More Front Suspension Advice

[Fredzep]

I was reading an earlier post on front suspension advice and have a related question. My bike is a
'97 Diamondback Zetec 2.1 with a 97 Judy C Rockshox fork. I replaced the spring and spacer to tune
the fork to my weight and taste but don't like it anyway.

The question is if I could find something to upgrade the front suspension without altering the
geometry of the bike.The current forks have only 63mm of travel.Would a fork with 85mm or 105mm like
on a Marzocchi I was looking at be incompatible with the geometry of the bike.

Any advice would be greatly appceciated.

Fredzep