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


Go Back   > >

Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-07-11, 09:03 PM   #1
wheelspeed
Senior Member
Thread Starter
 
wheelspeed's Avatar
 
Join Date: Jul 2008
Location: Pittsburgh
Bikes: 2004 Trek T2000
Posts: 264
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Confirmation I Should Wail on This Eccentric?

Before I insert a longer bolt and hammer on it like some kind of roofer, can anyone confirm this is a wedge-type ECC and that I'd be doing the right thing to hammer at it?

From searches and other sites, I'm 90% sure I'm okay, but would prefer a little support first. It's the stock eccentric on this 2004 Trek T-2000. By the way, is there a special tool to remove the small aluminum 'lock nut' or whatever it's called? The notches are too far apart even for my largest screw driver.



wheelspeed is offline   Reply With Quote
Old 08-08-11, 04:30 AM   #2
PMK
Senior Member
 
PMK's Avatar
 
Join Date: May 2008
Location: Royal Palm Beach, Florida
Bikes: 2006 Co-Motion Roadster (Flat Bars, Discs, Carbon Fork), Some 1/2 bikes and a couple of KTM's
Posts: 1,155
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
If you plan to pull the eccentric and lube it all to prevent corrosion or minimize this problem next time, get those cranks off while it's still tight.

Not sure what to say in regards to the jamb nut being wider than your screwdriver. I guess buy a larger screwdriver or maybe locate a huge setscrew that uses an Allen wrench. The proper tool though is possibly a chainring bolt tool, most times very inexpensive.

My true thoughts are that the jamb nut is not truly a jamb nut but rather a seat for when the bolt is loosened. This will allow the bolt head to seat and then begin pushing the expander loose.

Before you beat it apart, did you try inserting the Allen wrench through the jamb nut and then loosen it? Once the bolt is loosened, it will get easy to turn for a few revs, then get difficult again as it unseats the wedge.

Best of luck with it.

PK
PMK is offline   Reply With Quote
Old 08-08-11, 05:37 AM   #3
ct-vt-trekker
Senior Member
 
Join Date: Jun 2007
Location: CT
Bikes:
Posts: 335
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
NO, do not hammmer on this. You have a self extracting eccentric and a hammer is not ever needed. What you do is leave the "locknut" in, put the allen wrench throught the locknut and start loosening the wedge bolt. Continue to loosen the wedge bolt until the head of the wedge bolt hits against the locknut. Keep loosening the wedge bolt for several more turns and the wedge will be driven out the other side. It's a great design but many don't know how to use it. Even the bike shop where I bought my tandem didn't know how to use it.
ct-vt-trekker is offline   Reply With Quote
Old 08-08-11, 08:08 AM   #4
wheelspeed
Senior Member
Thread Starter
 
wheelspeed's Avatar
 
Join Date: Jul 2008
Location: Pittsburgh
Bikes: 2004 Trek T2000
Posts: 264
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Cool! Thanks guys. I see that hammering may have worked, but using that nut (maybe I should call it a "stop nut") is definitely a much more elegant way to do it. I didn't think of that at all. I'll try it out this evening.

I'll track down a chainring bolt tool also. Since that nut is aluminum, it bothers me to be using that screw driver.
wheelspeed is offline   Reply With Quote
Old 08-08-11, 08:30 AM   #5
specbill
Riding Heaven's Highwayson the grand tour
 
Join Date: Sep 2007
Location: Tehachapi Mtns, Calif.
Bikes: '10 C'Dale Tandem RT2. '07 Trek Tandem T2000, '10 Epic Marathon MTB, '12 Rocky Mountain Element 950 MTB, '95 C'dale R900, "04 Giant DS 2 '07 Kona Jake the Snake, '95 Nishiki Backroads
Posts: 737
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ct-vt-trekke has it 100% right, it is a self extracting eccentric.
So, since you have both the ""stop nut"" and the allen-head bolt out of the eccentric at the moment, first put the allen bolt back in the eccentric until it lightly seats,, then put back the "stop nut just like it was, then put an allen wrench through the 'stop nut' and turn the allen bolt counter clockwise....it will turn easy for a turn or two, then it will get harder to turn as it butts against the backside of the 'stop nut' for a turn or two until it pushes the wedge piece free on the opposite side of the eccentric.
It is a nice simple setup that works well. Good luck

Bill J.
specbill is offline   Reply With Quote
Old 08-09-11, 10:38 AM   #6
wheelspeed
Senior Member
Thread Starter
 
wheelspeed's Avatar
 
Join Date: Jul 2008
Location: Pittsburgh
Bikes: 2004 Trek T2000
Posts: 264
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yep, replacing the long bolt and the stop-nut and then loosening the long bolt, letting it press against that stop-nut, worked like a charm. No hammering necessary.

By the way, I had a chainring bolt wrench and tried it on that stop-nut, but the tool was just a tiny bit too large. But that's not a big deal.

Thanks again!
wheelspeed 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 07:13 PM.