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

Thread Tools Search this Thread
Old 01-20-14, 01:56 PM   #1
zak rider
Thread Starter
Join Date: Jan 2014
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Triple chainset advice pls

Hi, new to forum, I live in an island in the middle of the indian ocean and have very limited bike spares, need some tech advice:

1) Is it normal for the teeth on a new triple chainset to have different profiles on the same chainring? Some teeth are pointed, some are shorter and squarer. This is a LASCO triple I'm looking at in a shop, need to clarify before I buy.

2) How can I tell if any new chainset I buy will match the spindle on my bike? The Chainset I currently have fitted is a SR SUNTOUR XR 120 - does that mean the square hole is 12mm wide?

Many thanks,
zak rider is offline   Reply With Quote
Old 01-20-14, 02:05 PM   #2
Senior Member
Join Date: Aug 2006
Posts: 1,019
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 79 Post(s)

Most new cranksets have ramped chainrings with oddly-shaped teeth to improve shifting.

There are some subtleties of matching square spindles and cranksets, but most of the time things play together fine. I'm not familiar enough with your Lasco or Suntour to know if they're exactly the same, but I'd bet they'll be close enough that the Lasco will fit on your BB like the Suntour. Maybe somebody else will have a better answer.

More reading on spindles here:

- Mark
markjenn is offline   Reply With Quote
Old 01-20-14, 02:06 PM   #3
Crescent Cycle
Senior Member
Join Date: Jan 2014
Posts: 260
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
1) Yes, on every ring except the smallest. The teeth on the smallest chainring should look identical

2) The only way to find out is get the manufacturer spec for recommended BB spindle length and measure your current spindle length. There are also two different standards for square tapers, ISO and JIS, but chances are these are both JIS. I would anticipate buying a new BB for the new crank, and consider yourself lucky if you don't.
Crescent Cycle is offline   Reply With Quote

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 02:44 PM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.