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Help: chain tension problem?

749 Views 7 Replies 4 Participants Last post by Bubba74, Jul 1, 2009

mikkelz

Discussion Starter · Jun 30, 2009

Hi guys

I'd really appreciate it if someone would be able to assist me, before I resort to taking my bike down to my LBS to get fixed.

I took my chain off yesterday to clean it and left it off overnight. I just recently put the chain back together (SRAM powerlink) and noticed that when I am in the small chain ring at the front and about 7th gear at the back, the underside of the chain starts to touch the top of the two jockey/pulley wheels. It's almost as if tension has been lost.

Any suggestions as to what the problem may be? I haven't adjusted anything.

I've attached a picture to try and indicate the problem I am having.

Thanks in advance!

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shiggy

· #2 · Jun 30, 2009

mikkelz said:
Hi guys

I'd really appreciate it if someone would be able to assist me, before I resort to taking my bike down to my LBS to get fixed.

I took my chain off yesterday to clean it and left it off overnight. I just recently put the chain back together (SRAM powerlink) and noticed that when I am in the small chain ring at the front and about 7th gear at the back, the underside of the chain starts to touch the top of the two jockey/pulley wheels. It's almost as if tension has been lost.

Any suggestions as to what the problem may be? I haven't adjusted anything.

I've attached a picture to try and indicate the problem I am having.

Thanks in advance!

Normal. Don't use the small ring and smaller cogs.

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mikkelz

Discussion Starter · #3 · Jun 30, 2009

Thanks for the reply, but it didn't do that previously.

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shiggy

· #4 · Jun 30, 2009

mikkelz said:
Thanks for the reply, but it didn't do that previously.

I bet it did. The only ways it could have changed are if you lengthened the chain or mis-routed the chain through the derailleur.

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stduoo7

· #5 · Jun 30, 2009

if you wanna know if the chain lenth is ok is to put the chain on big ring and big cogs without route the chain in the derailleur and ad 2 link's

http://bicycletutor.com/calculate-chain-length/

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Bubba74

· #6 · Jul 1, 2009

Looks normal to me. You shouldn't be using smaller cogs and the small chainring for that very reason. The rear derailleur can only make up so much chain with a wide range of gears.

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mikkelz

Discussion Starter · #7 · Jul 1, 2009

Thanks for the replies guys. I could've sworn I never noticed this before and I am sure I've ridden in 7/8/9 and the first chain ring. I definitely won't be doing that again!

Another lesson learned... :thumbsup:

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Bubba74

· #8 · Jul 1, 2009

mikkelz said:
Thanks for the replies guys. I could've sworn I never noticed this before and I am sure I've ridden in 7/8/9 and the first chain ring. I definitely won't be doing that again!

Another lesson learned... :thumbsup:

The smallest cog I go in in the granny ring is the fifth. Keep in mind that as a derailleur gets older, the springs can get worn which might account for a little tension loss, but your setup looks normal.

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