Chain device for 2X9 setups

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Step83
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Chain device for 2X9 setups

Postby Step83 » Sun Jun 30, 2013 14:46 pm

Had a real mare today, found a brilliant section of roots which were more like a staircase lovely challenging decent but totally ruined by my chain coming off at every opportunity.
Both me and my friend thought it must be the front mech being too far in so with the aid of a tree we adjusted it out. went off ten minutes later same again going over rough terrain. Picked up some lovely snake bites from trying to pedal with no chain.

Now im not sure if i need a chain device or just to lower the front mech hence me asking. Ive gone from a 3X9 setup to a 2X9 with bashring. I have a Bioncon C guide and the front mech is still in the same place it was for the 3X9 setup. Should i drop the mech down or get a 2X9 guide (if so which) or should I do both? Note the frame has no ISCG mounts but thankfully its not a pressfit BB so any guides would need to be BB compatible unless i can find a plate.

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Tom Barton
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Re: Chain device for 2X9 setups

Postby Tom Barton » Sun Jun 30, 2013 15:52 pm

Tight front mech adjustment only gets you so far. Two options:

1. A new style clutch rear mech will improve chain retention and reduce any annoying chain slap noise you may get but its not gonna work all the time.

2. Yep - a lower chain device will definitely help keep that chain on the vast majority of the time.

A quick google provides:

Expensive ones:
http://www.tweekscycles.com/Product.do?method=view&n=3511&g=248388&p=74262&c=215&utm_source=Google&utm_medium=Base&utm_campaign=Chain%20Guides&gclid=CJL4tvGQjLgCFVMftAoda3wAtQ

Cheap ones:
http://superstar.tibolts.co.uk/product_info.php?products_id=336

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The Rookie
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Re: Chain device for 2X9 setups

Postby The Rookie » Sun Jun 30, 2013 16:30 pm

Where was the chain coming off?

Which ring front and sprocket rear?

Have you shortened the chain from it's 3x9 length to take advantage of the extra control it would bring?

You can't get a 9speed damped (clutch) mech.

crispy1980
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Re: Chain device for 2X9 setups

Postby crispy1980 » Sun Jun 30, 2013 16:39 pm

I have done the same thing and I use a black spire dtinger device. Works a treat, never had the chain drop soncr

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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Sun Jun 30, 2013 16:45 pm

The Beginner wrote:Where was the chain coming off?

Boinging down a section of roots and also on a couple of bumpyish fire trails

Which ring front and sprocket rear?

Granny on the front rear once in the top rest mid cassette

Have you shortened the chain from it's 3x9 length to take advantage of the extra control it would bring?

Two links removed, not taken more due to the chain guide under the chainstay

You can't get a 9speed damped (clutch) mech.

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cooldad
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Re: Chain device for 2X9 setups

Postby cooldad » Sun Jun 30, 2013 16:51 pm

I have found that if everything is adjusted correctly things don't just come off. Probably helps to use tools to adjust things and not trees.
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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Sun Jun 30, 2013 17:33 pm

cooldad wrote:I have found that if everything is adjusted correctly things don't just come off. Probably helps to use tools to adjust things and not trees.


The tree was our impromtu bike stand i did use me tools ;)

Ill have a proper go through the Parks guide for chain length an setup its probably me being a plank not setting things up correctly. On that note, mech clearance should it be same as it would for a 3X9 setup? or should i treat my middle ring which is now the biggest as a guide for height?

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The Rookie
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Re: Chain device for 2X9 setups

Postby The Rookie » Sun Jun 30, 2013 17:44 pm

Step83 wrote:
The Beginner wrote:Where was the chain coming off?

Boinging down a section of roots and also on a couple of bumpyish fire trails

Nach, inside or outside of the chainrings?

42-32 is 5 teeth on a 180 wrap so you should be removing 4 links (2 pairs) at least, maybe 3 pairs, unless the guide wasn't there on 3x10, size it properly as per SRAM/Shimano/Parktools (all end up at the same length!)

You want as much chain wrapped as possible, so always use the big chainring when there is a possibility of losing it, this will mean you use a larger sprocket at the rear than if you are using the granny.

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felix.london
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Re: Chain device for 2X9 setups

Postby felix.london » Sun Jun 30, 2013 19:20 pm

cooldad wrote:I have found that if everything is adjusted correctly things don't just come off. Probably helps to use tools to adjust things and not trees.


This ^^

On rough stuff make sure you're using the middle ring and one of the biggest sprockets on the rear. If everything is setup properly you shouldn't be losing the chain.


Tom Barton wrote:
1. A new style clutch rear mech


These are only 10sp
"Why have that extra tooth if you're not using it?" - Brian Lopes

Votec V.SX Enduro 'Alpine Thug' 2012/2013 build

Trek Session 8

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Thelonegroover
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Re: Chain device for 2X9 setups

Postby Thelonegroover » Mon Jul 01, 2013 08:50 am

Step83 wrote:
cooldad wrote:I have found that if everything is adjusted correctly things don't just come off. Probably helps to use tools to adjust things and not trees.


The tree was our impromtu bike stand i did use me tools ;)

Ill have a proper go through the Parks guide for chain length an setup its probably me being a plank not setting things up correctly. On that note, mech clearance should it be same as it would for a 3X9 setup? or should i treat my middle ring which is now the biggest as a guide for height?


Yes, use your largest ring as the guide. So, if you've removed the old largest ring, you will need to lower the mech to the new largest ring. Assume you have set the H and L screws?
Genesis Core 30 green - the naughties
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The Rookie
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Re: Chain device for 2X9 setups

Postby The Rookie » Mon Jul 01, 2013 09:56 am

Thelonegroover wrote:
Step83 wrote:
cooldad wrote:I have found that if everything is adjusted correctly things don't just come off. Probably helps to use tools to adjust things and not trees.


The tree was our impromtu bike stand i did use me tools ;)

Ill have a proper go through the Parks guide for chain length an setup its probably me being a plank not setting things up correctly. On that note, mech clearance should it be same as it would for a 3X9 setup? or should i treat my middle ring which is now the biggest as a guide for height?


Yes, use your largest ring as the guide. So, if you've removed the old largest ring, you will need to lower the mech to the new largest ring. Assume you have set the H and L screws?

Bad idea....you need to keep the form of the mech aligned with where it shifts, so unless you lower it all the way down (assuming you can) then your better off just running the mech so it aligns with the granny and middle as it did before.

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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Mon Jul 01, 2013 12:19 pm

Ive enough room to drop the mech down so it can sit just above the middle ring if needed. I can see the benefit as it cant throw the chain off the outer ring as easily.

Ill faff with the chain length tonight as that obviously wont affect the front mech and ill get a bundle of photos as well if itll help.

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The Rookie
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Re: Chain device for 2X9 setups

Postby The Rookie » Mon Jul 01, 2013 12:42 pm

So inside or outside?

A bash or outer guide ring will stop it coming off the outside!

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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Mon Jul 01, 2013 15:48 pm

Bash is on the outer problem im having is it dropping off the granny onto the frame

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cooldad
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Re: Chain device for 2X9 setups

Postby cooldad » Mon Jul 01, 2013 16:23 pm

So adjust the mech properly, and don't ride in granny going down bumpy stuff. Save it for steep uphills.
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felix.london
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Re: Chain device for 2X9 setups

Postby felix.london » Mon Jul 01, 2013 16:33 pm

cooldad wrote:So adjust the mech properly, and don't ride in granny going down bumpy stuff. Save it for steep uphills.


again - listen to him ^^

..and him ↓

felix.london wrote:On rough stuff make sure you're using the middle ring and one of the biggest sprockets on the rear. If everything is setup properly you shouldn't be losing the chain



Step83 wrote:Ill faff with the chain length tonight


And easier just to measure it properly once
"Why have that extra tooth if you're not using it?" - Brian Lopes

Votec V.SX Enduro 'Alpine Thug' 2012/2013 build

Trek Session 8

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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Mon Jul 01, 2013 16:51 pm

cooldad wrote:So adjust the mech properly, and don't ride in granny going down bumpy stuff. Save it for steep uphills.


Mech is adjusted correctly it shifts up and down both fine, unless you mean the height of the mech. Photo i found below. Im assuming it needs to come down but im not touching it till i know

Image

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felix.london
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Re: Chain device for 2X9 setups

Postby felix.london » Mon Jul 01, 2013 17:06 pm

woah dude..that doesn't look right at all!

Here's my 2x10 setup;

Image

When the mech is in the outer position it should only clear the bash guard by a couple of mm
"Why have that extra tooth if you're not using it?" - Brian Lopes

Votec V.SX Enduro 'Alpine Thug' 2012/2013 build

Trek Session 8

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The Rookie
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Re: Chain device for 2X9 setups

Postby The Rookie » Mon Jul 01, 2013 17:15 pm

Well strictly if the original 42T was there is should only clear THAT by a couple of MM.

No chain guide needed, just building what you have properly!

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Step83
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Re: Chain device for 2X9 setups

Postby Step83 » Mon Jul 01, 2013 17:43 pm

Right, so it needs lowering? I asked somewhere else (not here) and was told to leave the mech as.


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