Expecting too much?

[colcazal]

Hi,

Went for a quick spin on my new bike today!

The problem is, I am getting some front mech chain rub in a few gears on both chain rings. The bike has Ultegra SL components and to be honest I was not expecting any chain rub what so ever (maybe slight on excessive cross over) Am I expecting too much??

I pointed this out after my test ride at the shop (evans) They said they would adjust, but to me it is still the same!!

The bike goes back for a service in a few weeks and I will obviously let them know about this issue! Am I being picky??

Cheers,

Col

 

[jayce]

I adjust mine so when in top cog in the rear it just misses the inside of the mech so when you go down the cogs it should not rub ,i use 6 or seventh gear then change to top cog ,but if you fiddle for a while you will get it ,if it rubs adjust it so that there is more tension on the cable then it will move up or vise versa, hope this makes sense

 

[colcazal]

Ta for that!

A rubbing front mech is my pet hate!! I can live with it on my triple but a brand new bike with a double. Nah. Going to go back to the shop. I feel any mechanic who spends that wee bit more time should get it perfect.

Cheers,

Col

 

[spence]

Cross ringing will always give you chain rub to sum extent. Typical of Evans to say they can adjust it out. Keep off the big cogs on the big ring and the small cogs on the small ring.........

 

[TheDoctor]

Or big to big for that matter.

 

[RedBike]

Extreme ratios will always rub. However, I think Ultegra SL has a trim function. You can move the front mech just half a position. This should allow you to access all the gears without the chain rubbing.

However, combinations that cause the chain to rub the front mech are probably best avoided.

 

[GrahamG]

However, I think Ultegra SL has a trim function. You can move the front mech just half a position. This should allow you to access all the gears without the chain rubbing.

Thought I'd just emphasize this point - the Shimano front mech trimming is not obvious if you've never used STi's before. It is literally just a very gentle 'half-way' dab on the inner lever. Try it out on a quiet bit of road first so you can watch the front mech and get a feel for it.

 

[Tynan]

I got double and on the big chain wheel at least I can do every cog without any noticeable issue at all

 

[jimboalee]

The pillock at Evans MIGHT have adjusted it - ON THE WORK STAND - but in the real world, the B/B will flex and you might get some clashing of the chain on the mech plate.

Especially on the big ring when the chain is on the smallest sprocket.

You just have to take a small screwdriver for a spin round ( giving it some wellie ) and adjust when you hear a clatter.

 

[e-rider]

it's all been covered except checking the height of the front mech - too high will cause trouble.

With correct adjustment AND trimming you can avoid rub in ALL gears.

But like people have said - avoid big and big; small and small gears anyway - but if you're a perfectionist, you should be able to get these gears without rub - just don't use them often!

 

[colcazal]

it's all been covered except checking the height of the front mech - too high will cause trouble.

With correct adjustment AND trimming you can avoid rub in ALL gears.

Exactly what I think!! It looks like a height and angle issue which I will point out when the bike goes in for its safety check.

I really do not see why I have to fiddle with it when I have forked out plenty for the bike!

Cheers,

Col