Fork info

mixmaster

New Member
I need to know the makes of sport bikes that have "Inverted Forks". At least i think thats what they are called, the slider is attached up top while the tubes come out the bottem and have the axle attached to them. Can you help me out?? Thanks..
 
Not just sport bikes either, a ton of new sport cruisers have them. Most of the time they are reffered to as USD forks, which simply means "UpSide Down". They got all technical on that name didn't they! Hahaha! :D

just search USD forks on ebay, you will find plenty!
 
Depending on your application, there are dirtbikes out there that run em' too. There long though. Usually run about 12" of travel which is way too much for most applications. They are super cheap though. Ive seen complete front ends go for $100.
 
USD, DOHH! Thanks, and keep em coming. So are they better then my old style one's?? Or do they just look cooler? Would you put them on??
 
They have less unsprung weight which lets your springs and dampers work more efficiently, and they also tend to be a much larger diameter and thus stiffer. Those are both good things. However, if that were the only change on a 30+ year old bike, it would probably expose other weaknesses in the frame design.

They look really cool but unless you're a fab-master and you have plans to address the rest of the bike (frame, rear suspension, etc), I'd skip it and just buy some nice tires.

Starter thread about the current bike-of-the-month (see banner ^^^^^) which has inverted forks:
http://dotheton.com/index.php?topic=10971.0
 
Personally, I'm not a great fan of USD forks (although I have several sets)
They are a real PITA to service and frequently need special tools for 'simple' oil change
They ALWAYS use a lot of suspension fluid, (450~700cc each leg) you can't use ATF or 'ordinary' fork oil (unless you want forks that feel like they are full of gravel)

PJ
 
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