suntour / shimano problems

cchris2lou · Oct 1, 2006

I have put gears bakc on the M2 using a XTR 9 speed rear mech and suntour XC pro thumbshifters . the shift great but when on the last 5 sprockets the chain goes back dwon on its own . basically the thumbshifter just go down a gear , then 2 , then 3 etc....

I had to hold the thumbshifter all along the hill to stay on the same gear . I even broke my chain .

What shoud I do ?

Stick Legs · Oct 1, 2006

again!

I keep on about this but...
Try putting the inner cable on the wrong side of the clamp bolt, this changes the pull / swing ratio of the mech (think levers and fulcrums).

See www.sheldonbrown.com

hope this helps.

cchris2lou · Oct 1, 2006

I have done it and it shifts fine but , the thumbshifter does not stay in place and starts to come down .

Elev12k · Oct 1, 2006

Chris,

You already adjusted the rotation smoothness with the screw on top the shifter??

cchris2lou · Oct 1, 2006

melvin ,

that is the next thing I am going to try , and get a longer chain .

thnkas for the tip .

terryhfs · Oct 2, 2006

Shimano / Suntour

The clamp reversal trick only works Shimano <> Campag. Suntour were notorious for their incompatibility even between their own components. Chain breakage was common with Suntour and each groupset kind of needed its own specific chain.

It's one of the main reasons for Suntour's downfall as you couldn't upgrade individual parts, you have to do the whole drivetrain at once, unlike - say - sticking an XT mech on a Deore eqiuipped bike.

That said, if your shifter is moving on it's own, it's either broke or not done up properly.

Terry...

cchris2lou · Oct 3, 2006

On the Sheldon site , he says that autoshifting is due to the cable guide under the frame being blocked or not greased properly .

But I am starting to thing that my shifter is a bit tired as it moved down when I pulled on the cable from under the frame . Is it normal ?

Stick Legs · Oct 9, 2006

No, not normal at all :shock: Suspect that your shifter is truly w*nked.

Don't know what to suggest, there are enough early 90's XT bits for sale

cchris2lou · Oct 9, 2006

actually , it works fine now .

put some grease on the plastic bit under the bb , changed the top jockey wheel et VOILA !

except that i keep breaking my chain . but I think it is because I use a 9 sp chain with a 8 sp cassette . Just bought a 8 sp chain so we ll see .

dont like the feel of XT thumbies , just love the Suntour ones .

suntour / shimano problems

cchris2lou

Stick Legs

cchris2lou

Elev12k

cchris2lou

terryhfs

Senior Retro Guru

cchris2lou

Stick Legs

cchris2lou

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