Silly question - Upside-Down Forks

[theturbs]

Forgive the silly question, but what exactly are "upside-down forks", and what are the advantages and disadvantages of having them?

Thanks very much

[catso]

The spring & internals part are in the top so stay still whilst the (lighter) tube moves up and down, meaning less unsprung weight (weight that moves up & down with the wheel) which makes the suspension work better, also the thicker part is held in the yokes so upside-down forks are stiffer, which can also mean that for the same required stiffness they could be lighter - basically make a bike handle & stop better which is why all sport/race bikes use them.

[RemaL]

like he said

[telecat]

And they are totally useless on off-road bikes due to the crap getting into the seals.

[theturbs]

Thanks gentlemen