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


Go Back   > >

BMX Dirt, vert, flatland or street? Drop in the BMX forum to talk to other 20" riders around the world. What is the best BMX bicycle for you? Learn all about it here.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 12-18-04, 10:00 AM   #1
16Victor 
Lanterne rouge
Thread Starter
 
16Victor's Avatar
 
Join Date: Dec 2004
Location: Cincinnati, Ohio, USA
Bikes: 1980 Raleigh Competition GS, former: 1980 Colnago Super :(
Posts: 392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Another 3 pc. crank question

This regards a new 3 pc crank installation. I took a 1 pc. out. The bearings are pressed in nicely - Just have to begin setting the chain line.

Question is, when putting the arms on the splines, I assume the center bolt should be tightened first, squeezing the assembly together, and then the pinch bolt tightened?

How hard do I gronk on the center bolt?

Any other setup procedure advice is VERY welcome.

TIA
__________________
Ron
Any problem can be solved with the proper application of force, heat, chemicals, or money.
16Victor is offline   Reply With Quote
Old 12-18-04, 11:27 AM   #2
BMXTRIX
Senior Member
 
BMXTRIX's Avatar
 
Join Date: Jul 2004
Bikes:
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I usually just tighten the bolt until the cranks and everything is firm. So, I don't torque the crap out of the bolt, but make is firmly tight. I use profiles, so no pinch bolt on my cranks, but you are correct. First the spindle bolts are tightened then the crank arm bolts. The crank arm bolts are tightened about the same. Firm, you don't want to break those bolts inside the crank arms. They just keep the crank arm from wiggling around, they aren't to hold the crank arm on, so firmly tight is plenty.
BMXTRIX is offline   Reply With Quote
Old 12-19-04, 09:03 PM   #3
16Victor 
Lanterne rouge
Thread Starter
 
16Victor's Avatar
 
Join Date: Dec 2004
Location: Cincinnati, Ohio, USA
Bikes: 1980 Raleigh Competition GS, former: 1980 Colnago Super :(
Posts: 392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BMXTRIX, thanks.

FWIW, what I did was:
- loosely install the chainwheel onto the crankarm
- loosely install the RH crankarm onto the spindle
- set the chainline with shims and a special straightedge I made up
- install the LH crankarm and shimmed so it's the exact same distance from the chainstay as the RH arm
- tweaked the two center bolts back and forth until the spindle was pretty well centered
- tightened everything up.

Seems good to go.

Should I have used antisieze on the splines? How about loctite on the pinch bolts?

Thx!
__________________
Ron
Any problem can be solved with the proper application of force, heat, chemicals, or money.
16Victor 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 08:33 PM.