gear issues

shiznit76

Hi, been out on a new bike wee issue with the gears. All indexing fine apart from going on to smaller cogs at back from largest ones on big chainring at front. Don't seem to be going on to smaller rings too quickly, go from the smaller cogs to bigger cogs fine, but not big cogs to smaller ones. This happens on the four biggest cogs at back. When on small front chainring it moves fine, but not on bigger chainring, any suggestions? It is shimano 5800 11 speed set up

rowanharley

shiznit76 wrote:

Hi, been out on a new bike wee issue with the gears. All indexing fine apart from going on to smaller cogs at back from largest ones on big chainring at front. Don't seem to be going on to smaller rings too quickly, go from the smaller cogs to bigger cogs fine, but not big cogs to smaller ones. This happens on the four biggest cogs at back. When on small front chainring it moves fine, but not on bigger chainring, any suggestions? It is shimano 5800 11 speed set up

At that point, you really should be moving to the smaller chainring and coming down the cassette. All I know is that it's bad to be using your largest chainring with your smallest gears on the back.

cooldad

Rubbish, that is the right way to do it. ie. highest gearing. (He said smallest cogs, not lowest gears)

What you should not be doing is cross gearing, using small ring/small cog(s) or big ring/big cog(s).

Although it's worse on a triple than a double.

But I might be misunderstanding - the OP is a bit confusing.

StillGoing

There's no problem with cross chaining as long as you're not doing it for long periods for instance going up a short steep ramp where changing down to the inner ring and gears on the back will be more hassle than its worth. It is always best to keep as straight a chain line as possible though, not just for the life of the chain, but for less friction too. Modern group sets are designed to work with cross chaining.

Irrespective of the cross chaining issue, the gears should still work through the whole range. I'd disconnect the rear derailleur and give it a good clean up and check the cable inner and outer for friction. Sounds like there's either too much tension on the cable or something is sticking and releasing the tension (changing down) frees it up.

shiznit76

Hi o know I didn't explain issues very well, here is another try, when in 13, 14, 15, of 11 speed cassette, when trying go to next gear up, i.e 13 to 14, the derailleur does not seem to be going over quite far enough, its only in these three gears it is happening. Also, when going down I.e 14to 13 it seems work fine, is it a tension issue?
I've tried a different wheel and issue still there so can eliminate any issue with the cassette

cooldad

That's even more confusing.

But I would just slacken everything off and index properly from scratch.

lesfirth

Try turning the adjuster on the rear mechanism anti clockwise a quarter of a turn. Try it and do it again if needed. If you make a mess of it look on YouTube how to index your gears.
What bike did you buy.

shiznit76

lesfirth wrote:

Try turning the adjuster on the rear mechanism anti clockwise a quarter of a turn. Try it and do it again if needed. If you make a mess of it look on YouTube how to index your gears.
What bike did you buy.

Wilier GTR team, 105 groupset