Jason222 Posted February 14, 2008 Report Share Posted February 14, 2008 my friends DOB frame cracked after a week in 2 different spots.... after 2 week it snapped....Was it the first gen DOB or newer model? Quote Link to comment Share on other sites More sharing options...
Muel Posted February 14, 2008 Report Share Posted February 14, 2008 It will have been one of the first gen ones. They wouldn't have marketed the new model if it snapped that quick. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted February 14, 2008 Report Share Posted February 14, 2008 Lighter stuff is good. Should be able to get my bike under 8kg with a frame and pair of rims (and some other tweaks). Like all products, they are suited to certain customers - for light compy people the Magnesium alloy products are excellent. Quote Link to comment Share on other sites More sharing options...
t33zr Posted February 14, 2008 Report Share Posted February 14, 2008 Was it the first gen DOB or newer model?That was the first model... Quote Link to comment Share on other sites More sharing options...
sapu Posted February 14, 2008 Report Share Posted February 14, 2008 There's alot more than just a trace of magnesium. I hear it's more around 40%. If it was just a trace the alloy would weigh more or less the same as any aluminium alloy.magnalium , alloy of aluminum and about 5% magnesium. Although weak and soft in the elemental state, magnesium alloys with aluminum, manganese, zinc, tin, zirconium, and cerium to produce alloys useful in engineering materials.Magnalium (5% magnesium)/used in airplane bodies, ladders,etc. Quote Link to comment Share on other sites More sharing options...
Tomm Posted February 14, 2008 Report Share Posted February 14, 2008 Thanks for that, sapu. 5% is still more than I'd imagined so maybe it will make a slight difference to the price of raw materials. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted February 14, 2008 Report Share Posted February 14, 2008 finally found some info on magnalium (trade name)...the magnesium content can vary from 5-50%, so it's alot lighter than say 6000 or 7000 series alloys..it has very good fatigue properties, which is very important with the cyclic/hopping loads in trials...just because the frames are fairly cheap doesn't mean they are of poor quality- did you know that a Zhi frame costs the equivalent of £50 in china? and that's including profit....people who think that magnesium just burns people if they look at it wrongly...aluminium reacts in a very similar way! give it a chance people! like others have said, unlike commercial alloys and steels, there hasn't been big investment in these materials and r&d is still very much in progress...no doubt this stuff will replace traditional alloys in the near future (in low weight situations...)adam Quote Link to comment Share on other sites More sharing options...
Gandalf the Yellow Posted February 14, 2008 Report Share Posted February 14, 2008 i think a lot of people are missing the point. on tarty and trials-uk it is stated as a comp frame. so for sensible comp/natty riding (which is what the frame is marketed for) then i don't see why it'll crack in places, unless you start doing massive drops/drop gaps and hooks.its like your xc marlarky, scott for example make their CR1 carbon in their scale/spark series soo light so its SUITABLE for their high end competition uses. and even the high end ransom come in their carbon (though might not be CR1 carbon)you wouldn't use a road bike for off road will you? people need to look at what the bike is aimed for..steve Quote Link to comment Share on other sites More sharing options...
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