8 speed derailluer

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8 speed derailluer

Postby ukalipt » Tue Mar 04, 2008 1:41 pm

hey all,
i am looking to possibly upgrade my back derailluer. it is slightly bent
[i have straightened it manually] but was wondering if there is a better
quality 8 speed i can get.
currently i am running a Shimano Alivio 24 Speed, RD-M410.
i could buy the the same but is it possible to upgrade?
most upgrades seem to 9 speed so i would need to upgrade
the shifters as well yeah? and obviously the cassette.
the shifters are Shimano ST-EF35 EZ-fire plus

any help would be really appreciated
i like to pedal
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by BNA » Tue Mar 04, 2008 2:07 pm

BNA
 

Postby Bnej » Tue Mar 04, 2008 2:07 pm

You can use a "9 speed" rear deraileur on an 8 speed casette with 8 speed shifters no problems. The indexing is done by the shifters and as long as the deraileur is the same brand then it will be pulling the same amount of cable.

If you want to change to a 9 speed cassette in the future then you need to change shifters, but you can use the same deraileur.

Most of the "feel" of the shifting is in the shifters, so while a better one might improve shifting a bit, it won't make as big a difference as upgrading shifters.
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Postby ukalipt » Tue Mar 04, 2008 2:31 pm

thanks Bnej. thats great
we need to do a ride shortly as well.
i'll hit you up once i work out what i have on over the next few weekends, if your up for it
i like to pedal
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Postby toolonglegs » Tue Mar 04, 2008 2:35 pm

Hi Ukalipt,
I have an old 8 speed XT one lying around.Needs a clean but is in good nick.Has alloy jockey wheels.All it needs is the tab that holds the cable in place,you could use the one of your old one or I probably have one lying round.
$15 total including postage.
Cheers Ian.

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Postby Bnej » Tue Mar 04, 2008 8:53 pm

ukalipt wrote:thanks Bnej. thats great
we need to do a ride shortly as well.
i'll hit you up once i work out what i have on over the next few weekends, if your up for it


Sure, drop me a PM. Next weekend I have loads of riding booked already (75km MTB ride Friday, 30km Saturday, 85km Loop the Lake Sunday), but after that ought to be okay.

What kind of riding do you want to do?
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Postby ukalipt » Tue Mar 04, 2008 9:24 pm

ian, i will take a raincheck for now. i still may go something a bit more upmarket. if not i will PM you to see if you still have it hanging around.
thanks for the offer anyway!

benj, best for me is a MTB. possibly narrow neck or butterbox? i will PM you next week.
i like to pedal
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Postby Hawkeye » Wed Mar 05, 2008 10:00 am

Ukalipt, Alivio is crud, suitable for very occasional off-road and intermittent bike path use only, and will suffer if used for everyday commuter duty. I think you would do well to upgrade it. Deore is the minimum level in my view.

WRT your comment about bending and straightening the unit, it is usually the replaceable aluminium mount (aka derailleur hanger) that bends rather than the DR. These are usually made from a softer alloy than both the frame or DR unit and are designed to be a sacrificial part in the event of a major hit. Mine gets bumped from time to time.

I straighten it by inserting a long allen key of suitable size into the socket of the pivot where the DR mounts onto the hanger, and bending until the chainline through the pulleys is vertical again when looking from the rear. Try not to apply force to the rest of the DR unit unless there is an obvious fault.
Hawkeye
 

Postby anthonyje » Wed Mar 05, 2008 4:20 pm

hi uka
the offer of a shimano XT rear der is a good one - it appears a loooong way north of the Alivio on the pecking order. Made to last and perform well for a long time. $15 (incl post!) is a deal, even though it needs a bit of a spruce - RRP for a new one is around 100.
Ant
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Postby ukalipt » Wed Mar 05, 2008 9:37 pm

man. i'm such a noob to MTB stuff. after doing some more re-search i realised it is an awesome deal. my bad. thanks anthony for pointing that out.

toolong - will pm'd you shortly

hawkins, i know alivio isn't the best but being honest i have put almost almost 900km of descent rugged terrain on the alivio and it has widthstood everything i have thrown at it, apart from the time i fell directly on to it and bent it. i can't fault it, only me.
i like to pedal
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Postby Hawkeye » Thu Mar 06, 2008 5:09 pm

Uka, I appreciate your comments. My son's mtb has alivio on it as well. It can be OK but you need to treat it kindly to get any kind of decent life out of it.

Your experience with landing on it isn't uncommon in mtbing. I'd also say that while 900km is a good distance it isn't that much over the life of the bike. Where the more expensive componentry distinguishes itself is in longevity and abilty to cope with heavy and/or clumsy riders. I'm in both categories.

You'll find with the cheaper bits that they wear faster, lose their crispness and accuracy earlier, and have a lower abuse tolerance than the better engineered components, and where you notice it most of all is in the shifters and front DR.
Hawkeye
 


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