Originally Posted by
jasong
There is a sleeve that goes over the 7/8 tubing that brings it to the 25.4 size, mayube this is what you're talking about?
That's the one.
Also internal to the 7/8 OD tubing is another tube that pairs the two together.
I appreciate the fact Bike Friday does both. When it comes to potential safety issues, this type of redundancy is OK by me.
The flex is most noticeable (and felt) on the tandem when my stoker cranks hard and pulls on the bars. Just to make sure, I've sat back there and pushed and pulled on the bars: I can see the flex. For a regular rider or captain, I assume it's easier to deflect the torque because the handlebars rotate, but all bets are off if you stand up on the pedals and pull back hard.