Dunbar

The right shifter on my 5700 105 bike has a problem that has been slowly getting worse (currently has about 13k miles.) When you click the brake lever to downshift sometimes you get the double-downshift no matter how gingerly you try to downshift one gear. The RD only shifts once so it's pretty annoying to keep having to click up once after the inadvertent double downshift. I had the same issue with the 9000 polymer cables as the current PTFE ones so I'm pretty sure it's a shifter issue (the polymer cables literally required half the force to downshift.) It used happen maybe 1/10 shifts but now it's more like 3-4/10 shifts it happens and in the drops it's even more frequent.

Since the shifter is not obviously "broken" do I have any shot at getting a warranty replacement?

Edit: Update 10/2 I mailed the failing shifter to Shimano's warranty dept along with the warranty form posted on their website and I had a brand new shifter free of charge 1 week later.

mconlonx

Only if it's less than a year old.

Al1943

I doubt that the shifter is broken. There are other possibilities that could cause your problem. Have you tried adjusting the shift cable at the barrel adjuster? If not try a 1/2 turn clockwise to move the upper pulley slightly outward. Is there any chance that the derailleur hanger could be bent? Have you tried flushing out the shifter with WD40? I doubt that will fix it but it won't hurt to try.

Dunbar

I'll try cleaning it out with WD40. I don't think it has ever been cleaned.

The bike shifts perfectly (in both directions BTW) if you can get it to click once. It indexes fine (no skipping/stuttering) so I'm pretty confident it's a shifter issue and not an RD issue. I don't see how adjusting the cable tension would change anything. Cables/housings are only 2/12 months old.

Wilfred Laurier

warranty on shimano components
is two years
except for dura ace and xtr
which have a warranty of three years

Warranty

Dream Cyclery

Not if he got the parts from a new bike purchase. OE warranty is 1year.

mconlonx

Is it tune? Or is it warranted?

More info needed from OP...

Dunbar

I don't know what this means. The 105 group set came installed on a new bike I purchased 1 1/2 years ago.

RoadGuy

What he is trying to say is: Is the shifting problem an adjustment problem, or a defective part.

Have you had the bike tuned up by a bike shop, or at least had a shop try adjusting the rear derailleur cable tension and travel limits?

In many cases when you buy a new bike from a bike shop, the original owner gets free tune-ups on the bike for the lifetime of the bike.

Dunbar

I moved away from the area I bought the bike from but my local shop replaced the housings/cables in May and tuned it up. I believe it's something with the shifter because I've fine tuned the barrel adjuster so it shifts perfectly (no skipping or stuttering and the limit screws are set fine as well.) Just the annoying double downshift click when you're only trying to click down one gear.

Wilfred Laurier

i left my last job in the industry about seven years ago
things may have changed since then
but shimano products that came on bikes were treated the same as those sold as retail

oe manufacturers of bikes with shimano parts
generally have a one year parts warranty
and will handle shimano warranty claims within that period
but outside of oem warranty
shimano still supports two or three years from dop of the bike

this was my experience anyway

zacster

If it is still under warranty it probably isn't worth the hassle anyway. Bring it to a shop and explain what it is doing and have them look at it. It probably just needs adjustment. The tolerances on these things is pretty tight, so while it may look right, it doesn't take much for it to be out of spec. Also, someone else already said it, is the hanger bent? It doesn't have to be visibly bent to be out of alignment. I have the alignment tool, and it really makes a difference to get that right. All the noise goes away, all the shifts are smooth. I've used it a second time on one bike and was surprised to see it was out of alignment again even though I don't remember banging it.

mconlonx

Bring it to a shop which deals with the brand of bike you got. Then, as zacster says, have them take a look at it and potentially diagnose. The double shift doesn't sound like a bent der hanger issue, but what the heck, have them check that, too. If everything else checks correct, ask if they will submit a warranty claim through Shimano.

With Trek, warranty is one year on non-Trek components. Your brand may differ and it's worth asking. Even if it is out of warranty coverage, if you move to a new place and present as a new potential customer, the shop may still go to bat for you with a warranty claim, and even if warranty coverage is only one year, Shimano may still cover it.

My experience is that Shimano is more of a stickler for warranty terms than SRAM...

achoo

13,000 miles?

Original cables?

Make sure the cable isn't frayed inside the shifter.

Dunbar

As I mentioned, the cables were replaced in May.

Dunbar

Just wanted to bump the thread to let everyone know you can interface directly with Shimano's warranty department. I mailed the failing shifter to Shimano's warranty department along with the warranty form listed on their website and I received a brand new shifter free of charge 1 week later.