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SRAM x.9 rear der pulley/jockey wheel direction

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SRAM x.9 rear der pulley/jockey wheel direction

Old 07-28-14, 01:19 PM
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SRAM x.9 rear der pulley/jockey wheel direction

So on my x9 rear der, the lower pulley has a directional arrow but the top one doesnt. Does it matter which direction I install the top pulley?
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Old 07-29-14, 05:01 PM
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Anyone?
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Old 07-29-14, 05:12 PM
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Can't swear about Sram, but here's what to look for.

Most upper pulleys have some float, and some are asymmetrical (or were), so right/left orientation mattered. If the pulley looks symmetrical, than right/left won't matter.

I have no idea why the lower pulley would have an arrow except if it's a clutch pulley intended to reduce chain bounce. If so, you need to follow the arrow. You might test the upper in your fingers to see if it spins easier one way than the other just to make sure it doesn't.
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Old 07-30-14, 10:34 AM
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Will check, thanks for reply.
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Old 07-30-14, 10:36 AM
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On my SRAM gears, there is no diff on the top pulley with respect to rotation and they're symmetric. The bottom pulley has shaped teeth to help guide the chain over the varying angles it approaches from the front so the sharp leading edges should be toward the front at the bottom of the pulley. There are arrows on the bottom pulley to indicate correct orientation.
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Old 07-30-14, 10:52 AM
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One other note on the subject.

If a company marks a direction on a product (any product) and you have no valid reason to disregard, then best course of action is to follow suit (even if you don't know the reason).

Also, if a company marks one item with an arrow (for whatever reason) but not another in the same family (ie 2 pulleys on the same RD) then it's fairly safe to assume that if they had a preference for the other they would have marked it too. It's not logical to think that a company would only mark the direction on one part if both were directional. Of course all bets are off when not dealing with original equipment.

My point here, is that very often, the parts themselves answer many questions if you simply give it a bit of thought. Part of being a good mechanic is developing the ability to read the parts involved and infer the maker's intent from them.
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