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Shimano twist shifters

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axem Offline
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Posts: 3
Joined: Apr 2011
Post: #1
Shimano twist shifters
Hiya,

I've got a MTB with shimano SL-RS30 twist/grip shifters. I've taken them apart as per your video and lubricated the cable. I've also dripped bike oil into the shifter housing as suggested.

In slot 6 its fine, but downshifting to 1 is almost impossible, very stiff and painful on the hands.

Do you have any suggestions on how to ease the twist action as its almost unusable at present.

PJ
Apr 17, 2011 07:52 AM
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painkiller Online
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Peoria, IL. USA
Posts: 1,354
Joined: Mar 2011
Post: #2
RE: Shimano twist shifters
start by checking your limit screw again


There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Apr 17, 2011 09:07 AM
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axem Offline
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Posts: 3
Joined: Apr 2011
Post: #3
RE: Shimano twist shifters
(Apr 17, 2011 09:07 AM)painkiller Wrote:  start by checking your limit screw again

Cheers painkiller, is the limit screw the "B" screw on the rear derailleur or part of the gear shift housing?

P
Apr 17, 2011 11:02 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,209
Joined: Jul 2010
Post: #4
RE: Shimano twist shifters
(Apr 17, 2011 11:02 AM)axem Wrote:  
(Apr 17, 2011 09:07 AM)painkiller Wrote:  start by checking your limit screw again

Cheers painkiller, is the limit screw the "B" screw on the rear derailleur or part of the gear shift housing?

P
on the derailleur, there are:
  • a high limit screw - to adjust the maximum travel of the derailleur towards the small (high) sprockets.
  • low limit screw - adjust the travel limit towards the wheel (large sprokets) - low gears
  • B- screw adjust the angle of the parallelgram of the derailleur
  • cable length adjustment.

I would completely disconnect the cable from the rear derailleur, make sure that cable moves freely when you shift, and the you can manually (and easily move) the derailleur from the High limit to Low limit. If everything is good, reconnect cable.

Nigel
Apr 17, 2011 01:41 PM
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painkiller Online
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Peoria, IL. USA
Posts: 1,354
Joined: Mar 2011
Post: #5
RE: Shimano twist shifters
As nfMISSO stated disconnect cable pull lightly with your hand and make sure it moves freely
if it does then I would suspect the low limit screw is stopping the derailluer just a smidge to soon
forcing you to torque hard on that gear to set the click
back it out about a 1/4 turn or so and see how that works


There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Apr 17, 2011 03:19 PM
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axem Offline
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Posts: 3
Joined: Apr 2011
Post: #6
RE: Shimano twist shifters
Heya both,

I've taken the thing apart again and still no closer.

There is no "B" screw on this model - I've even checked the shimano specs RD-TY18.

I'm at the point where the L limit is fully in and the gear is still on 6 (fully H) with no movement.

How do I know when the gear cable needs replacing? I'm wondering if thats what's causing my issue.

PJ
Apr 19, 2011 10:42 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,209
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Post: #7
RE: Shimano twist shifters
(Apr 19, 2011 10:42 AM)axem Wrote:  Heya both,

I've taken the thing apart again and still no closer.

There is no "B" screw on this model - I've even checked the shimano specs RD-TY18.

I'm at the point where the L limit is fully in and the gear is still on 6 (fully H) with no movement.

How do I know when the gear cable needs replacing? I'm wondering if thats what's causing my issue.

PJ

it is not clear that you completely disconnected the cable from the derailleur, put the bike on a stand or upside down, while rotating the pedals, then with your hand moved the derailleur over its full stroke.

Have you done this?

Nigel
Apr 19, 2011 08:24 PM
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