Retrobike Forum Index

It is currently Thu Dec 08, 2016 7:32 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 6:59 pm 
Old School Grand Master
User avatar

Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
Posting this here even though it's modern kit because it's fitted to my '92 Saracen frame and hoping someone can offer the sort of advice that doesn't involve a lump hammer!

Building up my red 'Wot' today I've encountered a problem that has resisted all my efforts so far to resolve :facepalm:

The drive train is '92 LX, SRAM 9-speed cassette, and SRAM X-7 shifters; now the front mech. has been virtually trouble free to set up and changes from top to bottom fine. It's the rear I'm having problems with...

...if I hold the end of the gear cable tight the shifter clicks up/down 1-9-1 just fine, with nice defined 'clicks.' However, with the cable fitted to the mech. it just will not shift correctly! Instead of eight sharp 'clicks' selecting one gear after another all I'm getting is maybe five clicks across the cassette as it jumps from 1 to 3 to 5 to 6, 8 and 9.

I've tried everything I can think of; I've swapped out the top alloy jockey wheel for a bog-standard Shimano, I've checked the alignment time and again, I've tightened/slackened cables, etc, etc, all to no avail...

...I simply cannot get this mech to shift! :evil:

Anyone got any ideas re SRAM/Shimano compatability, or anything else I could be missing? This has driven me nuts this afternoon and quite spoiled my day!


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:02 pm 
Section Moderator & South West AEC
Section Moderator & South West AEC
User avatar

Joined: Mon Jun 25, 2007 3:33 pm
Posts: 8164
Location: new forest
if you're running a shimano mech it won't work, x7 shifters have a 1 to 1 cable pull ratio which is different to shimano so it won't shift right, solution is shimano shifter or sram rear mech.

this is only specific to the rear by the way, makes no difference on the front


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:03 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Fri Oct 10, 2008 8:44 pm
Posts: 3584
Location: Wherever it is, I'm being just that little bit more Lance
SRAM shifter and Shimano mechs?

Hazy memory about different pull ratios so the shifters and mechs not working together, the exception being that Shimano mechs work with the SRAM named shifters, Rockets etc, as they had the same pull ratio as Shimano but the numbered ones, X7 etc didn't.

Someone help and translate the above in to English.


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:04 pm 
Retro Guru
User avatar

Joined: Thu Jun 23, 2011 11:25 pm
Posts: 1786
Location: It's not easy being a dolphin.
SRAM shifter and Shimano rear mech? Thought they had a different cable pull ratio; albeit the actual cassette spacing is the same. Beer and lump hammer needed.


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:12 pm 
Retro Guru
User avatar

Joined: Thu May 03, 2012 7:13 pm
Posts: 2574
Location: The Cock Inn, Tillett, Herts
X or SX series SRAM shifters only work with SRAM mechs. You either need an X or SX series SRAM mech, or SRAM Ace or Rocket shifters which have the same pull ratio as Shimano.


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:14 pm 
Old School Grand Master
User avatar

Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
Hell fire! Wish I'd asked earlier... :oops:

Thank you guys, eBay it is then; just have to decide which to change, though I think I'd rather keep the LX rear mech.


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 7:55 pm 
East Midlands Deputy AEC
East Midlands Deputy AEC
User avatar

Joined: Mon Aug 18, 2008 9:39 pm
Posts: 2028
Location: Ashby-de-la-Zouch
I'd stick with the LX. I have sram on one of the bikes and although the change is really sweet I have found the mech to be fragile in comparison with Shimamo. Sram didn't like the mud at Mayhem last year. But the biggest faff is not being able to pull the wheel into place easily without inverting the bike. I'd hoped to have a variety of drive train but I may be returning to just Suntour and Shimano.


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 8:07 pm 
Old School Grand Master
User avatar

Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
:( Well, following the advice above, I just dived onto ebay and nabbed the only 9-speed SRAM Rocket shifter listed Worldwide(!) - no Ace shifters at all... :o


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 8:14 pm 
King of the Skip Monkeys
King of the Skip Monkeys
User avatar

Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26175
Location: Moomin Valley
Quote:
I would offer to help but I'm only an 'Engineer' so what do I know ??


This will have to change!


Top
 Profile  
 
 Post subject: Re: AAAARGH! WTF? Help!
PostPosted: Mon Jun 10, 2013 8:40 pm 
Old School Grand Master
User avatar

Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
legrandefromage wrote:
Quote:
I would offer to help but I'm only an 'Engineer' so what do I know ??


This will have to change!


:lol: Ah yes, but at least I know what to do when I have the right info. :wink:


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google Adsense [Bot], jimo746, mkone, shawnb, Yahoo [Bot] and 64 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group