chain jumps
 

Hi, I'm riding a 9speeed diamondback. I've put some upgrades to it and I've found that my chain jumps quite abit when in certain gear configurations.
Here's my gears:

FrontD - DeoreLX M580
RearD - DeoreLX M580 GS
Cassette - 11-32t 9spd
Crankset - DeoreLX HollowTech M572 44t/32t/22t
Chain - SRAM PC-49

I've heard that maybe my chain is too long, but I've also heard that it maybe too short for some other mechanics. Tuning it don't seem to help.
So which is it?
Or this isn't the problem at all.
Please help...


:)

Ok.. I've noted down some of the problems.
I've labelled the gears to their numbers. The higher the number, the bigger the gear used.
The combinations that gave me problems are:

1) Front (3), Rear (8, 9) -- jumps
2) Front (2), Rear (1) -- chain burshed against front D
3) Front (2), Rear (2) -- slow in changing to (2), (2)
4) Front (1), Rear (8) -- chain burshed against front D
5) Front (1), Rear (3) -- chain burshed against front D

any solutions?

There was this great article I read last week about the proper shift pattern. I wish I could find it. Here's the gist. There is overlap between rear cog/middle ring ratios. You shouldn't be shifting the RD up through all 9 gears before moving into the middle ring. You should only go up to 3-4 in the rear before moving into the middle ring. Once you've gotten up to about 7 in the rear, then you can move into the big ring up front. With this technique, you may have to do a double shift; shifting down in the rear while moving up in the front. A rough rule of thumb that I use is that 3 gears on the rear is equal to 1 in the front. This technique keeps you from experiencing the condition that Raiyn described above. This should remedy conditions 1-4. Not sure about number 5. May be a FD adjustment? I can't get my visual aide to format correctly, but here's a pattern. I hope this helps.

Front Rear
small 1,2,3,4
middle 3,4,5,6,7
large 6,7,8,9