of the aftermarket subframe is to save weight.
part of the premise is ability to repair, also.
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Old 01-30-2009, 04:51 PM   #4
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Whats the diff?
You can repair both, but I'd go w/ alum.

I don't think anyone would buy moly. Its gonna bend the same as alum. in a crash.
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Old 01-30-2009, 04:56 PM   #5
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I seen a lot of people run yoyodyne tube subframe because they are lighter cheaper and easier to repair than the aluminum one so do it ill let you use my bike to fan one up
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Old 01-30-2009, 05:01 PM   #6
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Old 01-30-2009, 06:04 PM   #7
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i'll let you build me one
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Old 01-30-2009, 06:22 PM   #8
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u could tweak a tubular sub on the spot, where a cast jobbie (OE type) would be more likely to crack/break in half
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Old 01-30-2009, 06:29 PM   #9
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Quote:
Originally Posted by 07SLVRCBR View Post
u could tweak a tubular sub on the spot, where a cast jobbie (OE type) would be more likely to crack/break in half
That was my thought.


How much, generally do OEM cost on Ebay?
How much are aluminum subframes?

Also, I agree that aluminum would be lighter but I thought maybe less repairable...
You might be surprised how light thin wall chrome-moly will be. I'm estimating less than 2 pounds, based on a shorter than stock design.

Thanks, to those who offered their help in fabbing, I might need that if I decide to do this.
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Old 01-30-2009, 06:34 PM   #10
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Not sure but I know ygr yoyodyne are a lot cheaper than oem.
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Old 01-30-2009, 06:47 PM   #11
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Old 01-30-2009, 06:59 PM   #12
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i would think a getoff where the sub frame gets bent prolly ends your weekend of racing,i know it does on most trackays per the org running it..
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Old 01-30-2009, 07:03 PM   #13
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Quote:
Originally Posted by tonyt915 View Post
Not sure but I know ygr yoyodyne are a lot cheaper than oem.
I just checked Yoyodyne's website.
For an '04-'05 GSXR600/750 (because that's what I have) they wanted $460.

I think I could do it for around half that.
If I used Alum. I could do it even cheaper but I still think Chrome-moly would be light enough and MUCH more durable, as far as being able to be bent back into shape.
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Old 01-30-2009, 07:10 PM   #14
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Like I said your welcome to use my bike for the cbr setup
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Old 01-30-2009, 08:26 PM   #15
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if you need one for a 06-07 gsxr600 i can prolly help you too(have a yoyodyne im not using).
i think youre right,aluminum is lighter but have to use more of it for strength.so 6 of one or half dozen of the other IMHO.


ps. more peeple can weld steel rather than alum for repairs.
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Old 01-30-2009, 08:31 PM   #16
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The 09 r1 subframe is magnesium and easily detaches for access to the shock. Would be cool if you could make yours detach easily, too. I know magnesium would be out of the question, but it's pretty cool as an oem part.
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Old 01-30-2009, 09:20 PM   #17
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fiberglass.

one peice rear subframe, seat, & tail layed in fiberglass.

once you get the hang of fiberglass & stress points & fitment right some one off CF tails would be killer.

maybe a small aluminum miniframe to mount the factory seat...

you'd have to be able to stress test it for racing.
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Old 01-30-2009, 10:57 PM   #18
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Old 01-30-2009, 10:58 PM   #19
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Quote:
Originally Posted by tonyt915 View Post
Like I said your welcome to use my bike for the cbr setup
Quote:
Originally Posted by rc51eviltwin View Post
if you need one for a 06-07 gsxr600 i can prolly help you too(have a yoyodyne im not using).
i think youre right,aluminum is lighter but have to use more of it for strength.so 6 of one or half dozen of the other IMHO.


ps. more peeple can weld steel rather than alum for repairs.
Thanks for the offers.
Still just an idea but I 'preciate the feedback.
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Old 01-30-2009, 11:06 PM   #20
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Stress test for racing?

Its only gotta hold up your and a light tailpiece, less than a street subframe.
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