chain tensioners

[Job]

When I was checking my chain, I found yet another problem.
On the inside face there are protruding remnants of the injection moulding process:

tensioner with moulding protrusion

tensioner moulding.jpg (226.75 KiB) Viewed 4382 times

left tensioner, in between the two screwholes you see the bit sticking out.

Because of this, the face is not flat.
This leads to two things:
1. the bearing is not in plane with the wheel, which causes extra friction.
2. the plastic tensioner itself deforms:

tensioner face not flat

tensioner not flat.jpg (212.07 KiB) Viewed 4318 times

look at the space in between the tensioners.

It 's easy to scrape off the protruding bit with a knife, but I doubt the tensioner will level out again.
So it's probably best to fit new tensioners in my case.

Job

[Job]

As I wrote in the Amsterdam A-biker post (but it's more appropriate to this topic):

Regarding the chain tensioner:
The drilling of extra holes in between the standard ones is an interesting option that I'm considering as well.
So when I bought the new screws, I also got an extra long set. These are needed if I drill extra holes, cause the nuts won't sit in their recess anymore.

I'm delaying this option because it will weaken the plastic tensioner ring, and I don't have spare ones yet.
Also I'm waiting helpful advice (and hopefully some new parts) from the abike-shop.nl.
If I get a new chain, chances are the length will be different, so no drilling yet!

Interesting enough, this copy of an a-bike (with solid tyres!) has chain tensioners with extra holes, so they allow you to select one of 8 positions instead of one of only 4.

look at the picture 0:15sec into the video:
http://www.youtube.com/watch?v=dm7pdYcR ... re=related

That would make a big difference!
Only I don't think spares from copy a-bikes will be easy to get.
So still have to make something myself.

Job