8 Speed Shifters with 9 Speed Cassette?

When you upgrade from 8 to 9 speed drivetrain, you need new shifters, chain, cassette and perhaps a new derailleur.
Today I’m going to correct this Trek FX 2 to the point where a 9 speed drivetrain is supposed to be.
Can the 8 speed shifters work with the 9 speed cassette? No, the spacing between the 8 and 9 speed cassettes are different and they won’t work well together.
The 9 speed chain is also thinner than the 8 speed, so if you are using a 8 speed on a 9 speed cassette, it would rather jump gears or hit the cassette.
Parts installed:
Shimano Deore LX Dual Control
KMC 9 speed chain with quick links
Track: Feel - Land of Fire [Audio Library Release]
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Danyo Sports Channel Episode 147
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[@kris4645]

It works perfectly, with the friction shifters! It works even with the 10 speed cassette! I tried it,4 years ago!😁

[@trekkeruss]

Honestly, it is pointless to "upgrade" from 8 to 9 speed. It doesn't make the bike faster, it doesn't make the bike shift better, it doesn't (necessarily) provide higher or lower gears. The only way it makes sense if it everything is worn out and/or broken and you have to replace everything anyway.

[@stuvademakaroner9607]

Shimano's 9 speed rear derailleurs are much more fussy than 8 speed ones. SRAM and Microshift make more sense for 9 speed

[@jeremiah6554]

May you talk about bullhorn handlebar?