Stumpy frame diameter?

Schoey
Schoey Posts: 64
edited November 2007 in MTB buying advice
Need a new front mech for my '04 stumpy. It's the Hard tail model.... alloy M4 frame (think the new crop of rockhoppers are the same frame now?). Not sure what diameter the frame size is?

seen this... www.evanscycles.com/product.jsp?style=20695

Do I need option A or B?

# Option A = 34.9mm Clamp with Dual Pull and Conventional Swing
# Option B = 31.8/28.6mm Clamp with Dual Pull and Conventional Swing

Thanks in advance!

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