Rear derailleur problem

Hail 2 Da Thief

My SRAM Rival Rear derailleur took a little knock which has screwed up its settings a bit.
The chain is now grinding when on particular casette rings.
I've put the chain on the large front chain ring, ran through the gears & adjusted the barrel tension to make the gear changing smooth.
But when I drop the chain to the small front chainring & run through the casette it grinds when on the 3 large casette rings.
I've also checked the L,H & B screws which seem fine.
Any advice on how to fix this? This mechanical stuff is all new to me

E@gle.

It could be just your derailler drop out on frame. They can bend pretty easily.

Morgan

Yeah, your dropout might need to be realigned. A tool like this is used to do it properly:

http://www.parktool.com/products/detail.asp?cat=48&item=DAG-2

Probably a job for the shop unless you fancy bending it randomly by eye.

Hail 2 Da Thief

Yeah I had looked at the dropout to see if it was bent but didn't see any major bending.
Maybe it's just not visible to my untrained eye!

Probably a job for the shop unless you fancy bending it randomly by eye.

How can I bend it back? By pushing the derailleur away from the bike?

Morgan

Well, you can just grab the bottom of the derailleur cage and start bending. It should be vertical. 10-speed road setups are probably quite finicky so you might do more harm than good.

ednwireland

i thought mine was straight until i bought an alignment tool, it was out in every direction imaginable got a cheapie one on wiggle which did the job
if you have a replaceable dropout (i didnt) just replace the dropout

Murph100

NOOOOOOO !!!!! :eek:

You'll bend the derailleur and have to replace that too.

Best bet is to order a new dropout, cheaper than getting a tool to straighten it, and then you know its straight.

I wouldn't advise trying to straighten it yourself with a pliers etc as it will probably break ( speaking from recent experience here !! ).

Bottom line, order a new one, and leave your current one alone until you get it, trust me, a week off the bike because of a €12 piece of aluminium is a right p!sser.

Hail 2 Da Thief wrote: »

Yeah I had looked at the dropout to see if it was bent but didn't see any major bending.
Maybe it's just not visible to my untrained eye!



How can I bend it back? By pushing the derailleur away from the bike?

Hail 2 Da Thief

ednwireland wrote: »

if you have a replaceable dropout (i didnt) just replace the dropout

Yeah I took out the rear wheel to look at the dropout & it's replaceable.

Murph100 wrote: »

Bottom line, order a new one, and leave your current one alone until you get it, trust me, a week off the bike because of a €12 piece of aluminium is a right p!sser.

Yeah I'll just order a new one & replace it. A quick google lead me to this which appears to be what I need.


Thanks for the advice lads. I'm just glad I now know what the problem is as it was driving me crazy!

E@gle.

I just replaced mine this site is good to find out which one you need, i then just ordered mine on CRC, cost about €20 i think.