Information

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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 anglular contact bearings or Enduro XD-15 ceramic radial 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
  • Seals should sit directly against the bearings, with the part numbers (molded into the seal) facing out
• 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
    • SRAM DUB road crank spacer chart
    • SRAM DUB mountain crank spacer chart
  • 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
  • Our cups are the same width (each) as Shimano road BB cups
  • Our cups are 1mm wider (each) than Shimano mountain BB cups but are compatible with Shimano mountain cranks

 

 

Tools

•  Ff you have a choice, purchase/use the tool that fits the smaller of the two spline patterns.  This allows for better engagement of the tool on the cup and will help prevent tool slippage

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-79-79.3 *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-79-79.3 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” 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)

Technical Documents

• MR30 Crank and Bottom Bracket Compatibility Chart
• Bottom Bracket Tool Compatibility
• MR30 Crank Assembly