Lead Time Update! 6/15/22

Current lead time for most parts is still 16 weeks from the day you order, but some small parts can now ship within 2 weeks. For details on all lead times please go here. Thanks!

External T47 Bottom Bracket

$126.20$263.35

SKU: bttmbrcktexternalt47
Clear Options

Information


T47 is a bottom bracket standard that White Industries helped develop in 2016. The “T” stands for “threaded” and the “47” is the approximate outside thread diameter of the cup, in millimeters. T47 bottom bracket cups are not compatible with the much smaller BSA threaded BB shells.  The “external” designation on this bottom bracket refers to the fact that the bearings sit “outboard” of 68mm and 73mm wide bottom bracket shells, as opposed to our “internal” T47 bottom brackets where the bearings sit “inboard” of 86mm and 92mm wide bottom bracket shells.  If you have an 86mm or 92mm wide T47 bottom bracket shell on your frame, you will need one of our “internal” T47 bottom brackets to work with our 30mm M/A/R/G cranks.

White Industries external T47 style bottom brackets are made here in our shop with U.S. sourced 6061-T6 aluminum and feature Enduro stainless steel bearings or Enduro XD-15 ceramic bearings where available.  We offer them with four different bearing sizes to help you fit your favorite crank to your favorite bike.

Features

  • Comes in four bearing sizes to fit:
    • 30mm White Industries M/A/R/G cranks as well as other brands of 30mm spindle cranks
    • 29mm SRAM DUB cranks
    • 24mm Shimano HollowTech II cranks
    • GXP 22mm/24mm cranks – discontinued
  • Dust seals included with all models
  • Internal BB sleeve part #BBSLV available under Parts>Bottom Bracket Parts

Specs

  • 47mm x 1mm threads (“T47” threads)
  • Designed to be used on 68mm or 73mm wide bottom bracket shells
  • Weight/pr (with bearings and seals)
    • 30mm: 91g
    • 29mm: 99g
    • 24mm: 104g

Cup Dimensions, Spacers and Bearing Info

  • 30mm White Industry cranks
    • No spacers needed with R30 and G30 cranks on 68mm shells (73mm shells are too wide)
    • No spacers needed with M30 and A30 cranks on 73mm shells
      • On 68mm shells, use one 2.5mm T47 cup spacer on each side

See the chart below for the “OBW” (Outer Bearing Width) of each bottom bracket and compare that to the allowed OBW for your crank (ask the crank manufacturer for this, not us!).  Most cranks these days have an adjustable bearing preload collar on them that can accommodate slightly wider/narrower OBW’s than their target number, but again, you’ll need to check with your particular crank’s manufacturer.  When in doubt, start with fewer spacers than you think you need so you don’t crush and destroy your bearings!

  • If the allowed OBW of your crank is less than the OBW of our bottom bracket, our bottom bracket will not work (it’s too wide for the crank)
  • If the allowed OBW of your crank is more than the OBW of our bottom bracket, our bottom bracket will work but you may need spacers

How many spacers?

  • Other brands of 30mm cranks
    • Compare the allowed OBW of the crank to our bottom bracket OBW
      • If you are using a SRAM 30mm “narrow” spindle crank with a 68mm or 73mm OBW, you will need our “internal” T47 bottom bracket (part# BBI306873T47)
  • 29mm SRAM DUB cranks
    • Using SRAM’s charts, look at the T47 row, find your shell width (68mm or 73mm), find your crank model, then see what spacers they require
    • Our cups w/seals add 2mm in overall width (1mm for each cup/side) compared to SRAM DUB BB cups, so subtract 1mm from each side of SRAM’s spacer numbers
      • If SRAM calls for no (zero) outer/spindle spacers on the non-drive side (left), you may have to subtract 2mm from the drive side (right) to make things fit
          • Ex: If SRAM calls for 3mm of spacer on the right and zero on the left, run 1mm on the right and zero on the left.
  • 24mm Shimano HollowTech II cranks
    • Shimano road BB cups are the same width as our cups
    • Shimano mountain BB cups are 1mm narrower than our cups so you may need to add a 1mm axle spacer on each side when using a Shimano mountain crank

 

External T47 BB Model

Spindle Diameter Fits Cranks Cup Width (w/seals) Outside to Outside Bearing Width on 68mm/73mm BB Shells Enduro Stainless

 Steel Bearing

Enduro XD-15 

Ceramic Bearing

L

R L

R

BBE30T47

30mm White Industries MR30 Etc. 11.5mm 91mm/96mm 6806 6806 6806XD

6806XD

BBE30T47HD

30mm White Industries MR30 Etc. 11.5mm

(no seals)

91mm/96mm (no seals) 6906 6906 N/A

N/A

BBE29T47

29mm SRAM DUB 12mm 91mm/96mm 6806/29 6806/29 6806/29XD

6806/29XD

BBE24T47

24mm Shimano HollowTech II Etc. 11.5mm 91mm/96mm 2437 2437 2437XD

2437XD

BBE22T47 – discontinued

22mm/24mm stepped SRAM GXP Left: 12mm

Right: 11.5mm

91.5mm/96.5mm 22378 2437 N/A

2437XD

 

Tools

BBE22T47** – discontinued

T47 threads, external cups,

GXP 22mm/24mm spindles

16 notch/44mm

or

16 notch/52.2mm

Park BBT-9

Park BBT-19.2

Park BBT-69.2

Abbey Tools BB Common

Enduro TorqTite spanner

Shimano TL-FC33

BBE24T47**

T47 threads, external cups,

24mm spindles

16 notch/44mm

or

16 notch/52.2mm

Park BBT-9

Park BBT-19.2

Park BBT-69.2

Abbey Tools BB Common

Abbey OSB “TT”

Enduro BBT-015

Enduro BBT-025

Enduro TorqTite spanner

Shimano TL-FC33

BBE29T47

T47 threads, external cups, 

29mm spindles

12 notch/46mm

 or

16 notch/52.2mm

Abbey OSB “TT”

Abbey BSA30

*Park BBT-47

Park BBT-79

*Enduro BBT-025

Enduro TorqTite spanner

Race Face Cinch spanner

BBE30T47

T47 threads, external cups, 

30mm spindles

12 notch/46mm

 or

16 notch/52.2mm

Abbey OSB “TT”

Abbey BSA30

Park BBT-47

Park BBT-79

Enduro BBT-015

Enduro BBT-025

Enduro TorqTite spanner

BBE30T47HD

T47 threads, external cups, 30mm spindle, heavy duty 30mm bearing 16 notch/52.2mm Abbey OSB “TT”

Park BBT-47

Enduro BBT-025

Enduro TorqTite spanner

*  The bearing “pilot” on these tools is smaller than the bearing on this bottom bracket so the tool will work but will function like a socket-type tool, without the added stability of the bearing pilot

**Some older versions use a 16 notch/41mm outer spline and work with the Park BBT-59.2 tool

Torque

  • Cups on frame: 26-37 ft lbs (35-50 Nm)

Techical Documents

Additional information

Weight N/A
Dimensions N/A
BB Spindle Diameter

24mm, 29mm, 30mm

BB Shell Width

68mm/73mm

Bearing Type

, ,