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Price
$430.99
KMC Bosch Gen 4 Super Narrow Chainring, Black, 38T, Chainline 50.0mm โ€” image 1
ChainringsKMCโœ“ In stock

KMC Bosch Gen 4 Super Narrow Chainring, Black, 38T, Chainline 50.0mm

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$430.99

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About this item
  • Suitable for Bosch Gen 4 Performance Line CX and Performance Line Speed from MY2020
  • Designed to work seamlessly with KMC e-bike chains, pair with an appropriate KMC e-bike chain to achive a minimum of 3500km
  • Compatible with all 1-8 speed chains (1/2 x 3/32") and all 9-12 speed chains (1/2" x 11/128")
  • Chainline: 50.0mm
  • Direct Mount, 7.0 mm offset
Product description

KMC Bosch Gen 4 Super Narrow, 38T, Chainline 50.0 mm KMC created the ""Chain Mate"" where the chainring roller seats between teeth are matched to chain rollers for exceptional component engagement. Made of High Tensile Steel, the Chainring structure enhances retention with an optimized tooth design to hold the rollers in place, significantly preventing chain drop while also reducing friction associated with traditional narrow/wide designs. In addition, the teeth are vertically asymmetrical to avoid interference while at extreme chain angles to the cassette. These chainrings from KMC are suitable for Bosch 4th generation motors. Use in combination with a suitable KMC to ensure a minimum of 3500km life span. Longer lasting, quality material and unparalleled gear changes. Designed specifically for Bosch 4 Systems Hardened CrNo steel Maximum efficiency, saves battery Extreme durability, highest precision Simple conversion Size: 1/2"" X 11/128"" Treatment: Hardened Chromoly steel Direct Mount: 7.0mm offset Perfectly matched to KMC chains (e1, e12, e11, e10, e9 and e8 chains)

Product details
Brand
KMC
Manufacturer
KMC
Material
Hardened CrNo steel
Colour
Black
Size
38T, Chainline 50.0mm
Model number
BFCB45038
Part number
BFCB45038
EAN
8719189051957

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What customers say about Bigamart

10 Trustpilot reviews total, with 2 shown at a time.

Trustpilot
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Excellent
4.5 average rating
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S
Sigalit
๐Ÿ‡ฎ๐Ÿ‡ฑ ยท January 2026
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I wrote to Bigamart's customer support and they accompanied the process of reshipping the item until it finally arrived. I felt a genuine effort to solve the problem till it was finally solved.

V
Verified buyer
๐Ÿ‡ฆ๐Ÿ‡บ ยท November 2025
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The package was here in Australia from England in a few days โ€” so quick! Something was missing and they refunded it straight away. Pretty happy with these guys.

Showing 1โ€“2 of 10 reviews

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