Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

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qwertyas
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Joined: 21 Nov 2020, 5:41pm

Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby qwertyas » 21 Nov 2020, 6:04pm

Hello everybody

I did a project for my son, who wants to try cyclo-cross this winter (coming from MTB - XC): on his hybrid/road bike, which has an 105 transmission, with the Shimano 5800 crankset (50-34 teeth) I removed the bigger, outside chainring and turned it into an 1x setup. It works all right, but since I kept the the chain a bit longer (so that I don't need to add links or change the chain, were I to turn to the 2x setup) there is a risk that the chain goes off. I thought of replacing the inner chainring - which is the standard Shimano 105 - 5800, with a narrow-wide one. But it seems I cannot find any brand doing this kind of thing.
I don't want to change the crankset - so do you happen to know of chainrings that:
- are 34 teeth;
- have a narrow-wide profile;
- fit the 105 (Shimano 5800) inner chainring dimensions (that is 4 screws, bcd 110, if I got these right?).
Any suggestion/commentary/alternative approach is more than welcome.

P.S. As you can probably see, English is not my native language, nor my technical knowledge in bikes is very advanced. I hope I've made myself clear. I'm also a fist timer on this forum, I did a bit of search and couldn't find the topic already addressed.
Alex.

Cyril Haearn
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Joined: 30 Nov 2013, 11:26am
Location: Leafy suburbia

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby Cyril Haearn » 21 Nov 2020, 6:41pm

What is a narrow-wide chainring? Your cycling-English seems good enough :wink:
Entertainer, intellectual, idealist, PoB, 30120
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we hate bullies

KM2
Posts: 549
Joined: 23 Oct 2008, 5:38pm

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby KM2 » 21 Nov 2020, 7:29pm

It’s specifically for the narrow then wide sections of a chain. Very specific positioning of chain on the ring.

You perhaps need a clutch rear gear to prevent chain slap.
Or cut teeth of old chainrings to flange the ring you have. Need longer chain bolts and maybe longer bracket???

Cyril Haearn
Posts: 14543
Joined: 30 Nov 2013, 11:26am
Location: Leafy suburbia

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby Cyril Haearn » 21 Nov 2020, 7:41pm

Looked at some pictures, a chainring with alternative narrow and wide teeth
What happens if one puts the chain on wrongly, narrow gaps on wide teeth, if that is possible?
Entertainer, intellectual, idealist, PoB, 30120
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we hate bullies

KM2
Posts: 549
Joined: 23 Oct 2008, 5:38pm

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby KM2 » 21 Nov 2020, 7:54pm

You wouldn’t do that would you???
The teeth fill the gaps.


User avatar
Redvee
Posts: 2306
Joined: 8 Mar 2010, 8:58pm

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby Redvee » 22 Nov 2020, 1:36am

I run a Race Face NW chainring on my Shimano road chainset 110bcd but the smallest I've seen is 38t.

NickJP
Posts: 300
Joined: 24 Sep 2018, 7:11pm

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby NickJP » 22 Nov 2020, 7:48am

You could always just leave the front derailleur in place and screw the limit screws down so that it's in a fixed position. That should prevent the chain jumping off.

Jdsk
Posts: 3772
Joined: 5 Mar 2019, 5:42pm

Re: Narrow-Wide 34 teeth inner chainring, for 4x110 BCD - Shimano 5800 (105 crankset)

Postby Jdsk » 22 Nov 2020, 8:38am

Welcome, Alex.

Cyril Haearn wrote:What is a narrow-wide chainring?

KM2 wrote:It’s specifically for the narrow then wide sections of a chain.

Cyril Haearn wrote:What happens if one puts the chain on wrongly, narrow gaps on wide teeth, if that is possible?

KM2 wrote:You wouldn’t do that would you???
The teeth fill the gaps.

Exactly.

Narrow Wide Chainrings Guide (Everything You Need to Know!)
https://www.worldwidecyclery.com/blogs/worldwide-cyclery-blog/narrow-wide-chainrings-guide

Jonathan