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I set up a shimano dyno hub with lumotec for front light; three different cat eyes on the rear seatpost. I have been riding at night on and off...
Good chance you have occult asthma!!
I am mad at Schwinn because they had a really great bike in the 60's; then they just dropped everything. They never really put any money into R & D
You learn more when you buy on-line. You have to check threading and size;
I have bought a cheap micrometer for this.
But, I live in a rural...