Chain Issue

[themosquitoking]

Im not sure I understood everything you said, but I think your very close to the truth, in particular the rear derailleur bit.

Got it in the bike stand and adjusted the L screw until the gear changing became a little erratic at that end, then turned it back in a little so it was changing smoothly through all the gears.

Then when I moved the pedals backwards the chain jumped 2 cogs at the rear. I moved the pedals forwards again and it resat back in the outer cog. I could replicate this everytime. It only happens when my chainring is the big cog, and the cassette is the largest cog. When it is the smallest chainring and the largest cog in the casssette it freewheels backwards as normal.

So Im guessing when Ive been coming up to traffic lights in the big chainring and moved the gears down to the largest cog, while stationary I have moved pedal back ready to push off which has unsat the chain and when Ive pushed away with a little force it has jumped off the cassette...

Seem to have spotted the issue, but I hate messing with derailleurs and it looks like everything needs to be realigned or something.

Take it back to Evans and say it's only been like that since they had it.

 

[MaxInc]

That's basically what I tried to explain, english not being my 1st language sometimes I lack the vocabulary in technical discussions

It seems that the rear derailleur needs a bit of adjusting which is normal since the cable stretches in time. Before I attempt to fix this fault I would adjust the cable tension until all gears are shifted silky smooth on both chain rings with no hesitations on downshifts and no skipping more than 1 cog at a time. It may take a little time to make it perfect but it's not too difficult. When you think you got it right, take it out around the house to check if it's still smooth under load as sometimes you need fine tunning.

H and L adjusters you can do them visually while turning the pedals, you can see exactly when the chain is centered on fisrt and last cog.

Once you have these done, chances are your problem will be fixed as well. That being said, when using that particular gear combination, the chain is stretched at the maximum angle and it's is good practice to try to avoid the last 2-3 cogs when using the large chain ring as well as the fisrt few when on the small chain ring. Aparently this will also wear chain and cogs a lot less.

 

[themosquitoking]

TBH the day i need to replace a chain or cassette through wear will be a proud one.

 

[MaxInc]

Me too, not much concern with that since they are fairly cheap compared to price of cake every Sunday For me it is the irritanting sound of chain rubbing on the front derailleur that makes me choose a different gear combination, not much of an issue when I'm wearing headphones

 

[themosquitoking]

Me too, not much concern with that since they are fairly cheap compared to price of cake every Sunday For me it is the irritanting sound of chain rubbing on the front derailleur that makes me choose a different gear combination, not much of an issue when I'm wearing headphones

I took my bike back to the shop for it's six week shakedown ten days ago and they asked if there were any problems, i told them the chain rubbed slightly in the front mech when in the big ring and the smallest two or three cogs on the chainset. They fixed it so now it rubs on the front mech when i'm in the big ring and the largest two cogs on the chainset, i use them more than the small ones so now i wish i'd kept my mouth shut.

 

[Nomadski]

That's basically what I tried to explain, english not being my 1st language sometimes I lack the vocabulary in technical discussions

It seems that the rear derailleur needs a bit of adjusting which is normal since the cable stretches in time. Before I attempt to fix this fault I would adjust the cable tension until all gears are shifted silky smooth on both chain rings with no hesitations on downshifts and no skipping more than 1 cog at a time. It may take a little time to make it perfect but it's not too difficult. When you think you got it right, take it out around the house to check if it's still smooth under load as sometimes you need fine tunning.

H and L adjusters you can do them visually while turning the pedals, you can see exactly when the chain is centered on fisrt and last cog.

Once you have these done, chances are your problem will be fixed as well. That being said, when using that particular gear combination, the chain is stretched at the maximum angle and it's is good practice to try to avoid the last 2-3 cogs when using the large chain ring as well as the fisrt few when on the small chain ring. Aparently this will also wear chain and cogs a lot less.

Your english was fine, just my lack of understanding of gearing setup getting in the way. Will have a look at cable tension tomorrow. Thanks for the info Max.

 

[Nigelnaturist]

I took my bike back to the shop for it's six week shakedown ten days ago and they asked if there were any problems, i told them the chain rubbed slightly in the front mech when in the big ring and the smallest two or three cogs on the chainset. They fixed it so now it rubs on the front mech when i'm in the big ring and the largest two cogs on the chainset, i use them more than the small ones so now i wish i'd kept my mouth shut.

Obviously on the wrong chain ring.

 

[MaxInc]

Or use TRIM, as I just discovered, too much tension on the front mech cable prevented me from using this great feature No more chain rubbing for me