Installing OneUp Components’ New 16 Tooth Cog

Words Morgan Taylor
Photos Morgan Taylor
Date Apr 6, 2014

Following up on their popular 42 tooth cog upgrades for 10-speed cassettes, OneUp Components has introduced a 16 tooth cog to smooth out the gap created by removing a cog lower down on the cassette.

The 16T cog will ship FREE with all 40 and 42 Tooth Sprocket orders moving forward, and will soon be available for purchase separately. OneUp sent us a sample of the new 16 tooth to install with their 40 Tooth Sprocket.


OneUp’s 16 tooth takes the place of the 15 and 17 tooth cogs on a 10-speed cassette, decreasing the large jump created by removing a cog to fit the 40 or 42 tooth.

Since I’m on a math kick right now we might as well have a look at that. Without the 16 tooth option, riders were removing either the 15 or the 17 from their cassette. For background, here are the jumps between those cogs:

13-15 = 15.4%
15-17 = 13.3%
17-19 = 11.8%

Removing either the 15 or the 17 results in the following jumps:

13-17 (15 removed) = 30.8%
15-19 (17 removed) = 26.7%

As people have found in practice, either of those 4-tooth jumps are huge and you have to make a compromise to get the big 42 at the top of the cassette. OneUp’s 16 tooth gives us:

13-16: 23%
16-19 = 18.8%

So while these are still larger jumps than a stock cassette, the 18.8% is pretty manageable considering cogs at the easier end of the cassette have 16.7% jumps.


The 16T is machined from hardened steel and then chrome plated, and will work with both Shimano and SRAM systems.


The OneUp 16T has shift ramps to ensure smooth operation, which means you need to clock the cog differently depending on your drivetrain. Two dots and an “SH” go over the large spline gap on Shimano as seen here, one dot / “SR” indicates how to install for SRAM.


The OneUp system added 52 grams to this setup.


Nestled in amongst its neighbours.


The 16T does a good job of blending in.


As you can see, the general shape of the cassette with 16T installed doesn’t give you the feeling it’s missing a tooth.


The OneUp 16 tooth 40T Sprocket is paired here with a 10-speed 11-34 cassette, which was an experiment on our part that didn’t work out; both of OneUp’s wide range cogs are intended to be used specifically with 36 tooth cassettes. The compatibility page doesn’t lie.


One last beauty shot before this one gets dirty.

OneUp’s 16T cog will initially be shipped – free – with 40T and 42T orders, but will be available separately for $15 when existing orders are sorted out. OneUp is still selling out of big cogs as soon as they can make them, and the 16T is a great addition to the product offering. Check our ride review on the OneUp 42 Tooth Sprocket HERE and get yours at OneUp Components.

Are you running a big cog yet? Will the 16T convince you to make the leap?

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Bruce Mackay  - Nov. 2, 2014, 1:08 a.m.

Hey Morgan. I too crunch # in my head while riding road, glad I'm not the only one. The 16 tooth cog makes this a viable option. I keep wondering why SRAM felt a new carrier was necessary? Yeah to fit 10t, but as you point 1x is a bit of a compromise. Harden the feck up! Run 2t more up front, has a greater effect. BTW 13 -16 is 18.8% based on your other math (diff / larger cog). SRAM would sell WAY more 1×11 if we all didn't need new wheels and a $280 cassette to do it. I would switch NOW. for eg : 11-13-15-17-20-23-26-30-34-38-42. Just saying tight ratios too. With a 30 front that almost equals 32/24. Beginner gearing. 11-13-15-18-21-24-28-32-36-40-44. We could discuss ad infinitude I'm sure. What does it come down to for me. I'm waiting one more year for my next bike b/c, you're right, this will make riding easier for beginners.


Morgan Taylor  - Nov. 2, 2014, 8:30 a.m.

Good points there Bruce. SRAM has committed to the XD driver, but your ideas could be part of Shimano's trickledown.


jojo  - April 22, 2014, 8:54 p.m.

Or drop the 11 tooth and just use a 12t lock ring from token.


Matthias H.  - April 9, 2014, 1:21 a.m.

15$… meanwhile, you can get a 16t cog from shimano for 4.50 eur


Morgan Taylor  - April 7, 2014, 7:41 p.m.

I see a lot of complaining about a thoughtful supporting product that has been
brought to market to help solve one of the issues with the innovative 42
tooth 10-speed idea. The 16T is a great addition to the 40 or 42, but as has been proven for the past few months, you don't NEED it to gain the advantages of the big cog.

From what I can tell online over the past couple days, OneUp does have some sort of plan in place for its existing customers – yet people are lambasting them without sending a polite email to customer service? That's just poor form; would you do that at your local bike shop? What difference is it that this is an online-only company?


Mihr Cycles  - April 7, 2014, 8:26 p.m.

I sent them a polite email and got a chain letter response back…. something is in the works for early adopters, but no exact dates given.


OneUp  - April 12, 2014, 1:33 p.m.

Hey Mihr, our existing customer 16T deal is almost sorted for you guys. We're now in the process of setting up the back end on our website. Announcement coming soon on our Facebook page. We'll also be emailing everyone again that got in touch.
Cheers OneUp


Mihr Cycles  - April 12, 2014, 4:32 p.m.

Cool… thx!


Marshall Willanholly  - April 7, 2014, 7:19 p.m.

I think it blows that the early adopters now have to pay extra and wait an additional month for the 16t cog. The article on Bike Rumor says the 16t cog won't be shipping until May.


uly  - April 14, 2014, 7:54 p.m.

I ask one up if those of us who pre ordered would be able to get the 16t and they sent me a discount coupon to get it for half price $7.50. But I probably won't get it till may though.


Cr4w  - April 7, 2014, 4:37 p.m.

It better come in green!


Riley  - April 7, 2014, 3:47 p.m.

So what cog does this 16t replace?


Morgan Taylor  - April 7, 2014, 5:01 p.m.

Both the 15 and the 17.


Andy Ndv  - April 7, 2014, 2:01 p.m.

Or you can just remove the 11 or 12 tooth cog. I'd go for the 12 tooth.


Antony Bailey  - April 7, 2014, 5:37 a.m.

agree with the other comments. those who already purchased one should be given access to the new 16T - whether it be for free on at a discount.


Brennan  - April 6, 2014, 9:13 p.m.

Yeah, I sent an email. Mine arrived on Wednesday, rode it today, liked it but noticed the jump from 19 - 15. I would love to see access to the 16t for those who have already purchased.


Jan G.  - April 6, 2014, 7:45 p.m.

And what about the people who already bought one? Do we get a discount or something and how long will we have to wait till we can get one?


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