FRAME MATERIAL !!!!!!

[drambambeis]

All new frames are made of U6 aluminium. But what about 7005 aluminium ? What could you say about it ? And also what advantages of U6 ?

[manimal]

don't forget steel.. a few of us out there still prefer it.

[chronic]

7000 series alluminum is better than 6000, however it's always a wonder if some bikes are actually made from the better alluminum as it's expensive as hell. Used mainly in the aircraft industry...
Most junk that claims to be made from 7005 alluminum is just regular 6061.
But the difference is 7000 is lighter and stronger, 6000 is heavier and weaker hah.

[such]

are You really sure 7XXX series is better than 6XXX series? Ive been told diferently.
I know for sure xc bikes made from 6xxx are more expensive than 7xxx.

Steel might be the future (talking about disc mounts :))
Carbon all the way :)

[will4eva7k]

and all those dh bikes are mainly 6xxx series aluminium

the 6 series is claimed to be more flxy compared to the 7 series which is 'more pure Al' making it more stiff but yet more brittle

[CoppellStereo]

Steel might be the future (talking about disc mounts :))
Carbon all the way :)
what about carbon disc mounts? :naughty: :slap:

[rtorrenga]

All aluminum has about the same density, so for the same amount of material the weight is virtually equal. When you factor in the strength of the material 7005 T-6 aluminum has a higher (tensile, yield, and shear) strength than a 6061 T-6 alloy. Therefore less material can be used to achieve the same strength. When machining certain items where strength is not as much as an issue as the dimensional constraints, the 6061 alloy is more common since the weight will be the same. In a frame where the tubing can be a thinner wall to save weight the 7006 alloy is the better way to go.

I don't know of any published information regarding the U6 alloy, but there are some pretty interesting claims about the material.

"Puro™ U6 aluminum alloy is 25% stronger and 20% more fatigue resistant than traditional 6061-T6 aluminum alloy. We worked with the suppliers of this material to develop custom tubes for our SlipStream fork, the lightest aluminum fork on the market." -- http://www.dahon.com/framematerial.htm

I hope this helps.

[rtorrenga]

Correction (7006 should be 7005) see below.

All aluminum has about the same density, so for the same amount of material the weight is virtually equal. When you factor in the strength of the material 7005 T-6 aluminum has a higher (tensile, yield, and shear) strength than a 6061 T-6 alloy. Therefore less material can be used to achieve the same strength. When machining certain items where strength is not as much as an issue as the dimensional constraints, the 6061 alloy is more common since the weight will be the same. In a frame where the tubing can be a thinner wall to save weight the 7005 alloy is the better way to go.

I don't know of any published information regarding the U6 alloy, but there are some pretty interesting claims about the material.

"Puro™ U6 aluminum alloy is 25% stronger and 20% more fatigue resistant than traditional 6061-T6 aluminum alloy. We worked with the suppliers of this material to develop custom tubes for our SlipStream fork, the lightest aluminum fork on the market." -- http://www.dahon.com/framematerial.htm

I hope this helps.

[drambambeis]

Thank you for your answers ! especially to rtorrenga ! ;]