OneUp Introduces 40 Tooth 10-Speed Cog

Date Mar 10, 2014

OneUp Components is staying one step ahead of the competition with the introduction of a 40 tooth cog that works with the vast majority of 10-speed derailleurs. They haven’t been able to keep their 42 Tooth Sprocket in stock since it became available just a couple months ago. From OneUp:

Building on the success of our 42T we’ve decided to add a 40T sprocket to our line.  This has been specifically designed to run with Zee FR and Saint derailleurs. Our new 40T will work with Zee FR and Saint with the mode converter in Freeride mode, on most bikes, excluding full suspension bikes with more than 25mm of chain growth.  Bikes with high chain growth running Zee FR/Saint do not have enough chain capacity to allow for full rear travel when in the 40T.


The new 40T has all of the same tried and trusted features as our 42T. It’s compatible with most Sram and Shimano 10X rear derailleurs, no need to be limited to just one drivetrain company.  It’s machined from 7075-T6, weighs in at 70g and has 8 upshift points and costs $90 including shipping.

We don’t recommend our 42T be used with Zee FR/Saint.  But for all other riders not running these we still recommend the 42T to maximize your usable gear range.


The only customer complaint we’ve had with our 42T sprocket is that we can’t make them fast enough! With this in mind we will have stock of the new 40T in all our warehouses (USA, UK and Canada) on or before Mar 17th. Shipping is free worldwide.


We can now also recommend that our 40/42T sprockets can be used with both SLX HG81 and 1080 cassettes. Check out our updated compatibility page for full details.

OneUp’s 42 tooth cog has been quite the popular item, and now we’ve got another choice. Which would you go with?

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boot  - March 10, 2014, 11:31 p.m.

Finally I'm in… simple, short cage Saint.


Daniel Shaw  - March 10, 2014, 6:53 p.m.

Still dont get why you cant just beef your legs a bit and run a 36 cog.


mightyted  - March 10, 2014, 1:15 p.m.

Had my OneUP 42T cog installed last week with my single ring RF narrow wide set up (Cove G-spot).Geoff at Cove did a great job. Shifting is smooth . I've had 2 rides up Old buck with it. Never looking back.

A $100 alternative to an $1100 11 speed drive train makes a lot of sense.


slimdog  - March 10, 2014, 12:07 p.m.

Shipping is free taxes is extra.


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