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Post by ady on Feb 6, 2011 9:55:22 GMT
My Sram X9 derailleur arm has started sticking when I change down to get into a smaller cog nothing will happen I have to knock the arm to get it to work, the cable is quite new so doubt it that what could be the other likely causes spring or something maybe?
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Post by Oggy on Feb 6, 2011 10:26:51 GMT
Almost definate its shite in the cable, i know you say the cable is new but all it takes is a little bit of grit to get in there, Undo the cable, take the outer cable off, wiper down the inner cable and give it a spray with gt85 or similar and blast some gt85 down the outer cable. If that doesnt work then it is the spring in the mech, i had a new one once that wouldnt shift down properly, i sent it back and they sent me a new one. You can tell ifs its a spring problem by taking the mech off the bike and seeing how much tension is in the spring by hand. My best bit of advise is to chuck it in the bin and buy an shimano mech and shifters  |
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Post by thistle on Feb 6, 2011 13:38:53 GMT
If the outers are full of crap you might not be able to clear them with GT85 and it might be easier to just buy new outers.
It could also be crap in the derailleur pantograph, but you would normally notice that straight away.
Also check the bolt between the mech and the hanger hasn't worked loose, and the one from the hanger to the frame.
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Post by ady on Feb 6, 2011 14:51:05 GMT
Thanks guys will give your suggestions a go!
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Post by Dan B on Feb 6, 2011 19:07:54 GMT
Have to agree with Oggy, I sold off my X0 stuff as I was sick off it jumping and sticking, bought XT throughout cheap and cheerful and great performance ..........Priceless  |
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Post by ady on Feb 6, 2011 21:00:09 GMT
Ok if I decided to change to shimano there are quite a few versions of Shimano XT Rear Derailleur M770, M771 & M772 is there much of a difference apart from price, also what XT shifters or are slx as good?
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Post by Oggy on Feb 6, 2011 21:23:37 GMT
772 rear mech if your sticking with 9 speed www.merlincycles.co.uk/Bike+Shop/MTB++Parts/Transmission++Gears/Derailleurs+-+Rear+MTB/Shimano+XT+Shadow+rear+mech_990.htmas for shifters, the slx look very similar to the xt, prob not a lot of diffrence, if you buy either of them then take the shift windows off then you can get you brake levers mounted nicely inboard What casette are you using as i had a redwin sram cassette that went tits after a couple of rides causeing massive shiftering problems so that could be another thing that needs looking at. Although i did like the way sram shifted it just gave me no end of durability problems and now im back on shimano i actually prefer the lightness of the shifts compared with the sram |
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Post by ady on Feb 6, 2011 22:29:17 GMT
772 rear mech if your sticking with 9 speed www.merlincycles.co.uk/Bike+Shop/MTB++Parts/Transmission++Gears/Derailleurs+-+Rear+MTB/Shimano+XT+Shadow+rear+mech_990.htmas for shifters, the slx look very similar to the xt, prob not a lot of diffrence, if you buy either of them then take the shift windows off then you can get you brake levers mounted nicely inboard What casette are you using as i had a redwin sram cassette that went tits after a couple of rides causeing massive shiftering problems so that could be another thing that needs looking at. Although i did like the way sram shifted it just gave me no end of durability problems and now im back on shimano i actually prefer the lightness of the shifts compared with the sram Thanks Oggs, shool of thought on slx is that the quality doesn't look as good (plasticy) but performance is good, glad its the 772 as its the cheaper option, will check my cassette but think its an sram one, probably need to change my chain too. |
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FoZ
Grunt
Posts: 47
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Post by FoZ on Feb 24, 2011 14:37:57 GMT
It's happening to me now. Jesus, why do they make such crap stuff?
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Post by joncarre on Feb 24, 2011 19:46:06 GMT
I quite like the SRAM gear. I had a slight shift problem, but gave the mech joints themselves a short blast of gt85 and it cleared it up.
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Post by joncarre on Feb 24, 2011 19:54:15 GMT
OK I have a question about rear mechs. What is the difference between the short cage and the long cage? |
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Post by Dan B on Feb 24, 2011 19:58:10 GMT
OK I have a question about rear mechs. What is the difference between the short cage and the long cage? It's the amount of teeth it can handle in the ratio between the chainring and the cassette. |
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Post by Dan B on Feb 24, 2011 20:04:55 GMT
Cage length
The distance between the upper and lower pulleys of a rear derailleur is known as the cage length. Cage length determines the capacity of a derailleur to take up chain slack. Cage length determines the total capacity of the derailleur, that is the size difference between the largest and smallest chainrings, and the size difference between the largest and smallest sprockets on the cogset added together. A larger sum requires a longer cage length. Typical cross country mountain bikes with three front chainrings will use a long cage rear derailleur. A road bike with only two front chainrings and close ratio sprockets can operate with either a short or long cage derailleur, but will work better with a short cage.
Manufacturer stated derailleur capacities are as follows: Shimano long = 45T; medium = 33T SRAM long = 43T; medium = 37T; short = 30T
Benefits of a shorter cage length:
* more positive gear-changing due to less flex in the parallelogram
* better gear-changing with good cable leverage
* better obstruction clearance
* less danger of catching spokes.
* slight weight savings.
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Post by joncarre on Feb 24, 2011 20:35:29 GMT
Cheers for the explanation Dan. That makes it clear.  |
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FoZ
Grunt
Posts: 47
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Post by FoZ on Feb 25, 2011 18:06:34 GMT
So what do i need to replace my dérailleur with a reliable one?
I have a Specialized Enduro Comp 2010
I have SRAM X7 shifters
SRAM X9 9 speed Dérailleur medium cage
My Cassette is Shimano HG61, 9-speed, 11-34t
Do I need to change my front dérailleur too? That is working perfectly
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