Chain length

Discuss light weight issues concerning road bikes & parts.
urbanspaceman
Posts: 29
Joined: Thu May 25, 2017 7:05 pm

by urbanspaceman

Hi. I am hoping to get some advice.

I've set up a Dura Ace chain following the big chainring + largest cassette + 2 links method; however I'm scared it looks like it's overly stretching the rear mech once I'm in large and large (I appreciate that it's a ratio to avoid but I'm worried about causing damage to the rear mech if I accidentally find myself there in the heat of the moment).

I've attached a photo in the hope someone can advise.

Cheers
Attachments
IMG_20181015_215359_resized_20181016_120301875.jpg

ryanw
Posts: 493
Joined: Sat Apr 16, 2016 6:52 pm
Location: London

by ryanw

That is about 2 seconds from ripping your rear mech off...

Needs 2 links in if not more.
'16 Cervelo S5 - 6650g
'17 Focus Mares Force 1 - 7,800g

by Weenie


alcatraz
Posts: 1295
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

I think you did a mistake and added 0 links.

First you find the closest inner plate link and align it with the open rivet, then you add 2 links.

This works for smaller cassettes but I prefer checking both small small and big big before I cut the chain.

urbanspaceman
Posts: 29
Joined: Thu May 25, 2017 7:05 pm

by urbanspaceman

ryanw wrote:
Tue Oct 16, 2018 12:11 pm
That is about 2 seconds from ripping your rear mech off...

Needs 2 links in if not more.
Gah, I thought so. Thanks for replying.

So how's this for a plan to remedy: I break the "missing link" (and presumably throw away as like KMC they are not meant to be reused???), and then add a spare link or 2 rejoining to the existing chain with new "missing links" either side. Would that do me?

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VTR1000SP2
Posts: 439
Joined: Tue Nov 05, 2013 8:21 pm

by VTR1000SP2

I’d use a chain pin where you’re adding and then reuse the master link.


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42.

mattr
Posts: 3821
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Two new missing links will be fine.
If it's a shimano chain, you could also use the (provided?) oversize pin. Or use two of them, or one link and one pin. Any combination should be ok as long as they are fitted properly.

If it's not a shimano chain, do not use a pin to rejoin it.

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VTR1000SP2
Posts: 439
Joined: Tue Nov 05, 2013 8:21 pm

by VTR1000SP2

OP indicates it’s a DA chain
42.

mattr
Posts: 3821
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Yes, missed that. Sorry.

ryanw
Posts: 493
Joined: Sat Apr 16, 2016 6:52 pm
Location: London

by ryanw

I reuse my quick-links about 100x over. Never had one fail with 1,800w sprints going through them...

Personally, I'd buy a new chain (£30) and keep this one as a spare / for use with smaller cassette.
'16 Cervelo S5 - 6650g
'17 Focus Mares Force 1 - 7,800g

ryanw
Posts: 493
Joined: Sat Apr 16, 2016 6:52 pm
Location: London

by ryanw

You also have the chain on the wrong way around!

The lettering on DA chains should be on the outside :thumbup:
'16 Cervelo S5 - 6650g
'17 Focus Mares Force 1 - 7,800g

ooo
Posts: 629
Joined: Sat May 21, 2016 12:59 pm

by ooo

Quick link arrow is in the wrong direction on photo, but if you flip the chain like ryanw suggested it will be in correct direction.

Use online chain calculator (exact chainstay length needed)

Also, there is updated chain length manual from Shimano:

Image
'

Jugi
Posts: 165
Joined: Sun Jun 24, 2018 8:10 am

by Jugi

ryanw wrote:
Tue Oct 16, 2018 1:33 pm
I reuse my quick-links about 100x over. Never had one fail with 1,800w sprints going through them...
During last summer one quick-link disintegrated into my hands when taking the chain of the bike. The pins just fell off the sideplates. It held up during riding just fine. I don’t understand how the manufacturers have come up with the ”do not re-use” suggestion.

mattr
Posts: 3821
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Jugi wrote:
Tue Oct 16, 2018 1:53 pm
I don’t understand how the manufacturers have come up with the ”do not re-use” suggestion.
because the links do have a finite life, just like bolts. But keeping track of it in anything else other than something like aerospace is all but impossible. So instead of saying 5 or 10 or 12 uses. Which no one will be able to track accurately. They say chuck after one use. Lots of bolts in cars are the same. Rather than setting up a system to track how many times a bolt in the suspension has been touched/adjusted (incredibly expensive). They supply a new one with the part. Or provide a compete kit. (Which is cheap to do)

urbanspaceman
Posts: 29
Joined: Thu May 25, 2017 7:05 pm

by urbanspaceman

I love you lot. Thanks a million :beerchug:

urbanspaceman
Posts: 29
Joined: Thu May 25, 2017 7:05 pm

by urbanspaceman

DOUBLE POST SORRY

by Weenie


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