Shimano Di2 Dura-Ace SW-7971 Bar-End Shifters Compatibility and Specifictions

Shimano Di2 Dura-Ace SW-7971 TT / Tri bar end shifters.

Electronic Shimano Di2 bar-end shifters. Evolution never stops. The age of electronically controllable shifting is upon us. The new Dura-Ace with Di2 technology brings shifting to a new level. Precise shifting every time and very fast in every situation - front and rear.

Note - To complete the Di2 System all items listed below are required. To maximize the performance and utilize Di2 to its fullest potential it is very highly recommended all other components be Shimano Dura-Ace 7900 series.

Published weight 103 grams (pair)
10 speed compatible
Double and Compact Compatible

Japan Retail price 29.127 yen (see cross rate here)

Compatible ONLY with Shimano following parts: RD-7970 and FD-7970.

Require to be used with Shimano; SM-BTR1, EW-7970, SM-EW-79F-I (with SC-7900) or SM-EW79A-I.

Shimano DI2 ST-7971 Tri/TT Shifters Compatibility and Specifications

Shimano DI2 ST-7971 Tri/TT Shifters

Di2 - Digital Integrated Intelligence - electronic shifting

Published weight 116 grams (pair)
10 speed compatible
Double and Compact Compatible

Japan Retail price 39.421 yen (see cross rate here)

Compatible ONLY with Shimano following parts: RD-7970 and FD-7970

Compatible with Brake Calipers: BR-7900, BR-7800, BR-6700, BR-6600-S/-G, BR-5700, BR-5600.

Require to be used with Shimano; SM-BTR1, EW-7970, SM-EW-79F-I (with SC-7900) or SM-EW79A-I.

Shimano FD-7970 Dura-Ace Di2 Front Derailleur Compatibility and Specifications

Shimano Dura-Ace FD-7970 Di2 Front Derailleur

The front derailleur is the “brains” of the system. The integrated ultra-compact CPU not only ensures that shifting is perfect for both the front and rear derailleurs individually, but also by monitoring the position of each, creates a front derailleur that tracks the chain and requires zero manual trim without sacrificing any shifting speed. The front derailleur logic also performs the inward shift from the big chainring in two parts to eliminate chain drop, with both actions measured in fractions of a second.

Di2 - Digital Integrated Intelligence - electronic shifting
Titanium B axle
Carbon fiber pulley cage
Programmed motion
Maximum outer: 50-56T
Chainline: 43.5mm
Published weight 124 grams
10 speed compatible
Double and Compact Compatible

Japan Retail price 47.626 yen (see cross rate here)

Compatible ONLY with Shimano following parts: ST-7970, ST-7971, RD-7970.

Compatible with Shimano crankset: FC-7900, FC-7950, FC-7800C and also * with FC-7800, FC-6600, FC-6601-G, FC-6650-S/-G, FC-5600-S/-L, FC-5650-S/-L, FC-R700, FC-R600. (*Slower shifting may occur depending of frame size)

Shimano Cassettes: CS-7900 (not 11/28), CS-7800, CS-6700 (not 11-28), CS-6600, CS-5700 (not 11-28), CS-5600.
Compatible with Shimano chains: CN-7900 and CN-7901, CN-7801, CN-6600, CN-6700, CN-5600, CN-5700.

Require to be used with Shimano; SM-BTR1, EW-7970, Double setting SM-EW79F-E (with SC-7900) or SM-EW79A-E or Time Trial setting SM-EW-79F-I (with SC-7900) or SM-EW79A-I.

Mouting Clamps available in SM-AD79L(34.9mm) and SM-AD79M(31.8mm）or SM-AD79S(28.6mm）

Shimano Dura Ace WH-7900-C24-CL Carbon Clincher Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C24-CL Carbon Clincher Wheelset 24mm deep.

High speed cruising with astonishing acceleration. improved acceleration performance within aero dynamics.
Proprietary In -house Carbon rim construction -Ultra-light Carbon laminated rim
Easy bearing adjust system
Increased axial Rigidity with over size A7075 Alloy axle
Double butted blade Alloy axle for ligther weight and aerodynamics

Model Number:WH-7900-C24-CL
Series: Dura Ace
Brake Type: RIM
Titanium Free hub body
Cassette Compatibility: 8/ 9 / 10 (can be used with an additional spacer for 10 speed)
Over Locknut: F:100mm / R:130mm
Axle Type: QR
QR Skewer Length: F:108mm/ R:141mm
Axle Length: F:100mm/ R:130mm
Axle Material: Aluminum
Hub Shell Material: Aluminum
Hub Shell Finish: Buffed/ Anodized
QR Lever Material: Aluminum
QR Lever Finish: Anodized
Rim Type: Clincher
Rim Size: 622x15C (700C)
Rim Material: Carbon Fiber/Aluminium
Rim Finish: Anodized
Rim Height: F:24mm / R:23mm
Rim Width: 20.8mm
Straight pull spokes for longer spoke life (front: 16, rear: 20)
Spoke Gauge/Shape: Front: 2.0-1.5-2.0/ Straight pull, Bladed / Rear:RH:2.0-1.8-2.0 / Straight pull, Bladed LH:2.0-1.5-2.0/ Straight pull, Bladed
Spoke Material: Stainless Steel
Spoke Color: black
Average Weight: (646g front / 818g rear) 1.264g pair
Require to use Cassette spacer if mounting 10 speed cassettes 7900 / 6700 / 5700 (Not needed if mounting CS-6600 series)
Require Shimano Tool TL-LR15 for locking the cassette lockring. Will need also the Shimano Tool TL-SR21 to unlock the lockring.

Japan Retail price 92.100 yen (see cross rate here)

Compatible with All Shimano HG 8, 9 and 10 speed cassettes.
Compatible with Shimano cassettes: CS-7900, CS-6700, CS-5700, CS-M980, CS-M771-10, CS-HG81-10

Also works with 10 speed SRAM cassettes; OG 1090, PG 1070, PG 1050, XG-1099

This is for road racing usage.
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Shimano Dura Ace WH-7900-C35-CL Carbon Clincher Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C35-CL Carbon Clincher Wheelset 35mm deep.

High speed cruising with astonishing acceleration. improved acceleration performance within aero dynamics.

Proprietary In -house Carbon rim construction -High modulus Carbon rim
Easy bearing adjust system
Increased axial Rigidity with over size A7075 Alloy axle
Double butted blade Alloy axle for ligther weight and aerodynamics

Model Number:WH-7900-C35-CL
Series: Dura Ace
Brake Type: RIM
Titanium Free hub body
Cassette Compatibility: 8/ 9 / 10 (can be used with an additional spacer for 10 speed)
Over Locknut: F:100mm / R:130mm
Axle Type: QR
QR Skewer Length: F:108mm/ R:141mm
Axle Length: F:100mm/ R:130mm
Axle Material: Aluminum
Hub Shell Material: Aluminum
Hub Shell Finish: Buffed/ Anodized
QR Lever Material: Aluminum
QR Lever Finish: Anodized
Rim Type: Clincher
Rim Size: 622x15C (700C)
Rim Material: Carbon/Aluminium
Rim Finish: Anodized
Rim Height: F:35mm / R:35mm
Rim Width: 20.8mm
Straight pull spokes for longer spoke life (front :16, rear: 20)
Spoke Gauge/Shape: Front: 2.0-1.8-2.0/ Straight pull, Bladed / Rear:RH:2.0-1.8-2.0 / Straight pull, Bladed LH:2.0-1.5-2.0/ Straight pull, Bladed
Spoke Material: Stainless Steel
Spoke Color: black
Average Weight: (737g front / 890g rear) 1627g pair
Require to use Cassette spacer if mounting 10 speed cassettes 7900 / 6700 / 5700 (Not needed if mounting CS-6600 series)
Require Shimano Tool TL-LR15 for locking the cassette lockring. Will need also the Shimano Tool TL-SR21 to unlock the lockring.

Japan Retail price 150.959 yen (see cross rate here)

Compatible with All Shimano HG 8, 9 and 10 speed cassettes.
Compatible with Shimano cassettes: CS-7900, CS-6700, CS-5700, CS-M980, CS-M771-10, CS-HG81-10

Also works with 10 speed SRAM cassettes; OG 1090, PG 1070, PG 1050, XG-1099

This is for road racing usage.

Shimano Dura Ace WH-7900-C35-TU Carbon Tubuluar Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C35-TU Carbon Tubular Wheelset 35mm deep.

High speed cruising with astonishing acceleration. improved acceleration performance within aero dynamics.

Proprietary In -house Carbon rim construction -High modulus Carbon rim
Easy bearing adjust system
Increased axial Rigidity with over size A7075 Alloy axle
Double butted blade Alloy axle for ligther weight and aerodynamics

Model Number:WH-7900-C35-TU
Series: Dura Ace
Brake Type: RIM
Titanium Free hub body
Cassette Compatibility: 8/ 9 / 10 (can be used with an additional spacer for 10 speed)
Over Locknut: F:100mm / R:130mm
Axle Type: QR
QR Skewer Length: F:108mm/ R:141mm
Axle Length: F:100mm/ R:130mm
Axle Material: Aluminum
Hub Shell Material: Aluminum
Hub Shell Finish: Buffed/ Anodized
QR Lever Material: Aluminum
QR Lever Finish: Anodized
Rim Type: Tubular
Rim Size: 622x15C (700C)
Rim Material: Carbon
Rim Finish: Anodized
Rim Height: F:35mm / R:35mm
Rim Width: 20.8mm
Straight pull spokes for longer spoke life (front :16, rear: 20)
Spoke Gauge/Shape: Front: 2.0-1.8-2.0/ Straight pull, Bladed / Rear:RH:2.0-1.8-2.0 / Straight pull, Bladed LH:2.0-1.5-2.0/ Straight pull, Bladed
Spoke Material: Stainless Steel
Spoke Color: black
Average Weight: (602g front / 737g rear) 1.339g pair
Require to use Cassette spacer if mounting 10 speed cassettes 7900 / 6700 / 5700 (Not needed if mounting CS-6600 series)
Require Shimano Tool TL-LR15 for locking the cassette lockring. Will need also the Shimano Tool TL-SR21 to unlock the lockring.

Japan Retail price 211.461 yen (see cross rate here)

Compatible with All Shimano HG 8, 9 and 10 speed cassettes.
Compatible with Shimano cassettes: CS-7900, CS-6700, CS-5700, CS-M980, CS-M771-10, CS-HG81-10

Also works with 10 speed SRAM cassettes; OG 1090, PG 1070, PG 1050, XG-1099

This is for road racing usage.

Shimano Dura Ace WH-7900-C50-CL Carbon Clincher Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C50-CL Carbon Clincher Wheelset 50mm deep.

High speed cruising with astonishing acceleration. improved acceleration performance within aero dynamics.

Proprietary In -house Carbon rim construction -High modulus Carbon rim
Easy bearing adjust system
Increased axial Rigidity with over size A7075 Alloy axle
Double butted blade Alloy axle for ligther weight and aerodynamics

Model Number:WH-7900-C50-CL
Series: Dura Ace
Brake Type: RIM
Titanium Free hub body
Cassette Compatibility: 8/ 9 / 10 (can be used with an additional spacer for 10 speed)
Over Locknut: F:100mm / R:130mm
Axle Type: QR
QR Skewer Length: F:108mm/ R:141mm
Axle Length: F:100mm/ R:130mm
Axle Material: Aluminum
Hub Shell Material: Aluminum
Hub Shell Finish: Buffed/ Anodized
QR Lever Material: Aluminum
QR Lever Finish: Anodized
Rim Type: Tubular
Rim Size: 622x15C (700C)
Rim Material: Carbon/Aluminium
Rim Finish: Anodized
Rim Height: F:50mm / R:50mm
Rim Width: 20.8mm
Straight pull spokes for longer spoke life (front :16, rear: 20)
Spoke Gauge/Shape: Front: 2.0-1.8-2.0/ Straight pull, Bladed / Rear:RH:2.0-1.8-2.0 / Straight pull, Bladed LH:2.0-1.5-2.0/ Straight pull, Bladed
Spoke Material: Stainless Steel
Spoke Color: black
Average Weight: (747g front / 915g rear) 1.662g pair
Require to use Cassette spacer if mounting 10 speed cassettes 7900 / 6700 / 5700 (Not needed if mounting CS-6600 series)
Require Shimano Tool TL-LR15 for locking the cassette lockring. Will need also the Shimano Tool TL-SR21 to unlock the lockring.

Japan Retail price (Spring 2011) yen (see cross rate here)

Compatible with All Shimano HG 8, 9 and 10 speed cassettes.
Compatible with Shimano cassettes: CS-7900, CS-6700, CS-5700, CS-M980, CS-M771-10, CS-HG81-10

Also works with 10 speed SRAM cassettes; OG 1090, PG 1070, PG 1050, XG-1099

This is for road racing usage.

Shimano Dura Ace WH-7900-C50-TU Carbon Tubular Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C50-TU Carbon Tubular Wheelset 50mm deep.

Proprietary In -house Carbon rim construction -High modulus Carbon rim
Easy bearing adjust system
Increased axial Rigidity with over size A7075 Alloy axle
Double butted blade Alloy axle for ligther weight and aerodynamics

Model Number:WH-7900-C50-TU
Series: Dura Ace
Brake Type: RIM
Titanium Free hub body
Cassette Compatibility: 8/ 9 / 10 (can be used with an additional spacer for 10 speed)
Over Locknut: F:100mm / R:130mm
Axle Type: QR
QR Skewer Length: F:108mm/ R:141mm
Axle Length: F:100mm/ R:130mm
Axle Material: Aluminum
Hub Shell Material: Aluminum
Hub Shell Finish: Buffed/ Anodized
QR Lever Material: Aluminum
QR Lever Finish: Anodized
Rim Type: Tubular
Rim Size: 622x15C (700C)
Rim Material: Carbon
Rim Finish: Anodized
Rim Height: F:50mm / R:50mm
Rim Width: 20.8mm
Straight pull spokes for longer spoke life (front :16, rear: 20)
Spoke Gauge/Shape: Front: 2.0-1.8-2.0/ Straight pull, Bladed / Rear:RH:2.0-1.8-2.0 / Straight pull, Bladed LH:2.0-1.5-2.0/ Straight pull, Bladed
Spoke Material: Stainless Steel
Spoke Color: black
Average Weight: (612g front / 784g rear) 1.396g pair
Require to use Cassette spacer if mounting 10 speed cassettes 7900 / 6700 / 5700 (Not needed if mounting CS-6600 series)
Require Shimano Tool TL-LR15 for locking the cassette lockring. Will need also the Shimano Tool TL-SR21 to unlock the lockring.

Japan Retail price yen (see cross rate here)

Compatible with All Shimano HG 8, 9 and 10 speed cassettes.
Compatible with Shimano cassettes: CS-7900, CS-6700, CS-5700, CS-M980, CS-M771-10, CS-HG81-10

Also works with 10 speed SRAM cassettes; OG 1090, PG 1070, PG 1050, XG-1099

This is for road racing usage.

Shimano Dura Ace Road Pedals PD-7900 SPD-SL Compatibility and specifications

Shimano Dura Ace Road Pedals PD-7900

The NEW Shimano Dura Ace PD-7900 Carbon pedals retains the features of its predecessors, has a stainless steel pressure plate to ensure longevity.

Carbon composite SPD-SL pedal
Stainless steel pressure plate
SPD-SL features and benefits
Shimano Cleats SM-SH11 (floating) cleats included
Shimano cleats SM-SH10 (fixed) cleats as option

Model Number: PD-7900
Series Dura Ace
Pedal System SPD-SL
Cleat Retention Indicator
Cleat Retention Adjuster
Pedal Body Material: Aluminum / panted
Average Weight: 248g (this is 30g lighter than PD-7810)
Pedals + Cleats weight 248g + 70g = 318g
Threading pitch is BSC 9/16 (this is the worldwide standard of pedals threading, unless you mount them on an 40 years old bike you don't have much to worry)

Japan Retail price 23.007 (pair) yen (see cross rate here)

Compatible with Shimano shoes that use SPD-SL cleats.

This is for road bike usage will also works for cyclo-cross / randonneur / touring, etc...

Shimano Dura Ace Bar End Shifter SL-BS79 2/3x10 speed compatibility and specifications

Shimano Dura Ace STI Dual Control Shifters SL-BS79

The legend of Dura-Ace once again sets the industry standard. Created by definitive Shimano engineering and the latest technology, the new 7900 series Dura-Ace mechanical road group provides the ideal synergy of lightweight, durability and overall performance.

When reliability & seconds count, Shimano's lightweight bar-end shifters will help keep you aerodynamic and in-gear.

Note: it does NOT allow friction mode for the rear derailleur

SIS Shifting | Indexed shifts
10-speed compatible
Legendary design
Model Number SL-BS79
Series DURA-ACE
Shift Lever Type: bar end
Cassette Compatibility: 10-speed
Front Shifting: double/triple
Material: aluminum/clear coated
Shift Cable Casing: SIS-SP41
Will fit handlebar inner diameter 19 to 22mm
Average Weight: 178g (pair)

Japan Retail Price 9.582 yen (please check here for cross rate)

Compatible with Front derailleur: FD-7900, FD-6700, FD-6703, FD-6600, FD-6600G, FD-6603, FD-5700, FD-5703, FD-5600, FD-5603, FD-5600L.

Compatible with Rear derailleur: RD-6700, RD-5700, RD-7900, RD-7800, RD-6600, RD-6600G, RD-5600, RD-5600L.

Shimano Dura-Ace Bottom-Bracket SM-BB7900 HollowTech II Compatibility and Specs

Shimano Dura-Ace SM-BB7900 HollowTech II Bottowm Bracket

SM-BB7900 is available in 2 threading type; English type (BSC) 68mm and Italian type (ITA) 70mm type.
95% of bicycle frames are built with 68mm BB shell, if your bike was handbuilt in Italy there is a bigger chance that it features an Italian threading. You must check with frame builder.

The Dura-Ace Hollowtech II bottom bracket offers a wider bearing space for superior stability and an improved seal design for longer durability.

Wide bearing spacing
Superior stability
Improved seal design
Smooth rotation and long-term durability
Weight: 90g
BB threading: JIS(68) or ITALIAN (70)mm
Chain line: 43.5mm (double)

You'll need Shimano BB tool TL-FC36 Bottom Bracket Unit Installation Tool for installation or removal.

Japan Retail price 2.634 yen (see cross rate here)

Compatible with Shimano 10 speed crankset: FC-5700, FC-5750, FC-5703, FC-6750, FC-6700, FC-6703, FC-7900, FC-7950 and also FC-7800, FC-6600, FC-6601G, FC-6650G, FC-5600, FC-5600L, FC-5650, FC-5650L, FC-R600, FC-R550, FC-7803, FC-6603, FC-6604G, FC-5603, FC-5603-L, FC-R553, FC-4500, FC-4550, FC-4550-S, FC-3450, FC-4503, FC-3403.

This is for road bike usage will also works for cyclo-cross / randonneur / touring, etc...

Shimano Dura-Ace Cassette Sprockets CS-7900 10 speed Compatibility and Specs

Shimano Dura-Ace CS-7900 Cassette Sprockets 10 speed

A super lightweight and rigid aluminum cassette sprocket carrier. The largest four cogs are titanium and weight is reduced by 10 grams.

Revised gear sprocket design
Precise & reliable shifting
8 cassette combinations
To accommodate more cyclists
Rigid aluminum carrier
Lightweight & rigid
Four titanium sprockets
Lightweight
Weight: 163.2g (11-23T)
NOTE: CS-7900 11-27 and 11-28 require the use of RD-7900 or RD-6700 or RD-5700

Note 2: RD-7970 is NOT compatible with 11-28 cassettes (CS-7900, CS-6700, CS-5700)
Model Number: CS-7900
Series: DURA-ACE
Alloy Sprocket Carrier: yes
Number of Sprockets: 10-speed
Sprocket Material: steel/titanium
Sprocket Finish: nickel plated & titanium
Chain Compatibility: Super Narrow HG for 10-speed
Average Weight: 163g (11-23)
Cassette Options: 8
Option 1 11-21T
Sprocket Sizes: 11-12-13-14-15-16-17-18-19-21
Titanium Sprockets 17-18-19-21
Option 2 11-23T
Sprocket Sizes 11-12-13-14-15-16-17-19-21-23
Titanium Sprockets 17-19-21-23
Option 3 11-25T
Sprocket Sizes 11-12-13-14-15-17-19-21-23-25
Titanium Sprockets 19-21-23-25
Option 4 11-27T
Sprocket Sizes 11-12-13-14-15-17-19-21-24-27
Titanium Sprockets 19-21-24-27
Option 5 11-28T
Sprocket Sizes 11-12-13-14-15-17-19-21-24-28
Titanium Sprockets 19-21-24-28
Option 6 12-23T
Sprocket Sizes 12-13-14-15-16-17-18-19-21-23
Titanium Sprockets 18-19-21-23
Option 7 12-25T
Sprocket Sizes 12-13-14-15-16-17-19-21-23-25
Titanium Sprockets 19-21-23-25
Option 8 12-27T
Sprocket Sizes 12-13-14-15-16-17-19-21-24-27
Titanium Sprockets 19-21-24-27
Sold with Lock ring.

Japan Retail price 21.558 yen (see cross rate here)

Compatible with RD-7970, RD-7900-SS, RD-7900-GS, RD-6700-SS, RD-6700-GS, RD-5700-SS, RD-5700-GS.

Compatible with Shimano 10 speed chains: CN-7901, CN-7900, CN-6700, CN-6701, CN-5701 and also CN-5600, CN-6600, CN-7801 (these last 3 chains don't work with CS-6700 11-28 and CS-7900 11-27 and 11-28)

Compatible with Shimano hubs: FH-7900, FH-7850, FH-6700, FH-6600, FH-5700, FH-5600, FH-4500, FH-3300, FH-3300, FH-2200, FH-R505.

Compatible with Shimano wheels: WH-7900, WH-6700, WH-5700

This is for road bike usage will also works for cyclo-cross / randonneur / touring, etc...

Required Tool:
Mounting: Shimano Tool TL-LR15
Removal: Shimano Tool TL-LR15 and Shimano Tool TL-SR21

Shimano Dura Ace Chain CN-7901 Compatibility and Specs

Shimano Dura Ace Chain CN-7901.
Be careful, CN-7901 and CN-7900 are different chains and don't work on same parts, please check compatibility links at the end of this article.

The new asymmetric design of the Dura-Ace Redesigned plates that improve the contact interface with the cogs. Other improvements to the links provide greater durability and life with less noise and smoother function. Use of hollow pins drops weight by over 18 grams even with the addition of a quick connection / removal link.

Redesigned outer plate | Reduces chain suck
Redesigned asymmetric outer and inner plates | Better contact with gear teeth and smoother shifting, high efficiency pedaling
Hollow pin and perforated plates
Lightweight & strong.
Note: In order to obtain god gear shifting performance, the CN-7901 has a forward side and a reverse side, and the sides are marked so that the CN-7901 will face the correct way when installed.

Model Number: CN-7901
Series: DURA-ACE
Chain Type: Super Narrow HG for 10-speed
Cassette Compatibility: 10-speed
Pin Link Plate Hollow Link Pin
Roller Link Plate: plated
Average Weight 252g

Use Shimano Chain wear indicator tool, TL-CN41 tool and Shimano TL-CN27.
This chain uses pins Y08X98011 (pins have 2 grooves)

Japan Retail price (116 Links) 4.405 yen (see cross rate here)

7900 series parts are compatible with 10 speed parts Only.

Compatible with Shimano Cassette: CS-7900, CS-7800, CS-6700, CS-6600, CS-5700, CS-5600.

Compatible ONLY with the following Shimano 10 speed crankset: FC-5700, FC-5750, FC-6750, FC-6700, FC-7900, FC-7950, also works with FC-7800C (Does not work with FC-7800).

Does NOT works with FC-6703 and FC-5703.

This is for road bike usage will also works for cyclo-cross / randonneur / touring, etc...