Retrobike Forum Index

It is currently Mon Oct 22, 2018 1:29 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Tue Apr 24, 2018 7:05 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Sun Nov 23, 2008 10:44 pm
Posts: 3690
Location: Rushden......ish
I have a long cage M735 to go on my current build but its turned out to be a bit knackered.
It seems the short cage ones are more common, whats the difference??

It's going to be run with Middleburn RS1 cranks and rings.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 7:08 pm 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14791
Location: Surrey
I think it's the cassette which will define what length of cage is best, not the chain rings. A rear mech will generally have a max tooth count associated with the largest cog on the cassette.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 7:09 pm 
Gold Trader
Gold Trader
User avatar

Joined: Fri Aug 20, 2010 11:28 am
Posts: 7271
Location: Gorleston-on-sea (If there is a bright center to the universe this is place furthest from it
What is the cage like on your old one ? As they can be easily swapped over :wink:


Top
 Profile  
 
 Post subject: Re: Re:
PostPosted: Tue Apr 24, 2018 7:17 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3077
ishaw wrote:
I think it's the cassette which will define what length of cage is best, not the chain rings. A rear mech will generally have a max tooth count associated with the largest cog on the cassette.
No, it's both.
Cage length is determined by the difference from big to small ring on the front plus the difference big to small cog on the back. (Capacity) The mech model (specifically the parallelogram geometry/angle/position) determines maximum rear sprocket.

What size rings and cassette are you going to use?


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 7:20 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Aug 08, 2008 2:36 pm
Posts: 17817
Location: Yorkshire, England
The difference is just the amount of chain they can wrap around it. So a long cage lets you use a wider range of gears.
Long cages are actually more common, or should be.
Weenies used the short cage though.

In the real world, both will run on 32 -12 cassettes , with 24-26-46 chainrings. As was common back in the day.
A short cage just gets floppier earlier on granny ring/small rings at the back.

Setup is the same.

If for some reason you like to live dangerously, you can set it up 'wrong' so you can run more granny gear ratios, but risk and will jam it in big/big or snap the chain.
That's up to you.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 9:12 pm 
Retro Guru
User avatar

Joined: Sun Jul 09, 2006 11:07 pm
Posts: 1756
Location: muddy fields, usually
BITD I preferred to run a short cage, setup so that it ran properly in small/big and big/small combos but would jam in big/big - and just remembered not to shift into it!


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 10:21 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Sun Nov 23, 2008 10:44 pm
Posts: 3690
Location: Rushden......ish
Will check what cassette i'm using tomorrow but rings are 24,36,46.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 11:29 pm 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14791
Location: Surrey
Have things changed with modern mechs then? I have a short cage xo 10 speed that has a max rear sprocket size, and I've done a bit of research which suggests it doesn't end well if you go larger.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Wed Apr 25, 2018 1:42 am 
Retro Guru
User avatar

Joined: Sun Jul 09, 2006 11:07 pm
Posts: 1756
Location: muddy fields, usually
No, old rear mechs have a maximum sprocket size too - I think we're just taking it as a given that it won't be exceeded - but the difference between long and short cages isn't usually the max sprocket size, it's the total capacity due to the amount of slack they can take up.


Top
 Profile  
 
 Post subject: Re: Re:
PostPosted: Wed Apr 25, 2018 5:37 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3077
ishaw wrote:
Have things changed with modern mechs then?
Nope, you just haven't read the other posts very well ;)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google Adsense [Bot] and 10 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