Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-24-02, 01:53 PM   #1
Ziggy114
Newbie
Thread Starter
 
Join Date: Jul 2002
Location: Edmonton
Bikes: '05 Kona Cinder Cone
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Crankset Offset Problems

I have been working on repairing my mountain bike as it was stolen but later found. Except for my crankset, I'm finished. I found that the original chainrings were bent severely enough that the chain would not ride in any one gear smoothly, so I bought a new one. It's definitely not an expensive bike, so I bought a cheaper Shimano Acera X set. My problem is that the backset of it is different from the original (it sticks out further when mounted) and my derailleur cannot reach top gear. I thought about flipping the axle so that the crank mounted on the short end instead of the long one, but have not done so yet. Can I do this, or do I nead to buy a new axle?

Thanks for any help you can give me.
Ziggy114 is offline   Reply With Quote
Old 07-24-02, 03:10 PM   #2
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The solution you proposed won't work out, because one end of the axle assembly (aka "bottom bracket") is left-hand thread and so it won't go in the other direction. You'll need to pick up a new bottom bracket unit to correct the problem.

It looks like the AceraX crank is meant to use a bottom bracket with a spindle length of about 110-113mm. The width of your frame's bottom-bracket shell (the sideways cylindrical part of the frame that the bottom bracket is in) will also be important, the most common widths being 68mm and 73mm, so take note of that measurement too. Or rely on your local shop to set you up with the right unit. You'll need a special tool to install the BB if you're doing the work yourself.
mechBgon is offline   Reply With Quote
Old 07-24-02, 03:17 PM   #3
pokey
Senior Member
 
Join Date: Jun 2002
Bikes:
Posts: 1,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
On a cup and cone BB the spindle can be flipped, without messing with the cups.. And,even on a cartridge type, the drive side threaded 'cup' can be removed,the carteidge flipped and the flanged 'cup' reinstalled on the former left side of the carteidge.
pokey is offline   Reply With Quote
Old 07-24-02, 03:34 PM   #4
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That's true, could be a cup/cone setup.
mechBgon is offline   Reply With Quote
Old 07-24-02, 07:25 PM   #5
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Posts: 17,057
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
Make sure your new cranks fit properly onto the spindle. There are at least two different standards (most Shimano versus almost everyone else) for the size of the end of the shank.
__________________
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:25 PM.