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Shimano Ultegra rubbing(21 posts)

Shimano Ultegra rubbingdjgiant
Aug 8, 2003 1:52 PM
I just took my new full ultegra bike to the shop to find out why when in the smaller of the double chainring, and the last four cogs, the chain rubs on the large chainring. The shop guy says he called Shimano tech, who says it's normal for 105, ultegra and dura ace to do this. Has anyone had this experience?
Yeah, it's fairly common.Spoke Wrench
Aug 8, 2003 3:13 PM
The quick, dirty fix is to install a 2mm spacer behind the bottom bracket to sweeten the chainline. That's what I did with my Klein. A more elegant but much more expensive alternative is to install an XTR bottom bracket.
OR....Holden_1
Aug 8, 2003 4:23 PM
you could have bought Campy to begin with. That would have saved you a lot of trouble in the long run.

Has anyone else noticed that every post about Ultegra goes on to describe some sort of problem?
I thought about switching to Campy.Spoke Wrench
Aug 9, 2003 11:05 AM
I was afraid that if I did it might cause me to turn into an elitist snob.
Instead you're....Holden_1
Aug 9, 2003 1:32 PM
an idiot whose chain rubs. Good choice. Don't worry, when your front derailleur dies it'll only cost what, $15 or so?
What's the front derailleur have to do with it? (nm)Spoke Wrench
Aug 9, 2003 2:19 PM
re: Shimano Ultegra rubbingdivve
Aug 8, 2003 7:13 PM
I don't know about Ultegra, with Dura Ace however you can trim the position of the front derailleur to prevent rubbing. Simply apply the up shift lightly without actually shifting to another ring. Also, make sure that the lower end point of the front derailleur isn't set too far to the inside. It only has to be around 0.5mm from the chain when you're on the lower chain ring and most inside rear cog.
The poster is not talking about derailleur rubbing (nm)Al1943
Aug 8, 2003 7:49 PM
yeah I just realized that now:) nmdivve
Aug 8, 2003 8:09 PM
Common but not normal.Al1943
Aug 8, 2003 8:02 PM
Sounds to me like quality control because several people have reported this problem while most Ultegra riders have not had the chain ring rub problem. As Spoke Wrench said, a spacer is often used to correct the chain line. I have not heard of this problem with any other Shimano group.

You should check to see that the inner ring is not reversed. With Shimano the tooth count stamping on the big ring should face to the right and on the inner ring (or middle ring) should face to the left. Reversing the inner ring will also cause the type of chain rub you have described, I've seen this happen more than once.
~Al
Ring okdjgiant
Aug 9, 2003 6:31 AM
I've checked the ring orientation, and they seem to be ok. I know it's not a problem on all ultegra bikes, as I have a friend who's bike only rubs the derailure (slightly) in the small, small combo. It appears it's buyer beware. Just one more thing you have to look for in buying a bike. Paid $3.000 for a bike and have to pay additional $$$ for shimano's QA woes.
re: Chainstay lengthMike Prince
Aug 9, 2003 9:14 AM
The reason that it is not reported on every Shimano bike is that chainstay length plays a major factor in this as well. The shorter the chainstay, the higher deflection angle of the chain. So some bikes do not have the problem.

I am not disagreeing that it is a problem, just explaining why it happens on some bikes and not others. My approach was to use the XTR BB on an otherwise D/A set up. Works OK. Another solution is to use a bigger small chainring (42t). When I had the problem, the longer BB helped some and the bigger chainring eliminated the rest.

Obviously the bigger chainring is not a great solution - I happened to find this because the airline managed to mangle mine in-transit and the only replacement I could find quickly was a 53/42 combo. I was in the UK so this was not a huge concern as it was not too hilly. Now I am back home in NC and need a 39 for the mountains - I have learned not to 'cross chain' and rubbing is no longer an issue.

Mike
re: Shimano Ultegra rubbingLLSmith
Aug 10, 2003 2:25 AM
It's not normal to rub the big ring on the four smallest cogs. It should only be rubbing on the two smallest cogs.You also put extra stress on your chain if you use these cogs on a regular basis.Back to the shop for an adjustment.
re: Shimano Ultegra rubbingdjgiant
Aug 10, 2003 4:42 AM
The shop has sent me away saying that this is a normal occurence and there's nothing they can do, I believe the last word was "sorry". The fix, if any, is on my dime.
re: Shimano Ultegra rubbingtarwheel
Aug 11, 2003 6:29 AM
With my Ultegra group, the chain rubs the big ring while in last three rear cogs. I've had this group on 3 different frames with varying chain stay lengths, and it's rubbed on every one. I've just learned to shift to the big ring when it starts rubbing. My LBS also said it's normal for Shimano and got kind of pissed at me when I kept pressing the issue. I haven't tried the 2 mm shim on the BB yet but will probably give that a shot if I ever have to replace it.
No WayChen2
Aug 11, 2003 6:36 AM
The chain should never rub the big ring when running on the inside ring. That's BS.
Way (nm)Spoke Wrench
Aug 11, 2003 7:38 AM
Well, it's common as all get out, and I don'tOldEdScott
Aug 11, 2003 8:15 AM
know how any 'adjustment' can fix it. If you look at the problem just visually, you instantly just say: "Wow, if everything would just move to the right a couple of millimeters ..."

That's where Spoke's 2 mm spacer comes in. He advised me to do it, and it worked great.

If anything, Shimano is guilty of bad spec on the width of their Ultegra BB
Agreed, common not normal. Shimano's problem (nm)Chen2
Aug 11, 2003 8:30 AM
re: Shimano Ultegra rubbingdave woof
Aug 11, 2003 1:37 PM
Look at it this way.

If you bought a car - say a five speed manual, and the dealer said - 'you can't use 3rd gear, because of transmission rubbing' you just have to jump from 2nd to 4th - would this be acceptable?? It's no different.

Shimano could easily solved this problem. They are just lazy and didn't want to pay for retooling when this was discovered.

After too many Shimano parts failing - i.e. Broken left Ultegra crank. (2) failed right ultegra shifters. Failed left Dura Ace shifter. (That's only in about 1 year).

I am moving (back) to Campy when I can afford it.

Dave
re: Shimano Ultegra rubbingkg1
Aug 12, 2003 9:59 AM
I Had this exact same problem on my Gunnar Roadie. I didn't really even like the bike for a while -- felt like I'd made a mistake with the purchase. Why 18 speeds when about 6 are unusable? That's a 10 speed. Thought it might be frame alignment, but it wasn't.

The fix was a Dura Ace BB and a 2 mm shim on the drive side. Now, I only get rubbing on the last two cogs. Not great, but much better than losing the last 4 to rattles. At the shop I bought my bike (Ben's in Milwaukee), the fix was on their dime. Seems to me, your shop should do the same.

By the way, when I posted this problem, I got a lot of responses saying that it's a common occurence, and if you were to do a search, I think you'd find a lot of other posts listing this same problem.

Aside from this problem, it's hard for me to imagine a better functioning group, or a better bike. I love the Gunnar and the Ultegra set-up (but haven't ridden Campy -- don't want to fall in love when I'm already married).

Good luck.

kg1