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Oneup 10 Speed Cassette Expander Kit
Oneup 10 Speed Cassette Expander Kit
Oneup 10 Speed Cassette Expander Kit
(72)

Oneup 10 Speed Cassette Expander Kit

Item #: CS219B00
USD$80.00
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Oneup 10 Speed Cassette Expander Kit

Please Note: Pictures are for illustration purposes only. Cassette and Rear Derailleur are sold separately.

OneUp 10 speed Cassette Expander Cog Kit

The OneUp 40/42T Sprocket is a cost effective way to extend the gear range on your 10-speed drivetrain. Compatible with both 1x and 2x drivetrains, the OneUp 40/42T Sprocket easily installs to your 11-36T or 12-36T cassette (not compatible with all 10-speed cassettes; see below for details). To install, you simply remove the 17T cog and 1 cassette spacer from your freehub to make room to slide this giant cog on –better yet, the OneUp 40/42T Sprocket now ships with a 16T cog to replace both 15T and 17T to provide more even cassette progression which results in a smoother cadence with improved shifting.

Features

  • Reaps the benefits of a 1x11 drivetrains at fraction of the cost
  • Compatible with most SRAM and Shimano 10spd component groups
  • Compatible with 1x10 and 2x10 drivetrains
  • Compatible with 8/9/10 speed Shimano HG freehub bodies
  • 16T sprocket provides smoother cassette progression for constant cadence and improved shifting
  • 12 upshift points optimized for most 11-36 cassettes
  • Uses original 28,32,36T steel sprockets for maximum durability
  • Patented (US 9,011,282) other patents pending
Specifications
new 10 speed gearing 11-13-16-19-21-24-28-32-36-40/42
Sprocket Material 7075-T6 (40/42), Chrome plated hardened steel, (16T)
Sprocket Weight 18g (16T), 70g (40T), 71g (42T)
Weight Increase 51g
Typical 3x to 1x System Weight Decrease 367g
Cassette Range Improvement 11% (40T) 17% (42T)

OneUp Cassette Expander Cog Kit Compatibility

The OneUp adapter sprocket is compatible with most 10 speed mountain setups running an 11-36T or 12-36T cassettes. That being said, please see the Compatibility Chart on OneUp's website to see if your cassette is compatible with an 40/42T Sprocket. You can view the compatibility chart by clicking HERE

4.5 / 5.0
72 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
49
18
2
0
3
not a bad product
i bought this ex-cog to convert my scott hard tail to a 1 x 10. the install was easy, and one up industries is great at replying to your questions in a timely manner.

i am running this thing with my brand new 11-36 shimano XT cassette, and the install was prett simple. it is a big jump from the 36 to the 42 tooth ex-cog and it doesnt shift as smooth as a would like, but it was expected. you also have to replace one of the cogs in your cassette with a supplied cog as well, and i still have not gotten it to shift very smooth between the shimano cogs and the installed one up cog. i am still hopeful i can dial it in.

so far, i am loving the simplicity of having no front derailleur, but you will definitely notice the gearing change. i am running a 32T front chainring and when engaged with the 42 T one up cog, you get a gear ratio of roughly 1.3, while with my stock setup, i had a 24T front and a 36T rear cog and a granny ratio of 1.5. you will notice the difference in your first ride or two during some long climbs, but if you are intrigued by simplifying your bike, this is the way to go.

PROS: Easy To Install, Attractive Design

CONS: Limited Compatibility
August 4, 2015
Location:
bay area ca
One UP rocks!
I put this extra large rear sprocket on all my 10 speed bikes as I make them all 1 x 10 , its the way to go

PROS: Attractive Design, Lightweight, Easy To Install, Durable
October 30, 2014
Location:
NJ
Great upgrade for your 10 speed cassette
I needed more "granny gear" for my 1x10 mountain bike. I run a 32 tooth chain ring and this cog gives me the extra gear I need to make my climbs. Way cheaper than going to 11 speeds, and the 16 tooth cog they include with the kit makes a much nicer gear progression. I can't recommend this product enough!

PROS: Durable, Lightweight, Extends Gear Range, Attractive Design, Easy To Install

CONS: NONE

BEST USES: Mountain Biking, Upgrade
August 26, 2015
Location:
Richardson, TX
Great product!
This is a great product, same as everything i've used from Oneup Components. Easy to install and does what it's supposed to.
April 12, 2017
Purchased
3 weeks ago
Location:
Colorado
1x10 Is Great
All the benefits of 2x10 with less weight, and only one shifter, so much better!

PROS: Attractive Design, Durable, Lightweight
March 3, 2015
Location:
Southern oregon
Likes to climb!
I mountain bike 2 to 3 times per week, I converted my 3x9 to a 1x10 the One Up set up works great, the replacement 16t is a nice bonus for easy shifting. My drive train has no problem shifting up to the 42t with a Shamono Shadow XT with a clutch. I'm running a 30t Race Face chain ring, I probably could of got away with a 32t for a bit more speed on the DH. This set up is defiantly worth the up grade, my bike is a Turner 5 Spot with DW suspension, no need for a chain stay set up.

PROS: Lightweight, Easy To Install, Durable

BEST USES: Upgrade, Mountain Biking
November 20, 2014
Location:
Carlsbad
good quality cog
Really nice cog, seems to be quality build. Installation was quite easy.
One remark however, guys from uneup components, add longer b screw with the order. I doubt it destroys your profit (it costs pennies), but it will definitely make installation much easier. Now I have to buy longer b screw from your competitors, wolf tooth as long as mine is completely stripped (reversing b screw is an option, but I prefer stock look)

PROS: Easy To Install, Durable, Attractive Design
March 15, 2015
Location:
Tbilisi
Get on up!
Excellent upgrade for a 1x10 drivetrain - have one on each of my bikes. More versatile than some of the competition in that it fits both SRAM and Shimano. Can't see why you would need 42t - 34x42 is low enough for mad wheelies every Wednesday!

PROS: Easy To Install, Versatile, Attractive Design, Durable

BEST USES: Mountain Biking, Upgrade, Racing
March 16, 2015
Location:
Melbourne, Australia
As advertised
Easy to install. It does increase the bike range as expected. Working on shifting issues that have ensued, I have a zee and the 40t.

PROS: Lightweight, Attractive Design, Easy To Install
March 18, 2016
Location:
Pacifica
Simple , and so sweet
So simple to change everything. 1x10. Made a world of difference. Just stay fit so you don't have to go back

PROS: Lightweight, Attractive Design, Easy To Install
May 8, 2015
Location:
Tri- cities wa. Nw usa

Q & A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 2 answers
I have a BMC TF03 running on a 2x10 setup.
Shimano CS-HG50, 11-36

Is this compatible? I wanted to make sure before purchasing it.
Many Thanks!
Einstein on Oct 16, 2016
BEST ANSWER: Mine was fitted to a Sram 11-36 2x 10 set up,no installation or set up issues,and have been running fine for more than a month,so compatibility is not an issue either.Very happy with the product.,it seems it is compatible with your shimano setup,go for it.
Njinga

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.