Man! excellent explanation. Precise and straightforward. Thank you very much Maybe some backup pictures with the measurement of the shell would have been even better.
I have a T47/68 BB shell on a frame I’m building up. Your explanation took the headache out of either needing an inboard or outboard BB so thank you 🙏🏻
Excellent explanation to help understand the complex world of BB's. I'm planning move out of my tree's bikes with BB90 to a more reliable one and T47 is in my bucket list.
Can you please advise which is better for a titanium frame with Ultegra Di2, BSA threaded BB shell or T47 treaded BB shell? Is it worthy to "upgrade" for T47 BB shell when selecting titanium frame?
I've got a T47 30i ceramic bottom bracket with FSA SL-K Modular Super Compact BB386EVO Crankset 165mm 30/47 tooth. I need to replace my T37 30i. What fit kit do I need to purchase? Thanks!
hi there I am now new to T47 standards, all my bikes has been using bb86 or bb386 pressfit, now I am into a new frame for gravel which use t47, the brand did not specific shield width however ( I am not sure if it is a 68mm or 86mm ) , some BS has a limited stock of BB for dub sram where I live, I will set up a 2x force wide crankset on this frame ( Aurum brand, Manto gravel model), I got the dub road/road wide T47 / 68 , should fit or should not? Or would I need in T47 as mentioned?
Spacers are used to adapt BB's/cranks to each specific frame. There are BB cup and crank spindle spacers which can be used to adjust the spindle position to add extra clearance, or to fine tune chainline. Here's some links for Chris King and White Industries recommendations. Chris King cdn.shopify.com/s/files/1/2920/2114/files/bb_fit_guide_r1.pdf?v=1632265266 White Industries MR30 www.whiteind.com/wp-content/uploads/2021/02/White-Industries-MR30-Crank-and-Bottom-Bracket-Compatibility-Chart-V1-Sheet1.pdf
Note, presenter briefly mentions "BSA" threads. There's no such thing, what you mean is BSC (British Standard Cycle). BSA was a brand a long time ago, like a hundred years ago, stood for Birmingham Small Arms. Since then many people and even companies have gotten these confused, for example I have Nervar cranks that say BSA on them referring to the pedal thread. They just mean English, as in "not French" pedals. Maybe once enough people are using it wrong, it becomes the new right? Oh well it's moot now. I'm just glad I'm old and have enough BSC shells and cranks that fit 'em that I will never have to touch one of these dumb modern "improvements" that exist only to make older standards obsolete, so you have to buy new stuff. Resist!
I have a 2021 Trek Domane with a T47 BB. The shell is 73mm. I have a SRAM RED eTap AXS groupset that I plan on installing on it but I just realized the crankset is a GXP which has the 24/22 step. So would I need an Internal or external BB?
Please define a T47 BB. How did it get the name ? Personally I will be fitting a RITCHEY Cross Crank to a RITCHEY Logic Roadie. Currently the old school internal is fitted. Kellan will know as he has a Road Logic. AVT my parts shop for a while. Good Vid otherwise. Maybe T47 means external. ?? cheers.
A T47 bottom bracket shell is threaded with a 47 x 1mm thread, and comes in a variety of lengths ranging from 68 to over 100 mm. It's confusing because it can be used with all sorts of different crank standards (including BB30, PF30, DUB, 24mm, 22/24mm stepped GXP, and a variety of other 30mm standards) ALL DEPENDING ON THE WIDTH OF THE T47 SHELL. Finally T47 just refers to the bottom bracket shell and the type of bottom bracket that it takes. But the T47 bottom brackets come in both INTERNAL AND EXTERNAL VERSIONS, as explained in the video. This is one of the reasons that it can be extremely confusing! The video tries to explain all of this in a succinct way, but that doesn't mean that it covers all of the options and it doesn't address all of the possible points of confusion. Does that help answer your question?
Man! excellent explanation. Precise and straightforward. Thank you very much Maybe some backup pictures with the measurement of the shell would have been even better.
I have a T47/68 BB shell on a frame I’m building up. Your explanation took the headache out of either needing an inboard or outboard BB so thank you 🙏🏻
Excellent explanation to help understand the complex world of BB's.
I'm planning move out of my tree's bikes with BB90 to a more reliable one and T47 is in my bucket list.
Can you please advise which is better for a titanium frame with Ultegra Di2, BSA threaded BB shell or T47 treaded BB shell? Is it worthy to "upgrade" for T47 BB shell when selecting titanium frame?
Can Campagnolo Veloce Crank with 25mm width spindle installed on t47 BB ?
Yes, but you will need a 25mm BB to match. Possibly something from Campy or Ceramicspeed.
Cervelo and Factor have BBrignt T47 now, internal on the non-drive side, and external on the drive side also referred to as T47a.
Thanks for this. You gave us some good info.
Does SRAM make DUB T47 for 73mm shells? And would that be an external or internal bearing? Thanks
good information, one question, have bikes been made that require t47 bottom brackets that have 68 or 73 mm shells?
Absolutely. Those frames normally require an External T47 BB.
I've got a T47 30i ceramic bottom bracket with FSA SL-K Modular Super Compact BB386EVO Crankset 165mm 30/47 tooth. I need to replace my T37 30i. What fit kit do I need to purchase? Thanks!
Fit Kit #5 for 30mm spindles.
What are the advantages of internal bearings vs external bearings if there is any.
The main difference, is that they are designed for different width BB shells.
hi there I am now new to T47 standards, all my bikes has been using bb86 or bb386 pressfit, now I am into a new frame for gravel which use t47, the brand did not specific shield width however ( I am not sure if it is a 68mm or 86mm ) , some BS has a limited stock of BB for dub sram where I live, I will set up a 2x force wide crankset on this frame ( Aurum brand, Manto gravel model), I got the dub road/road wide T47 / 68 , should fit or should not? Or would I need in T47 as mentioned?
Most frames like that would use an external BB. It may be easiest if you can measure the frames BB shell to confirm which size your frame uses.
When do you need spacers and how are they used?
Spacers are used to adapt BB's/cranks to each specific frame. There are BB cup and crank spindle spacers which can be used to adjust the spindle position to add extra clearance, or to fine tune chainline. Here's some links for Chris King and White Industries recommendations.
Chris King
cdn.shopify.com/s/files/1/2920/2114/files/bb_fit_guide_r1.pdf?v=1632265266
White Industries MR30
www.whiteind.com/wp-content/uploads/2021/02/White-Industries-MR30-Crank-and-Bottom-Bracket-Compatibility-Chart-V1-Sheet1.pdf
Have a trek madone 7.9 bb90 bottom BRACKET can i use this T47 bottom bracket if ues which one?
Thanks well explained.
Note, presenter briefly mentions "BSA" threads. There's no such thing, what you mean is BSC (British Standard Cycle). BSA was a brand a long time ago, like a hundred years ago, stood for Birmingham Small Arms. Since then many people and even companies have gotten these confused, for example I have Nervar cranks that say BSA on them referring to the pedal thread. They just mean English, as in "not French" pedals. Maybe once enough people are using it wrong, it becomes the new right? Oh well it's moot now. I'm just glad I'm old and have enough BSC shells and cranks that fit 'em that I will never have to touch one of these dumb modern "improvements" that exist only to make older standards obsolete, so you have to buy new stuff. Resist!
There is a t47 with Italian threads???
I have a 2021 Trek Domane with a T47 BB. The shell is 73mm. I have a SRAM RED eTap AXS groupset that I plan on installing on it but I just realized the crankset is a GXP which has the 24/22 step. So would I need an Internal or external BB?
24i with a gxp fit kit. if it was dub you would need a 30i with a dub fit kit. always going to be internal on a trek because of the frame
@@spencerfisher4080 In the video he states 68/73 would have outboard BB’s. Why would trek frames be any different out of curiosity?
@@gvnrchmnd Just the way the frames are designed
I need to see this in a visual
T47 is an awesome approach - let's hope all the other variations disappear. Love all my T47's!
Please define a T47 BB. How did it get the name ? Personally I will be fitting a RITCHEY Cross Crank to a RITCHEY Logic Roadie. Currently the old school internal is fitted. Kellan will know as he has a Road Logic. AVT my parts shop for a while. Good Vid otherwise. Maybe T47 means external. ?? cheers.
A T47 bottom bracket shell is threaded with a 47 x 1mm thread, and comes in a variety of lengths ranging from 68 to over 100 mm. It's confusing because it can be used with all sorts of different crank standards (including BB30, PF30, DUB, 24mm, 22/24mm stepped GXP, and a variety of other 30mm standards) ALL DEPENDING ON THE WIDTH OF THE T47 SHELL. Finally T47 just refers to the bottom bracket shell and the type of bottom bracket that it takes. But the T47 bottom brackets come in both INTERNAL AND EXTERNAL VERSIONS, as explained in the video. This is one of the reasons that it can be extremely confusing! The video tries to explain all of this in a succinct way, but that doesn't mean that it covers all of the options and it doesn't address all of the possible points of confusion. Does that help answer your question?
@@AVTBike thanks.