Retrobike Forum Index

It is currently Sat Dec 10, 2016 6:34 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Too much fettling
PostPosted: Tue Nov 20, 2012 12:57 pm 
Devout Dirtbag

Joined: Tue May 24, 2011 8:18 pm
Posts: 108
Location: Warwickshire
All in a tiz now.

Changed my 44-32-22 chainset to 42-32-22 because a nice new 42t middleburn ringset came up cheaply. It also meant that my short cage rear mech could now accommodate a 11-34 tooth cassette rather than the 11-32.

So I dropped the front mech to account for the smaller chainring and all has been well, but.... I happened to look at the installation leaflet for my XT front mech. It stated that the min tooth difference between big and middle ring was 12 teeth. My set up now has a min of only 10 teeth (but appears to work fine). So, out of interest, I had a look to see what front mechs were suitable.

Now I thought that 42-32-22 was a relatively common choice - but it appears not. Having looked through the shimano docs website I have found reference to only one lower spec front mech (still available but essentially discontinued) that accommodates a 42-32-22 chainset.

I'm sticking with the XT for the time being, at least until I am persuaded otherwise. Anyone had problems with a 42-32-22 set up?

Too much fettling again - just don't learn my lesson.

Rob


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 20, 2012 5:20 pm 
retrobike rider
retrobike rider
User avatar

Joined: Tue Jul 14, 2009 7:52 pm
Posts: 1904
Location: Trancecentral
I have with 48/38/28 on hybrid bikes, Truvativ chainsets are the culprit on mine, as stock they are usually spec'd with a lower end front mech, Nexave type.

10/10/10 differences are trouble, I had an XT F mech working but set up was very picky and had to be setup bang on to allow smooth shifting to either big or small ring, it didn't take much (cable stretch etc) to go out of whack.

I think lower end F mechs are more forgiving, Nexave seem to be a fave on hybrid bikes.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 20, 2012 6:10 pm 
Old School Grand Master
User avatar

Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4074
Location: Antwerp, Belgium
42-32-24 on an XT FD-M770 front mech, and that's shifting just fine. Bit of chainsuck, but that's due to a crappy crankset (M5xx something Deore).


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 20, 2012 6:17 pm 
Devout Dirtbag

Joined: Tue May 24, 2011 8:18 pm
Posts: 108
Location: Warwickshire
Well as luck would have it, CRC are selling off the LX M570 at £9 with discount. As far as I can see it is the only, currently available, front mech designed to correctly accommodate a 9 speed 42-32-22 chainset.

For the sake of £9 I have ordered one to see what difference it makes.

More fettling. What'll be next? :)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 8 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