[paweliania]

I have a 2007 Rockhopper 21" and would like to change out my Front Derailleur, currently I have the Shimano Acera M-330. I dont know what size clamp I need. Can anyone tell me?
Here is a link to the info on my bike: http://www.specialized.com/us/en/bc/SBCBkModel.jsp?spid=22177&menuItemId=0
Thanks,
Paul

 

[Velosoxraptor]

im 90% sure its 34.9mm since you have a 30.9mm seat post like my 2010 hopper. Btw stay with shimano on the front.

 

[paweliania]

Thanks for the response. I took the existing derailleur of yesterday its a 31.8 actually. The Seat tube changes size in the middle to the smaller diameter...

 

[Velosoxraptor]

Wow, i looked hard at the pic and it looked strait. O well glad you got it figured out!