100mm or 120mm fork???

Fanis
Fanis Posts: 101
edited January 2008 in MTB beginners
Hi
I want to change my old RST 100mm fork with a new one Marzocchi/Rock Shox but i don't know what is better to install 100mm or 120mm???I ask this because i like to do small jumps/little downhill.Will i have problem with my hardtail bike geometry???

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