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Description
e*thirteen Helix R 107 BCD 4-Bolt Chainring - 42t, 11/12-Speed, 107BCD, BlackThe e*thirteen Helix R 107BCD Chainring, designed for 4 bolt 107BCD cranks like SRAM Red or Force including power meter equipped cranks, offers a performance upgrade for Gravel and Road cyclists. The 38, 40, and 42 tooth rings pair perfectly with e*thirteens cassettes for more overall range and higher top speeds. Made from durable premium 7075 alloy, they're CNC sculpted for a high stiffness to weight ratio. Compatible with both SRAM and Shimano 11
The e*thirteen Helix R 107BCD Chainring, designed for 4-bolt 107BCD cranks like SRAM Red or Force including power meter equipped cranks, offers a performance upgrade for Gravel and Road cyclists. The 38, 40, and 42 tooth rings pair perfectly with e*thirteen’s cassettes for more overall range and higher top speeds. Made from durable premium 7075 alloy, they're CNC sculpted for a high stiffness-to-weight ratio. Compatible with both SRAM and Shimano 11 and 12-speed drivetrains. Chainline is set by SRAM® Crank assembly.- Compatible with 4-bolt 107 BCD SRAM® cranks and Quarq® power meter cranks
- M4 narrow-wide tooth profile provides Shimano and SRAM 11/12-speed chain compatibility (Including flattop chains), excellent chain retention, and reduced wear
- 4.8mm offset (Chainline is determined by SRAM® Crank assembly, 45mm for normal width cranks, 47.5mm for wide cranks)
- Forged from premium 7075-T7 aluminum, then extensively CNC optimized for light weight, and technical aesthetics
- Durable 7075-T7 construction for long wear-life, stiffness, and strength
Product Specifics
- Ring Position/Type: Chain Retaining Single Ring
- Tooth Count: 42
- Drivetrain Speeds: 11
- Drivetrain Speeds: 12
- Round or Oval: Round
- Chainring BCD: 107
- Material: Aluminum
- Color: Black
- Weight: 81
- Defined Color: Black
Today's Stock Status
5 Available to ship in 2-4 Business Days
UPC: Not available
EAN: 4711280340996
Manufacturer Part Number: CR4HRA-150
CR4212
183057-Q0-L
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4.5 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Gift
Format: Paperback
My granddaughter loves these books. Keeps her intrigued and gives actual facts.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 14, 2023
★★★★★ 5
No gory details.
Format: Paperback
While the “Donner Party” is a very disturbing topic from US history, I feel this book gently writes through the gory bits but keeps relevant to the suffering of those on Oregon Trail which makes this very suitable for young readers.
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Reviewed in the United States on March 8, 2021
★★★★★ 5
Engaging and Different!
Format: Hardcover
Looking for a new kid's author to try now that Harry Potter has retired to a quiet life out of the spotlight? Try Stuart Gibbs. His first novel, Belly Up, is an engaging mix of mystery, humor, and adventure (as well as lots of trivia about the animal kingdom ranging from the fascinating to the . . . well, I'll let you read the book!) The story takes place at FunJungle, a huge new zoo/amusement park filled with many colorful characters. When the not-so-loveable mascot of the park, Henry the Hippo, turns up (literally) dead one day, only 12-year old Teddy, the son of two zoo employees, recognizes that this was no random event and begins his investigation only to find himself a target.
The book is perfect for the 5th-8th grade crowd (although very enjoyable for us grown-ups who haven't quite grown up yet and still love well-crafted young adult titles). I'll definitely be following his next book (not a sequel to this but an adventure based on the Three Musketeers when they were younger) which looks like will be available this fall.
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Reviewed in the United States on May 11, 2011
★★★★★ 5
Amazing but one problem
Format: Kindle
I LOVE this book but the one problem is that there are curse words. I'm 12 and I'm aware that Stuart Gibbs curses but I feel like in this particular book he cursed a lot more than he
usually does but other than that I absolutely LOVED reading this I will get the whole series for sure! If you already have read this whole series and want to read more I highly recommend spy school ( all of them there are I believe 13 of them) and space case.
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Reviewed in the United States on February 25, 2024
★★★★★ 5
Fun for Kids of All Ages
Format: Paperback
Belly Up is a hit with my 8-year-old son, and even my 14-year-old can’t get enough of it! The story is funny, adventurous, and full of clever twists that appeal to both younger and older readers.
It’s perfect for kids who love animals, mystery, and humor — a book that keeps everyone hooked from start to finish.
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Reviewed in the United States on November 30, 2025