SRAM DUB English BSA Bottom Bracket - 68/73mm | MTB Boost

SRAM DUB English BSA Bottom Bracket - 68/73mm | MTB Boost SRAM

SRAM DUB English BSA Bottom Bracket - 68/73mm | MTB Boost

SRAM DUB English BSA Bottom Bracket - 68/73mm | MTB Boost

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What sets the SRAM DUB Boost Bottom Bracket apart from standard DUB?

The DUB spindle is SRAM's single oversized spindle standard, built to work across every bottom bracket shell so crankarm compatibility stops being a guessing game. What separates this one from a standard DUB bottom bracket is the chainline it is built around: 55 mm, for SRAM Boost mountain cranksets. Gutter Seal Technology and sealed cartridge bearings handle the part of the job that actually ends bottom brackets, which is water and grit working their way in. Chainline is worth getting right, because a mismatched setup will still turn but it runs noisier and wears faster than it should.

It threads into an English/BSA shell at either 68 mm or 73 mm, so one part covers both common threaded MTB widths. Match it to a SRAM DUB crankset running a 55 mm chainline. Eagle Transmission T-Type cranksets use that same 55 mm figure, so this is often the bottom bracket that pairs with a T-Type build, though you should confirm your crankset's chainline rather than assume it. If your crankset is a standard Boost DUB at 52 mm, the standard version is the one you want instead.

$45.00
$45.00
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more details:

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Specifications

  • Spindle Standard: DUB
  • Shell Type: English/BSA threaded
  • Shell Width: 68mm or 73mm
  • Chainline: MTB Boost, 55mm
  • Shell I.D.: 1.37 inch
  • Bearings: Sealed cartridge
  • Sealing: Gutter Seal Technology
  • Application: MTB Boost
  • Compatible Cranks: SRAM DUB Boost cranksets running a 55mm chainline
  • UPC: 710845857911

FAQ

Is this the 52mm or the 55mm chainline DUB bottom bracket?

This is the 55mm chainline version, built for SRAM Boost mountain cranksets that run a 55mm chainline. SRAM also makes a 52mm standard Boost bottom bracket, and the two are not interchangeable. Check the chainline your crankset calls for before ordering.

Does this bottom bracket fit both 68mm and 73mm shells?

Yes. It threads into an English/BSA shell at either 68mm or 73mm, which covers both of the common threaded mountain bike widths. Measure your shell between the inside faces if you are not certain which one your frame uses.

Is this the right bottom bracket for a SRAM Eagle Transmission T-Type crankset?

Eagle Transmission T-Type cranksets run a 55mm chainline, which is what this bottom bracket is built for, so on an English/BSA frame it is usually the correct pairing. Confirm the chainline listed for your specific crankset first, since SRAM builds DUB bottom brackets in several chainline configurations.

What does Gutter Seal Technology do?

Gutter Seal Technology improves how the bottom bracket seals against water and dirt. Bottom brackets almost never fail because the bearings wore out from riding, they fail because contamination got past the seals, so the sealing design is what determines how long it lasts.

What tool is needed to install it?

A standard external bottom bracket wrench for BSA threaded cups. The drive side uses left-hand threads and the non-drive side uses right-hand threads, which is the normal English/BSA convention.

Best For

Mountain bikers on English/BSA threaded frames running a SRAM DUB Boost crankset at a 55mm chainline, including most Eagle Transmission T-Type builds, who want the sealed replacement rather than a generic aftermarket cup.

Questions About This One?

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