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1x 9 setup , done cheap , a few questions

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1x 9 setup , done cheap , a few questions

Old 07-12-17, 02:59 PM
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jambon
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1x 9 setup , done cheap , a few questions

Hi ,

I am looking for a few pointers and have a few questions on setting my mountain bike up as a 1x 9 .
It now has a triple raceface crank at the front .

The middle ring is a 32 . I am hoping to do this cheaply and keep that middle ring if I can . So once I have removed the front deraileur and its shifter and the other two chainrings . I will possibly have to get some single speed chainring bolts . Then I will shorten the chain somewhat .

From what I am understanding I need some kind of device to keep the chain from falling off the middle ring where it sits unsupported . I am not an overly aggressive rider , both wheels rarely leave the ground . I am mostly into trail center beginner to intermediate stuff .

a Few Questions ;

What would be the best kind of chain retention device to look out for ?

If I buy one of these chain retention devices then can i avoid investing in a new narrow wide chainring ? Or do I need both ? Or if I buy a single speed ring than i can get away without having to install the chain guide device ?

Will the chain line position that the middle ring currently has on the crank be suitable for a 1x setup or should I be looking at working it so that the middle ring is lined up with the centre of the cassette at the rear ?

Thanks for and advice,

J
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Old 07-12-17, 04:40 PM
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The cheapest chain retention device would be to keep the front derailleur on. Without the shifter attached, just the derailleur. Next would be one of those Deda chain catchers. And you may want to have a bashguard on the outside (BBG Bashguards was one of the cheapest)

If you go with narrow/wide, you can usually get the Race face rings for ~$40. Or you can try a singlespeed (no pins, no ramps) ring which won't work as well as narrow wide but may work good enough.
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Old 07-12-17, 11:18 PM
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Even with a narrow-wide, you really need a clutch derailleur or some other chain retention device.

The front-derailleur is a cheap option.
The other option is a bashguard in place of the outer ring, and a chain keeper on the inside, or making a "bash-which" with replacement inner and outer guards.

+1 for BBG, cheap, effective, and good looking.
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Old 07-13-17, 07:14 AM
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I was in the same situation as you last spring. I purchased a Raceface narrow wide chainring and had to get chainring bolts. I haven't dropped a chain or had any issues. I would say I haven't gotten too rowdy with this bike and it has since been tasked with commuting and longer gravel adventures.
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Old 07-13-17, 02:58 PM
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If you really want cheap you don't need new bolts, just use some washers.
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Old 07-13-17, 08:14 PM
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I did a conversion from 3x9 to 1x9. Well, the FD failing automatically converted that. I just took off the FD and shifter and cable and left the chain in the middle chainring, which also is a 32T like yours (have 11-32 in rear on 26" wheels with 2" tires). Works fine.

I originally left the chain the same length and once the large chainring (44T, it is a bit uneven) stole the chain from the middle chainring. I just took out 2 links (2"). This is still a bit too long according to official Park rule, but took care of the problem. So you may not need any chainguard.

I'm too cheap to buy a new BB and crank with single chainring now. If my BB fails I look into getting an external bearing crank with hollowtech or so. I really like the 1x9, much less complex. this is not my main bike, just for neighborhood and towing my daughter on her tow bike.

The only real disadvantage of keeping the large and small chainring is the weight. But the real weightsaving would come from going to hollowtech single chainring crank or similar and that is costly unless you upgrade for other reasons. Depends on what your current BB and crank is, though. Mine is oldschool.

Last edited by HerrKaLeun; 07-13-17 at 08:17 PM.
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Old 07-13-17, 08:52 PM
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Originally Posted by jambon View Post
Hi ,

I am looking for a few pointers and have a few questions on setting my mountain bike up as a 1x 9 .
It now has a triple raceface crank at the front .

The middle ring is a 32 . I am hoping to do this cheaply and keep that middle ring if I can . So once I have removed the front deraileur and its shifter and the other two chainrings . I will possibly have to get some single speed chainring bolts . Then I will shorten the chain somewhat .

From what I am understanding I need some kind of device to keep the chain from falling off the middle ring where it sits unsupported . I am not an overly aggressive rider , both wheels rarely leave the ground . I am mostly into trail center beginner to intermediate stuff.



a Few Questions ;

What would be the best kind of chain retention device to look out for ?

If I buy one of these chain retention devices then can i avoid investing in a new narrow wide chainring ? Or do I need both ? Or if I buy a single speed ring than i can get away without having to install the chain guide device ?

Will the chain line position that the middle ring currently has on the crank be suitable for a 1x setup or should I be looking at working it so that the middle ring is lined up with the centre of the cassette at the rear ?

Thanks for and advice,

J
I have converted a HT to 1x9 very cheaply going with just a bashguard in place of the big ring on the outside and an Ngear Jumpstop on the inside. I removed the small and large chainrings. This should cost you about $30 in total.

BBG Basguard, ~$20 shipped, made in the USA: https://www.bbgbashguard.com/
Ngear Jumpstop (can be found for ~$10): https://n-gear.com/

Never once lost a chain in many years of trail use.

I used a normal middle 32t chainring (was not a narrow-wide) so I would definitely try just using the 32t ring you already have. The rear derailleur was a standard (non-clutch) model. Since the bashguard is replacing the big ring, you can re-use the chainring bolts you have.

Be sure to shorten your chain. This is critical for avoiding the chain flopping around that leads to dropping the chain in the front. Use the "big-big plus one link" method described here: https://www.sheldonbrown.com/deraile...ent.html#chain (Keep in mind that the 32t ring is now your "big ring").

Chainline is fine. It is probably just a little outboard of being centered on the middle cog, but that is OK. That chainring position was intended to be usable across the whole cassette.

Here is what my 1x conversion looked like:


I used a Spot bashguard for this one, but I have bought many BBG Bashguards for 3x9 to 2x9 conversions over the years, and I think they are the way to go.

Last edited by Kapusta; 07-14-17 at 07:29 AM.
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Old 07-14-17, 09:13 AM
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Thanks Kapusta , Im in europe so gathering a bash and jumpstop is looking almost the same cost wise as a narrow wide ring , i'll give ebay a good scouring
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Old 07-14-17, 10:02 AM
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Originally Posted by jambon View Post
Thanks Kapusta , Im in europe so gathering a bash and jumpstop is looking almost the same cost wise as a narrow wide ring , i'll give ebay a good scouring
To be honest, I am not sure that a narrow-wide ring by itself is going to keep the chain on reliably without a clutch-derailleur. I would at least ask around about that specifically first on a board like MTBR where a bazzilion people have done this very thing.

Someone here mentioned that they are OK with just a narrow-wide ring, but did not mention if they have a clutch-derailleur.
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Old 07-14-17, 06:32 PM
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Originally Posted by Kapusta View Post
To be honest, I am not sure that a narrow-wide ring by itself is going to keep the chain on reliably without a clutch-derailleur. I would at least ask around about that specifically first on a board like MTBR where a bazzilion people have done this very thing.

Someone here mentioned that they are OK with just a narrow-wide ring, but did not mention if they have a clutch-derailleur.
It largely depends on your riding style. For mostly path and gravel trails, the narrow-wide works fine without a clutch. Once you start getting into rocks & roots at speed, you need a clutch derailleur or equivalent.
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Old 07-14-17, 09:50 PM
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I have two 1x bikes without clutched RDs and 1 with a clutched RD. I don't remember the clutched RD ever dropping the chain. My 1x10 non clutch has a couple times. My 1x9 non clutch is a rigid and the spring in the RD is probably a bit weak and still doesn't drop very often, generally only when I'm going fast over chattery stuff.
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Old 07-15-17, 03:31 AM
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While I am here ,

Has anyone anything to say about these very cheap chinese narrow wides on ebay ?

DECKAS Narrow Wide Bike MTB Round Oval Chainring Chain Ring Single Plate BH | eBay


They are a fraction of the price even with postage of the race face one I had been looking at
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