CyclingCeramic
T47 internal · Shimano 24 mm
Updated 2026 image · Shimano 105, Ultegra, Dura-Ace and Rotor 24 mm.
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T47 Ceramic BB
2026 T47 GUIDE · CYCLINGCERAMIC & BIKONE
T47 ceramic bottom brackets: find the right model in seconds
Start with the T47 internal 85.5–86.5 mm shell, the leading configuration in our road and gravel selection. Shimano 24 mm, SRAM DUB or Rotor 30 mm: identify the frame first, then the crank spindle. T47A 77 mm and T47 external 68 mm are different, non-interchangeable systems.
Shop and compare these T47 internal bottom brackets
CyclingCeramic
T47 internal · SRAM DUB
Ceramic version for 28.99 mm DUB spindle cranksets.
View bottom bracket
Bikone
T47 internal · DUB / QO
Bikone ceramic 85.5–86.5 mm for compatible DUB and QO spindles.
Discover BikoneSee each product page for current prices, options and availability.
Other fits :T47 internal Rotor 30 mm · All T47 ceramic models
MOST COMMON FIT Our most common fit: T47 internal 85.5–86.5 mmTrek, LOOK, Colnago, ENVE · bearings inside the frame shell
T47 internal 85.5–86.5 mm: the benchmark arrangement
In this format, the large M47 × 1 threaded shell houses both bearings inside the frame. It is the most frequent T47 configuration across the modern premium road bikes highlighted in our selection. Trek, LOOK and ENVE commonly specify 85.5 mm; several Colnago models use 86.5 mm.
Names such as “T47 internal”, “T47 IN”, “T47i” and “T47/86” refer to this inboard arrangement, provided the actual shell-width fitment is confirmed. A bike labelled simply “T47” does not specify which cups it needs.
Essential check: 85.5 or 86.5 mm refers to the width between the bare shell faces, not the overall width of the installed cups.
Examples of T47 internal frames
Trek · 85.5 mm
Madone Gen 8, recent Domane SL/SLR, T47-generation Émonda and certain Checkpoint / Checkmate models. Older Trek frames may use BB90.
LOOK · 85.5 mm
Current 795 Blade RS; 765 Optimum and 785 Huez depending on model year. Always follow the specific frameset manual.
Colnago · 86.5 mm
Recent V4Rs, V5Rs and C68 T47 frames. Older C64 and V3Rs use ThreadFit 82.5 (T45), not T47.
ENVE · 85.5 mm
Melee, Fray and MOG use inboard T47 bearings; ENVE explicitly lists the MOG’s 85.5 mm shell.
Match the crank spindle next
Shimano Hollowtech II (105, Ultegra, Dura-Ace and compatible GRX) and Rotor 24 mm need a T47 internal 24 mm unit. SRAM DUB and compatible QO DUB cranksets require a 28.99 mm version. Actual Rotor 30 mm spindles need their own T47/30 bottom bracket.
Frame source: ENVE MOG technical FAQ (85.5 mm T47 internal).
CyclingCeramic or Bikone? Both offer ceramic options. Compare cup construction, sealing, maintenance and included parts on each product page. The images shown here are actual Velo-Perso catalogue photos, including updated 2026 models.
T47A asymmetric: 77 mm shellFactor OSTRO VAM, current O2 VAM, newer Cervélo Áspero / R5-CX
T47A: asymmetric, not a standard internal T47
T47A shells are typically around 77 mm wide and are asymmetric, unlike the centred T47 internal 86 mm shell. In the common configuration, the drive-side cup places its bearing externally and the non-drive bearing sits inboard. The left and right cups have different geometries.
Examples, subject to generation
- Factor: T47A OSTRO VAM, MONZA and T47A generations of O2 VAM. Some previous O2/O2 VAM frames use BBright.
- Cervélo: newer Áspero generations and R5-CX use the brand’s asymmetric T47a interface. Some other Cervélo frames used BBright PressFit.
Manufacturer references: Factor and Cervélo Áspero.
A T47/86 does not replace a T47A. For Factor and Cervélo, never order by brand name alone.
T47 external: 68 mm shellSteel and gravel frames, including 2026 Cinelli Speciale Gravel and BAAM
T47 external 68 mm: narrow shell, outboard bearings
The bare shell is 68 mm wide with a T47 thread, and the cups position their bearings outside the frame shell. This setup is found on selected steel gravel and custom frames. It does not fit an 85.5–86.5 mm T47 internal or 77 mm T47A frame.
Verified frame examples
- 2026 Cinelli Speciale Gravel: official frameset specifications list a T47-68 mm shell.
- BAAM Reynolds steel gravel: manufacturer specifications list a 68 mm T47 threaded shell.
- Other steel / titanium frames: always consult the exact frame manual; the T47 name covers several widths.
Check your frame, spindle and fitting before orderingShimano 24 mm · Rotor 24/30 mm · SRAM DUB 28.99 mm · FAQs
Three checks, in the right order
1. The frame: exact model, generation and bare shell width. T47 threading is M47 × 1, but that alone does not tell you whether bearings are internal, external or asymmetric.
2. The spindle: Shimano 24 mm; Rotor depending on crankset at 24 or 30 mm; SRAM DUB 28.99 mm; older SRAM GXP has a stepped 24/22 mm spindle.
3. Fitting requirements: standard versus Wide/XPLR cranks, spacers, thread direction, grease, tools and recommended tightening torque. T47 is threaded and serviceable, but incorrect installation can damage the frame shell.
| Your crankset | Spindle | What to select |
|---|---|---|
| Shimano Hollowtech II / Rotor 24 | 24 mm | Correct shell format + dedicated 24 mm version. |
| SRAM DUB / compatible QO DUB | 28.99 mm | Dedicated T47 DUB with correct frame fit and spacers. |
| Rotor ALDHU / VEGAST / INpower, by spindle | 24 or 30 mm | Identify the actual spindle before choosing 24 or 30 mm. |
| Older SRAM GXP | 24 / 22 mm | Dedicated GXP; not interchangeable with Shimano. |
Why ceramic bearings?
Well-designed ceramic bearings can offer smooth rotation and low friction, but seals, lubricant, cup construction, alignment and maintenance are just as relevant. A watt saving is never automatic. A correctly specified and installed bottom bracket matters more than a premium unit that does not fit.
Frequently asked questions
Will a T47 internal 86 mm BB fit an 85.5 mm frame shell? Yes, provided the bottom bracket manufacturer expressly lists an 85.5–86.5 mm shell range and the correct spindle configuration. Several products in our range support it. Always check the exact product specifications.
Can I use a BB86 PressFit bottom bracket in a T47 frame? No. BB86 is a non-threaded PressFit system; T47 uses M47 × 1 threads. Similar shell widths do not make these standards interchangeable.
Are SRAM DUB and 30 mm spindles interchangeable? No. SRAM DUB uses a 28.99 mm spindle, not 30 mm. Choose the dedicated T47 DUB version and check the crank spacer requirements.
Do all Factor or Cervélo frames use T47A? No. Older generations may use BBright or other standards. Check the exact model, production year and frame shell dimensions.
Do ceramic bearings guarantee a multi-watt saving? No universal watt saving can be promised. Actual losses depend on bearing design, seals, lubrication, condition and installation.
