Originally Posted by
HillRider
Again, you are correct but, IIRC, those joints are pressed together as an interference fit as well as being bonded. That way the thermal expansion either increases the joining force if the steel is outside or reduces but doesn't eliminate it if the Al is outside.
The fact that so many of these frames have survived over 20 years says the problem isn't fatal.
Nor should one limit their speeds to 10mph as was exaggerated in a previous post.