Originally Posted by
fearfeasog
it's conceivable that an aluminum part attached to a steel part might pose some problems because of the 2 materials differing expansion/contraction rates.
ΔL=α Li ΔT
Change in temperature = ΔT= 90F-(-20F) = 32C-(-29) =61C
α = Coefficient of thermal expansion for steel is 12*10^-6 C^-1
For AL 23*10^-6 C^-1
Length initial = Li = 1mm of steel ΔL = 0.0000012/C(1mm)(61C) = .000732mm
Length initial =Li = 1mm of AL ΔL = 0.0000023/C(1mm)(61C) = .0014mm
Kind of redundant but the AL expands and contracts twice as much as steel. I think I need to figure out the
RATE at which they expand and contract to see if there could be any harm done.
I'm not sure if this means anything at all. I think your bike will be fine though, The dry heat probably is not good for the rubbers but they are consumable anyway. Props to you for riding in such cold weather. Were still in tshirts and shorts here in Florida...