05/15/2026
In the 90’s we worked with John Castellano on a few memorable bike projects.
John is an MIT educated engineer who has been building cool things all his life. Take a peek at his motorized unicycle in one of the photos. We devoted three entire posts in our 25 stories history that you can find on the Ibis website. It’s a fascinating read. Go check it out!
John is well known for his Sweet SpotĀ® full-suspension patent. Using his technology, we first built the Szazbo, an aluminum full suspension bike with 5” of rear wheel travel.
Next came a remarkable bike that John ruminated in his giant brain for quite some time. It was call the Ibis BowTi. Made from titanium, it had 5” of rear wheel travel with no pivots. No pivot means less maintenance and lighter weight. At about 5 pounds for the frame with rear shock, we could build the BowTi into a sub-24 pound full-suspension bike.
Here’s some BowTi marketing speak from back in the day:
“The BowTi features a custom designed tubeset of Ti-3Al/2.5V manufactured to our specifications by Ancotech. The frame “pivots” around the point where the down tube and the bow-stays cross. Because this virtual pivot is located at the Sweet Spot you get 5” of plush travel without bobbing when sitting, standing or sprinting.
And it’s durable too. Just like metal springs, or the leafsprings in your truck, the BowTi’s flexing members will hold up ride after ride.
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