"TacomaBoy" <
[email protected]> wrote in message
news:[email protected]...
| "Nelson Binch" <
[email protected]> wrote in message
|
news:[email protected]...
| > "TacomaBoy" <
[email protected]> wrote in message
| >
news:[email protected]...
| > | How can I tell if mine is top swing, etc etc. I know it isnt post
| moung,
| > it
| > | mounts to the BB. Does this limit the type of derailluers I can buy?
I
| > am
| > | looking into getting a new XT soon...
| >
| > Bottom bracket mounted derailleurs are referred to as "E" type
derailleurs
| > and IIRC all of them are considered top swing. Unless you have a frame
| that
| > requires this type of mount, they are not necessary. Generally, the
most
| > important issues in choosing a replacement are pull direction and clamp diameter. Measure (or
| > have somebody with calipers) measure the seat
tube
| > where the derailleur would clamp on. It should be close to 1 1/8 inch,
1
| > 1/4 inch or 1 3/8 inch.
| >
| > If you plan on using small rings (up to 44 tooth) a top swing model will work okay. Larger
| > rings, you need (but not necessarily require) a
bottom
| > swing (high clamp - I've gotten low clamped Top Swing models to shift 48 teeth dependably)
| >
| > You may need a washer to take up the space created by taking off the BB mounted model.
| >
| > All of this goes out the window if the frame won't allow a clamp type
der.
| >
|
| Thanks for that, very helpful. I believe my bike NEEDS a BB mount, since
it
| has an odd shaped, frame (2000 Rockhopper FSR). Top swing means the hinge is on top, correct? If I
| bought a topswing with, say, a 1 1/8" mount,
could
| I take the mount off and attach the derailleur to the BB mount?
|
|
Top swing actually means the pivots are BELOW the cage. I think the FSR would allow some clamped
models, but stitching the mechanisms isn't as easy as it sounds. Some of the pivots are riveted
instead of e-clipped. If you stay with the E type, then use the XT for up to 44 tooth big rings and
the XTR for anything larger.
---
__o _`\(,_ Cycling is life, (_)/ (_) all the rest, just details. Nelson Binch =^o.o^=
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