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Oneup Components X-Cog Cassette Expander

Item #: CS212B02
USD$90.00
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Oneup Components X-Cog Cassette Expander

OneUp Cassette Expander 44T Cog Kit

Extend the life and range of your 10-42T cassette by replacing the aluminium 42T with the X-cog 44T sprocket. If you spend a lot of time in the 42T Cog it can wear out the Aluminum sprocket faster than the rest of their steel cassette. Instead of throwing tossing a $400 cassette that’s mostly still good, slap on the new 44T and get rolling again for much less. The X-Cog provides more range, not just an easier granny gear. The increased range is a must for enduro and stage racers. Maximize the chainring size for timed downhill sections, while still being able to conserve energy on transition stage climbs.

Features

  • Compatible with: SRAM XX1 and X01 (Not compatible with X1 or GX fully pinned cassettes)
  • 8 optimized upshift points
  • Press fit design ensure ease of assembly (no loose spacers)
  • Full spline width prevents gouging damage to freehub
  • Sprocket material: 7075-T6 Aluminum
  • Sprocket weight: 100g (44T)
  • OneUp adapted cassette weight increase: 15g
  • Cassette range improvement: 4.8%
  • Colors: Black, Green
4.1 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
4
2
0
0
1
Leg Saver
My XX1 42t cog wore out while the entire cassette was fine. Glad they made this replacement or I would be out of luck.

Just in time for my trip to Cali where there are 3-5000 feet climbs where my legs won't be use to. So to save my legs I will run my 30T and this 44T to make life a bit easier when riding out there. Once I head back to my local trails I will run a 32T front. The ratio will be similar to running a 30T-42.

Install was cake, I used a big set of pliers to press them in together, otherwise very straightforward.
May 10, 2016
Location:
Edison, NJ
Fantastic upgrade
I damaged two teeth on my x01 cassette in a crash, and was looking at having to spend another pile of money on a replacement cassette, or to constantly remember not to shift into my easiest gear. Luckily right around when this happened, OneUp released this expander cog. I had my bike shop install it for me, and it works great. Shifting into it is flawless, but shifting down to the second biggest gear is a bit of a drop. It doesn't affect performance much, but you do hear the chain physically flop down onto the next set of teeth. It's been almost two years since, and my drivetrain is still going strong!
March 12, 2017
Location:
Vancouver, BC
Perfect for 1x
A little lower gearing is a big plus on the climbs.
March 26, 2017
Purchased
6 months ago
Great design, but not perfect shift quality.
Great product and the lower gearing is awesome. The shift quality isn't perfect, but it's acceptable, especially to get some low end grunt.

PROS: Attractive Design, Easy To Install, Lightweight

CONS: Shifting Isn't Perfect
March 9, 2016
Location:
Missoula
One up cog
Nice

PROS: Lightweight, Easy To Install, Attractive Design
September 22, 2015
Location:
Vegas
Oneup X-Cog
So far, so good. I've used it on a handful of rides and climbing is a bit easier, although I'm not sure if that's because of the other components I've added to my bike. This cog is an easy install and it's great not having to spend a ton of money on a whole new cassette.
August 3, 2016
Location:
San Bruno, CA
Disappointed
I installed this X-Cog on a SRAM XO-1 cassette. I tried it first with a Shimano XTR 11 speed derailleur and shifter, and then switched to a SRAM XO 11 speed derailleur and shifter. I also tried longer and shorter chain lengths. No matter how much I fiddled with the cable adjustment, and B-screw adjustment, I could not get it to shift up onto, or down off of the X-Cog without a struggle. I had to dial in extra limiter screw travel so I could give the shifter a little extra push and hold it to go up onto the X-Cog. To shift down off it I had to go 2 clicks on the shifter, and then back up. (44 to 32, then back up to 36.) I've never had trouble getting things smoothly on any SRAM or Shimano cassette. I finally gave up on it and went back to the stock 10-42 XO cassette. It works perfectly. Either this thing doesn't work very well, or I just don't know how to make it work.
July 15, 2016
Location:
Phoenix, Arizona

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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.