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Oneup Components Shimano 47T Expander
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Oneup Components Shimano 47T Expander

Item #: CS191B00
USD$90.00
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Oneup Components Shimano 47T Expander

Oneup Components Shimano 47T Expander

Do you find yourself in the midst of a killer steep climb, and you’re pushing on the thumb paddle of your rear shifter searching for one more gear only to find that you’ve already maxed out? Just one more lower gear could be the difference between pedaling to the top or having to shamefully dismount and push your bike to the peak. Oneup doesn’t want you to experience such shame. They know the limitations of stock gearing and provide solutions for every rider, and every condition. You can Oneup your current Shimano 11 speed drivetrain with the 47T sprocket for SLX/XT (M7000/M8000) 11-42T cassettes. Why bother when Shimano make an 11-46T cassette? The 11-46T has a huge, clunky 9T jump from 37-46T meaning that the shift to the biggest sprocket feels like a shifting into a granny ring. Adding Oneup’s 47T sprocket to the Shimano 11-42T cassette gives you 5T jumps in the bigger sprockets - 37-42-47T - making the lower gears extremely useable. The 47T requires no derailleur cage modifications, so it’s a quick and easy install.

Features

  • 18T sprocket provides more even cassette progression for smoother cadence and improved shifting
  • Maintains the 42T as the smallest alloy sprocket preventing premature drivetrain wear. No major drivetrain manufacturer goes smaller than 40T in alloy.
  • Compatible with M8000/M7000 GS (med cage) and SGS (long cage) derailleurs
  • Uses standard freehub driver bodies (Not XD)
  • 10 upshift points
5.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
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1 Stars
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Sweet spot
My '17 trek fuel ex 9.8 came XT 2x. Was previously on a 1x, but was certainly enjoying the low gearing of the 2x. The 50t shark with the derailleur mod seemed nice, but I didn't want to mod the derailleur if not needed and then I discovered the 47t! I mated it to a 32 Absolute Black oval. Can climb everything and still have enough top end. Very happy with this set up.
April 4, 2017
Purchased
6 months ago
Location:
Yucaipa ca
Nice to have an extra helper.. HAHA!!!
Nice fit and finish I noticed a small glitch in the 18 tooth cog when shifting, but I am still getting the derailleur adjustment nailed down...
Liking the transition from the 42 to the 47tooth
Liking the transition from the 42 to the 47tooth
July 26, 2017
Purchased
2 months ago
Location:
Yucca Valley, CA
Great upgrade
I installed this to my 11-42 XT cassette to get some more low gear range and this 47T cog fit the bill perfectly. Shifting has been very smooth with only a 5 tooth jump from the 42 cog. Just make sure you have a medium or long cage derailleur. I was also able to use my existing chain without any modifications to length.
September 15, 2017
Purchased
2 weeks ago
Location:
San Carlos, Ca
Shifts just like my shimano xt
I have a shimano xt 11-42 cassette with medium cage rd and wanted a bail out gear. Had jenson install the expander cog . Straightforward install and i didn't have to change my chain. Shifts pretty smooth. Kudos to the shop at jenson corona for being helpful!
Oneup 47t in Shimano XT 11-42 cassette
Oneup 47t in Shimano XT 11-42 cassette
April 9, 2017
Location:
Irvine

Q & A

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Browse 1 question Browse 1 question and 1 answer
Are you planning on ever offering this in other colors? Or at least black?
Darren on Sep 9, 2017
BEST ANSWER: Mine came in a black finish. Added it to my 42 cassette and it works great on my pivot trail.

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Get free shipping with your $50 purchase today when you choose Standard Shipping at 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

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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.