Thinking about getting an aluminum subframe for my project 98 YZ250. Does anybody know the weight difference between the two? Any other arguments for aluminum over steel subframes?
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Aluminum vs steel subframe YZ250
Posts: 456
Joined: 10/11/2016
Location: Elk Grove, CA USA
Posts: 923
Joined: 9/7/2012
Location: MA, USA
Subframe would save you a couple pounds I’d imagine. No reason not to as it’s lighter and doesn’t need to be as strong as steel.
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If you're not mixing gas, you're not haulin ass.
Posts: 548
Joined: 12/19/2016
Location: Wichita, KS USA
My 98 yz steel subframe would bend if you just looked at it wrong. Everytime I had a tip over instead of the handlebars I would be kicking the subframe to straighten it out. Aluminum subframes are much stronger with the added bonus of the weight savings.
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Posts: 683
Joined: 12/30/2015
Location: Nor Cal, CA USA
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Joined: 7/19/2018
Location: Wildomar, CA USA
not all aluminum is the same . two of the "strongest" ones are 7075 t6 and 7068 t6 . both of these are "stronger" in most aspects than 6060 t6, however, all aluminum bends/flexes in shear about the same irregardless of what grade it is, and about 66% easier than steel does. i am using 7068 aluminum for my rear axle and axle spacers and swingarm bolt on my 1980 yz250.
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Posts: 456
Joined: 10/11/2016
Location: Elk Grove, CA USA
I was about to find a 2001 aluminum subframe on eBay for $25.
When I get it I'll compare the weight difference and post the results online for all to see.
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