Le nom DUB suffit-il à choisir un boîtier ?

Non. DUB désigne l’interface du pédalier. Il faut aussi connaître le standard du cadre, la largeur de sa boîte, son diamètre intérieur si elle n’est pas filetée, et la version Road, Road Wide ou Road Ai du pédalier.

Road et Road Wide utilisent-ils toujours le même boîtier ?

Non. Selon le cadre, la référence ou les entretoises changent. Par exemple, en BSA 68 mm, SRAM indique 00.6418.015.000 pour Road et 00.6418.015.004 pour Road Wide. En T47 68 mm, la référence standard est commune, mais le montage des entretoises diffère.

BB30 et PF30 sont-ils interchangeables ?

Non. Dans cette carte route SRAM, le BB30 correspond à un diamètre intérieur de cadre de 42 mm, contre 46 mm pour le PF30. La même largeur de boîte ne suffit donc pas à garantir la compatibilité.

BB86 et BB386 : quelle différence ?

Les deux montages présentés mesurent 86,5 mm de large. Le BB86 / PressFit utilise une boîte de 41 mm de diamètre intérieur ; le BB386, une boîte de 46 mm. Choisissez avec les deux dimensions.

Puis-je choisir un boîtier VTT pour un pédalier route ?

Ne vous fiez pas uniquement au nom commercial. Certaines références SRAM sont communes à plusieurs usages, avec des entretoises différentes. La référence exacte et le montage du tableau SRAM font foi ; un boîtier DUB MTB Wide n’est pas automatiquement un boîtier Road Wide.

Un cadre BB90 Trek accepte-t-il un pédalier DUB ?

Le PDF SRAM ne propose pas d’option DUB pour la boîte BB90 de 90,5 × 37 mm. Il renvoie vers un montage GXP avec BB90 et demande de contacter Trek pour le boîtier.

Que signifient 73-A, 79-A et Road Ai ?

Ces mentions identifient des montages particuliers qui ne se résument pas à une largeur. Les 73-A et 83-A présentés sont propres à Cannondale ; le 79-A correspond au Cervélo BBRight. Road Ai demande un pédalier et un montage adaptés.

Probikeshop advice · SRAM

DUB · Road & gravel

Road and Gravel: which SRAM DUB bottom bracket should you choose?

For your road or gravel bike, identify your frame’s bottom bracket standard and SRAM DUB crankset version, then find the compatible bottom bracket.

1. Three details to check

The chainset type

Check for DUB, then Road, Road Wide or Road Ai in the chainset part number. This guide does not cover mountain bike setups or other SRAM axles.

The frame standard

Threaded: BSA / BSC, Italian or T47. Unthreaded: BB30, PF30, BB86 or BB386. Start with the frame manufacturer’s specification.

Bottom bracket shell dimensions

Note its width and, for an unthreaded frame, its internal diameter. Measure the bare frame, without including the cups or spacers.

SRAM illustration of the frame’s bottom bracket shell, without the cups — **The bottom bracket shell is part of the frame.**The bottom bracket and its bearings fit into it.Illustration from the SRAM document.

Example of a SRAM DUB BSA bottom bracket with threaded cups

Screw-in

BSA / BSC

English threading. For road bikes: a 68 mm shell, or 73 mm with the specified Road Wide setup.

Example of a SRAM DUB T47 bottom bracket for an 85.5 mm shell

Screw-in

T47

A different thread standard. The version depends on the frame’s bottom bracket shell width: 68, 77-A or 85.5 mm.

Unthreaded

PressFit / BB30

Check both dimensions. Diameters of 41, 42 and 46 mm correspond to different setups.

Your configuration

2. Find your part number

Select the exact chainset and frame specifications. The result follows SRAM’s compatibility chart.

Your DUB chainset

The frame’s bottom bracket shell

Standard and dimensions

Complete all three fields to see the matching bottom bracket and spacers.

Spacers: fitting guidelines

Left = non-drive side. Right = drive side. The values below refer to external spacers; the PDF does not specify an internal spacer for these setups. Always follow the SRAM instructions and frame specification.

Frame and chainset	External left	External right
BSA / BSC · 68 mm · Road	None	3 mm
BSA / BSC · 68 mm · Road Wide	2.5 mm	5.5 mm
BSA / BSC · 73 mm · Road Wide	None	3 mm
Italian · 70 mm · Road	None	2 mm
Italian · 70 mm · Road Wide	2.5 mm	4.5 mm
T47 · 68 mm · Road	None	3 mm
T47 · 68 mm · Road Wide	2.5 mm	5.5 mm
T47 · 77-A mm · Road	None	3 mm
T47 · 77-A mm · Road Wide	2.5 mm	5.5 mm
T47 · 85.5 mm · Road	None	3 mm
T47 · 85.5 mm · Road Wide	2.5 mm	5.5 mm
BB30 · 68 × 42 mm · Road	None	3 mm
BB30 · 68 × 42 mm · Road Wide	2.5 mm	5.5 mm
BB30 · 73 × 42 mm · Road Wide	None	3 mm
BB30 · 73-A × 42 mm · Road	None	3 mm
BB30 · 73-A × 42 mm · Road Wide	2.5 mm	5.5 mm
PF30 · 68 × 46 mm · Road	None	3 mm
PF30 · 68 × 46 mm · Road Wide	2.5 mm	5.5 mm
PF30 · 73 × 46 mm · Road Wide	None	3 mm
PF30 · 73-A × 46 mm · Road	None	3 mm
PF30 · 73-A × 46 mm · Road Wide	2.5 mm	5.5 mm
BBRight / PF30 · 79-A × 46 mm · Road	None	3 mm
BBRight / PF30 · 79-A × 46 mm · Road Wide	2.5 mm	5.5 mm
BB30 · 83-A × 42 mm · Road Ai	None	4.5 mm
PF30 · 83-A × 46 mm · Road Ai	6 mm	9 mm
PressFit / BB86 · 86.5 × 41 mm · Road	None	3 mm
PressFit / BB86 · 86.5 × 41 mm · Road Wide	2.5 mm	5.5 mm
BB386 · 86.5 × 46 mm · Road	None	2 mm
BB386 · 86.5 × 46 mm · Road Wide	2.5 mm	4.5 mm

Frequently asked questions

Is DUB alone enough to choose a bottom bracket?

No. DUB refers to the chainset interface. You also need to know the frame standard, its bottom bracket shell width, its internal diameter if it is unthreaded, and whether the chainset is Road, Road Wide or Road Ai.

Do Road and Road Wide always use the same bottom bracket?

No. Depending on the frame, the part number or spacers change. For example, for BSA 68 mm, SRAM specifies 00.6418.015.000 for Road and 00.6418.015.004 for Road Wide. For T47 68 mm, the standard part number is the same, but the spacer arrangement differs.

Are BB30 and PF30 interchangeable?

No. In this SRAM road chart, BB30 has a frame shell internal diameter of 42 mm, compared with 46 mm for PF30. The same shell width is therefore not enough to guarantee compatibility.

BB86 and BB386: what is the difference?

Both setups shown are 86.5 mm wide. BB86 / PressFit uses a shell with a 41 mm internal diameter; BB386 uses a 46 mm shell. Use both dimensions when choosing.

Can I choose a mountain bike bottom bracket for a road chainset?

Do not rely on the product name alone. Some SRAM part numbers are used for several applications, with different spacers. The exact part number and setup in the SRAM chart are what matter; a DUB MTB Wide bottom bracket is not automatically a Road Wide bottom bracket.

Can a Trek BB90 frame take a DUB chainset?

The SRAM PDF does not offer a DUB option for a 90.5 × 37 mm BB90 shell. It points to a GXP setup with BB90 and advises contacting Trek about the bottom bracket.

What do 73-A, 79-A and Road Ai mean?

These designations identify specific setups that cannot be defined by width alone. The 73-A and 83-A versions shown are specific to Cannondale; 79-A corresponds to Cervélo BBRight. Road Ai requires a suitable chainset and setup.

All part numbers, frame by frame

The links open Probikeshop product pages matching the manufacturer’s part number. “Standard” and “Ceramic” refer to the bearing options in the SRAM document. Prices and availability are shown on the product pages.

Threaded shells
Your frame	DUB Road	DUB Road Wide	To check
BSA / BSC · 68 mm	Standard`00.6418.015.000`Ceramic`00.6418.015.008`	Standard`00.6418.015.004`Ceramic`00.6418.015.009`	English threading, symmetric shell.
BSA / BSC · 73 mm	Not specified by SRAM	Standard`00.6418.015.000`Ceramic`00.6418.015.008`	Road Wide only in this chart.
Italian · 70 mm	Standard`00.6418.038.000`Ceramic`00.6418.038.001`	Standard`00.6418.038.000`Ceramic`00.6418.038.001`	Italian threading, different from BSA.
T47 · 68 mm	Standard`00.6418.033.002`Ceramic`00.6418.033.006`	Standard`00.6418.033.002`Ceramic`00.6418.033.006`	T47 version for a 68 mm shell.
T47 · 77-A mm	Standard`00.6418.033.003`Ceramic`00.6418.033.007`	Standard`00.6418.033.003`Ceramic`00.6418.033.007`	Asymmetric shell: confirm the frame specification.
T47 · 85.5 mm	Standard`00.6418.033.000`Ceramic`00.6418.033.004`	Standard`00.6418.033.001`Ceramic`00.6418.033.005`	Do not confuse it with an 86.5 mm PressFit shell.

Unthreaded shells
Your frame	DUB Road	DUB Road Wide	To check
BB30 · 68 × 42 mm	Standard`00.6418.017.000`Ceramic`00.6418.017.005`	Standard`00.6418.017.003`Ceramic`00.6418.017.007`	Frame shell width × internal diameter.
BB30 · 73 × 42 mm	Not specified by SRAM	Standard`00.6418.017.000`Ceramic`00.6418.017.005`	Symmetric shell; not to be confused with 73-A.
BB30 · 73-A × 42 mm	Standard`00.6418.027.000`Ceramic`00.6418.017.008`	Standard`00.6418.017.002`Ceramic`00.6418.017.006`	Cannondale asymmetric setup only.
PF30 · 68 × 46 mm	Standard`00.6418.018.000`Ceramic`00.6418.018.007`	Standard`00.6418.018.001`Ceramic`00.6418.018.008`	Frame shell width × internal diameter.
PF30 · 73 × 46 mm	Not specified by SRAM	Standard`00.6418.018.000`Ceramic`00.6418.018.007`	Symmetric shell; not to be confused with 73-A.
PF30 · 73-A × 46 mm	Standard`00.6418.028.001`	Standard`00.6418.018.004`Ceramic`00.6418.018.009`	Cannondale asymmetric setup only.
BBRight / PF30 · 79-A × 46 mm	Standard`00.6418.028.000`	Standard`00.6418.018.003`	Cervélo BBRight only.
PressFit / BB86 · 86.5 × 41 mm	Standard`00.6418.025.000`	Standard`00.6418.016.004`Ceramic`00.6418.016.007`	Its 41 mm diameter distinguishes it from BB386.
BB386 · 86.5 × 46 mm	Standard`00.6418.026.000`Ceramic`00.6418.018.011`	Standard`00.6418.018.005`Ceramic`00.6418.018.010`	Its 46 mm diameter distinguishes it from BB86.

Cases to identify separately

Cannondale Road Ai

BB30 83-A × 42 mm: Standard00.6418.027.001

PF30 83-A × 46 mm: Standard00.6418.028.002

Trek BB90

90.5 × 37 mm: no DUB option in the SRAM PDF. For bottom bracket selection, the document points to GXP / BB90 and Trek.

A “Not specified by SRAM” entry means the document does not list that combination. Do not substitute a symmetric shell for an asymmetric one based on width alone.

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