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PostPosted: Thu Nov 07, 2013 8:23 pm 
retrobike rider
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casper2788 wrote:
Yes the chain is slightly catching the inside of the large chainring.


Does it vibrate on the next rear ring up from small ? If you get my drift.....


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PostPosted: Thu Nov 07, 2013 8:25 pm 
Dirt Disciple
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bugloss wrote:
casper2788 wrote:
Yes the chain is slightly catching the inside of the large chainring.


Does it vibrate on the next rear ring up from small ? If you get my drift.....

I'm catching your drift.Yes, but very hardly noticible.


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PostPosted: Thu Nov 07, 2013 8:46 pm 
retrobike rider
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As ScillySuffolk said, you shouldn't use the extremes i.e. small/small or large/large as the chain has to much diagonal movement for it to cope with. If you persist in using them it will accelerate the wear on your front chain rings, stretch the chain quicker and wear out the bottom jockey wheel on the rear derailleur.

The rear block won't wear as much as it's probably made of steel.


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PostPosted: Thu Nov 07, 2013 8:49 pm 
Dirt Disciple
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So it would just seem to be gear selection that's causing it,but going back to the original post would you expect the gap on the axle to be the same on both sides or has the chainring hole possibly got larger.


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PostPosted: Thu Nov 07, 2013 8:53 pm 
retrobike rider
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I doubt the chain ring hole has got larger, as it would require a lot of force for the axel to stretch it out. You are more likely to break the bolt than enlarge the square hole.


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PostPosted: Thu Nov 07, 2013 8:55 pm 
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bugloss wrote:
I doubt the chain ring hole has got larger, as it would require a lot of force for the axel to stretch it out. You are more likely to break the bolt than enlarge the square hole.

:D


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PostPosted: Thu Nov 07, 2013 9:01 pm 
retrobike rider
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You could always compare the two crank/axel holes by measuring them.


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PostPosted: Sat Nov 09, 2013 1:44 pm 
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casper2788 wrote:
ScillySuffolk wrote:
^ Exactly!

What cranks do you have and how wide/long is the BB?

The cranks are dura ace 7402 and the axle is 115mm wide.I don't suppose the crank bolt hole has widened do you think. :? :cry:also dura ace b/b.
These three sources state 112mm for British/ISO shells:
Velobase
Moruya
Bikepro

The gap between the small chainring and the chainstay is a better indicator than the gap twixt crank and cup: should only be a couple of mm or so.


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PostPosted: Sat Nov 09, 2013 2:05 pm 
retrobike rider
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I had a look down at my cranks yesterday in the pouring rain and driving wind (still summer here) and noticed that the axel went in up to the hilt.

I couldn't see any axel taper at all, so maybe yours don't match up. I've got Campag Record cranks and a Campag axel.


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PostPosted: Sun Nov 10, 2013 4:36 pm 
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can anyone tell from the picture which way the axle goes in,if you look at either end of the axle one end is different.


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axle2 032.JPG
axle2 032.JPG [ 90.17 KiB | Viewed 175 times ]
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