Retrobike Forum Index

It is currently Sat Dec 03, 2016 3:29 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
 Post subject:
PostPosted: Thu Jun 12, 2008 1:50 pm 
Gold Trader
Gold Trader
User avatar

Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
Agency_Scum wrote:
Ah, thick twit alert, I thought he was doing it with the itsy-bitsy short-arse road mech. :roll:


"2007 Trek SL1000 cheapo road bike, double front chain rings 39 & 53T - 8 speed SRAM cassette 12-23T - Tiagra short cage rear mech. "

There's nothing to misunderstand there Agency Scum.

I think it's One-eyed Jim read it wrong. Not you.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 1:51 pm 
Gold Trader
Gold Trader
User avatar

Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
one-eyed_jim wrote:
Just to be sure we're on the same page, we're talking about a road double up front with an mtb mech and cassette at the rear, right?


Errr. no.

Tiagra short-cage is a road mech. Not to be used with more than 27T.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 1:54 pm 
BoTM Winner / retrobike rider
BoTM Winner / retrobike rider
User avatar

Joined: Thu Nov 23, 2006 2:12 pm
Posts: 5785
Chris - i have an 8spd 12-26 you can borrow? 39x26 will get you up there :wink:


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 2:30 pm 
Old School Grand Master
User avatar

Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5782
Location: Lost in Translation
dbmtb wrote:
one-eyed_jim wrote:
Just to be sure we're on the same page, we're talking about a road double up front with an mtb mech and cassette at the rear, right?

Errr. no.

Tiagra short-cage is a road mech. Not to be used with more than 27T.

I know that Tiagra is a road group, as is clear from my earlier replies.

REKI says he has a Tiagra short cage and wants to run a 32t sprocket. I replied that it might work (as a 105 5500 - a short cage road mech - has worked for me with a 32 in the past) but he may need to use an mtb rear mech and a longer chain, or a smaller biggest sprocket than 32t.

Agency Scum says:

Quote:
You'll have a shagging awful time of it with all the extra chain and new mech

Note, the *new* mech. Then:

Quote:
old short one won't work

So the context of his remark seemed to me to be that he didn't think an mtb mech (because you wouldn't change one short cage road mech for another) would work well. I wasn't sure that was what he meant, hence my check.

In any case, increased wear isn't an issue: either the mech clears the sprocket or it doesn't. That depends on the axle-hanger dimension.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 3:45 pm 
Gold Trader
Gold Trader
User avatar

Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
one-eyed_jim wrote:
REKI says he has a Tiagra short cage and wants to run a 32t sprocket. I replied that it might work (as a 105 5500 - a short cage road mech - has worked for me with a 32 in the past) but he may need to use an mtb rear mech and a longer chain, or a smaller biggest sprocket than 32t.

In any case, increased wear isn't an issue: either the mech clears the sprocket or it doesn't. That depends on the axle-hanger dimension.


On these points we agree.

At the end of the day - if the guy wants to be sure that his kit is covered by warranty and product liablility - then the only sure way, is to follow manufacturer's recommendations.

"Someone on an internet forum told me it might work" is unfortunately not going to cut any ice with the warranty department, and any injury claims compensation if it all goes pear shaped.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 5:35 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Oct 28, 2005 1:10 am
Posts: 4471
Location: Bristol
This is getting complicated. Let's all have a macaroon. I'll get the kettle on.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 10:59 pm 
Old School Grand Master
User avatar

Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5782
Location: Lost in Translation
dbmtb wrote:
At the end of the day - if the guy wants to be sure that his kit is covered by warranty and product liablility - then the only sure way, is to follow manufacturer's recommendations.

... and buy from an authorized dealer and have the components fitted by a Shimano certified mechanic?

I understand why Shimano publishes the specs it does, and I understand why they're conservative. If product manager A orders 1000 of derailleur B he wants to know they're going to bolt right on and work with cassette C - no fussing with chain length or b-tension. Shimano have to guarantee that. That's not REKI's case - he wants to put together a special system for a special ride, and wants to know what he might get away with.

Quote:
"Someone on an internet forum told me it might work" is unfortunately not going to cut any ice with the warranty department, and any injury claims compensation if it all goes pear shaped.

That's true. But anyone who wants to know the official, straight-down-the-line Shimano spec can go to the Shimano website and read it off a chart. Anyone asking questions on an internet forum gets internet forum answers - things that work that aren't supposed to, a mix of bad advice and good, experience and hearsay.

If we'd all followed Shimano spec, we'd never have found the hidden click in our XT thumbshifters or put Ultegra freehub bodies on our XT hubs. Surely that's all part of what a forum like this is about.

Anyway, it's late. Let's join Agency Scum for an Ovaltine.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 11:14 pm 
rider | rBoTM Winner
rider | rBoTM Winner
User avatar

Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5131
Location: Wakefield, Yorkshire
I'd rather have a Horlicks - if it's not to much trouble.

One sugar please.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 12, 2008 11:49 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Oct 28, 2005 1:10 am
Posts: 4471
Location: Bristol
I've only got Horlicks Lite, though I'm led to understand it's quite agreeable. Hobnob?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 13, 2008 12:56 am 
King of the Skip Monkeys
King of the Skip Monkeys
User avatar

Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26146
Location: Moomin Valley
yawn.... tired after my shift so wont go into it too much....

heres my then 8spd commuter with very short cage mech (XT/ 105 Hybrid), 53 front, 32 rear, long chain and a GING tensioner - works a treat.... does 9spd as well


Attachments:
zaskar.JPG
zaskar.JPG [ 152.77 KiB | Viewed 526 times ]
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google Adsense [Bot] and 16 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