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Lectra eccentrics - grinding noise   Message List  
Reply | Forward Message #793 of 844 |
Hi there Lectra folk.. I have a question regarding the eccentric on my Lectra.

Mine was never a stock Lectra (it's the bike Lawrence Rhodes used to own.. hi Lawrence!).  The frame however appears to be stock, it's the electronics that I did (Alltrax etc).  The long term issue has been it got a 10 mile range whereas on the evalbum I see plenty of bikes with a similar size and battery pack who get a 20 mile range.  Sadness ensues.

In my diagnosis process there are two things which are clearly issues..

One is the rear wheel now has (after 1000+ miles of my riding) flat spots along one side, not the other, of the wheel surface.  Obviously the wheel has been misbalanced.  I noticed the eccentrics were at different positions (e.g. one at 12 o'clock the other at 3 o'clock) and obviously that would geometrically skew the wheel around.  So I've taken care to adjust the eccentrics so they're at the same position.  I assume that's enough to ensure the wheel is properly aligned?  It looks good by eyeball.

Second thing is the biggie for which I have a serious question ...

On the eccentrics there are two holes.. one hole has the axle going through it, and on my bike the other hole has a bolt.  It seems from the lectra manual (Scott sent out a link recently) there isn't supposed to be a bolt through the other hole?  In any case on my bike there is a turnbuckle between that bolt and a mounting point on the swingarm.  It seems the turnbuckles are there to keep the eccentric in a given position.  Lawrence, did you add that bolt & turnbuckle?

The problem is - I just removed the chain (it was rusty and stiff) and the wheel itself spins freely.  But there's a slight grinding noise from the bolt as the wheel spins.  THAT is obviously going to be making an effect on mileage.

I'm wondering .. is the turnbuckle/bolt necessary?  Was that a stock feature?  If it's not supposed to be there how to ensure the eccentrics stay in position?

- David Herron


Fri Jul 10, 2009 9:53 pm

reikiman
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Message #793 of 844 |
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Hi there Lectra folk.. I have a question regarding the eccentric on my Lectra. Mine was never a stock Lectra (it's the bike Lawrence Rhodes used to own.. hi...
David Herron
reikiman
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Jul 10, 2009
9:54 pm

Hi David -- The issues you describe would affect range, for sure; for they would dramatically increase rolling resistance: (1) Chain must be clean, lubricated...
lectrascott
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Jul 10, 2009
11:20 pm

Hey Scott, thank you for the reply. There are two screws holding together the very back of the swing arm. I assume it's meant that when you tighten those...
David Herron
reikiman
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Jul 10, 2009
11:39 pm

Yes. Make sure you loosen them when adjusting the chain/axle. Then tightened snuggly to hold the eccentrics in place....
lectrascott
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Jul 11, 2009
1:49 am
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