Turns out is real, from a couple of years ago.
Looks kinda cool, shame about the motor
https://www.bikebound.com/2024/03/26/xs400/
Odd setup for the brakes/suspension...
Patent Pending: Yamaha XS400 “Roadster”
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KungFooBob
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Patent Pending: Yamaha XS400 “Roadster”
I saw a vid on Friendface and thought it was AI so had a google.
Turns out is real, from a couple of years ago.
Looks kinda cool, shame about the motor
https://www.bikebound.com/2024/03/26/xs400/
Odd setup for the brakes/suspension...
Turns out is real, from a couple of years ago.
Looks kinda cool, shame about the motor
https://www.bikebound.com/2024/03/26/xs400/
Odd setup for the brakes/suspension...
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weeksy
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KungFooBob
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Re: Patent Pending: Yamaha XS400 “Roadster”
Most importantly, Roman wanted to test a new front suspension concept he’s been developing, a Progressive Upside Down Fork (PUSDF) assembly intended to minimize dive under braking — a system he’s in the process of patenting. There are three patent claims:
1. Progressiveness — for example, for a 120 mm suspension travel of the wheel, there is a 60 mm lift in the fork.
2. When springing, the axis of the front wheels is pushed forward and thus eliminates the shortening of the wheelbase.
3. Separation of spring and braking force — the motorcycle does not dive when braking.
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Skub
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Re: Patent Pending: Yamaha XS400 “Roadster”
It's a very tidy bike visually. The C90 fork/suspension arrangement sort of runs against the 'simple' ethos. Looks too clever for me.
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Bigjawa
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Re: Patent Pending: Yamaha XS400 “Roadster”
Dive? There's about 25mm of fork travel....KungFooBob wrote: Mon Mar 30, 2026 9:00 pmMost importantly, Roman wanted to test a new front suspension concept he’s been developing, a Progressive Upside Down Fork (PUSDF) assembly intended to minimize dive under braking — a system he’s in the process of patenting. There are three patent claims:
1. Progressiveness — for example, for a 120 mm suspension travel of the wheel, there is a 60 mm lift in the fork.
2. When springing, the axis of the front wheels is pushed forward and thus eliminates the shortening of the wheelbase.
3. Separation of spring and braking force — the motorcycle does not dive when braking.
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Rockburner
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Re: Patent Pending: Yamaha XS400 “Roadster”
The forks are certainly interesting....
non quod, sed quomodo
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Taipan
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Re: Patent Pending: Yamaha XS400 “Roadster”
Looks like he's solved a problem those forks didn't have! Quite like the simplicity of the rest of it though.
NC750X mpg 
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