Top or bottom swing...?

Got a general MTB question that doesn't fit anywhere else? Here's the place.
mudface
Posts: 1732
Joined: Wed Jun 16, 2004 22:21 pm

Postby mudface » Fri Jun 01, 2007 15:09 pm

yes it matters.

tinytjf
Posts: 736
Joined: Fri Jun 16, 2006 11:39 am

Postby tinytjf » Fri Jun 01, 2007 15:18 pm

Sheldon has this to say about Top Swing:

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Top-Swing ©
Most front derailers use a parallelogram which is fixed (attached to the derailer body) at the top, with the moveable cage attached to the bottom link of the parallelogram. Many of the newer Shimano units are built "upside down": the bottom of the parallelogram is fixed in place and the cage attaches to the top link.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

So I'm guessing yours is Bottom Swing as that sounds more conventional but f**k knows to be honest. Just trying to be slightly more helpful than mudface. [:P]

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mudface
Posts: 1732
Joined: Wed Jun 16, 2004 22:21 pm

Postby mudface » Fri Jun 01, 2007 15:32 pm

were you expecting me to be helpful?

oh - i see.

bottom swing
The derailleur cage is mounted to the bottom of the four-bar linkage that carries it. This is the most common type of derailleur.

top swing
The derailleur cage is mounted to the top of the four-bar linkage that carries it. This alternate arrangement was created as a way to get the frame clamp of the derailleur closer to the bottom bracket to be able to clear larger suspension components and allow different frame shapes. The compact construction of a top swing derailleur can cause it to be less robust than its bottom swing counterpart. Top swing derailleurs are typically only used in applications where a bottom swing derailleir will not fit. An alternate solution would be to use an E-type front derailleur, which does not clamp around the seat tube at all.

mudface
Posts: 1732
Joined: Wed Jun 16, 2004 22:21 pm

Postby mudface » Fri Jun 01, 2007 15:38 pm

didn't read post properly - thought he meant pull.

have amended post.


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