Sad story! I recently broke the seat stay on my Quasi while pulling a Bob trailer doing trail work. Went through my local bike shop to see if Titus had a replacement or could weld up a stay. The answer was we don't have any more left.
So if any one has a seat stay for an old Quasi, I would be interested in buying it.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Quasi seat stay wanted