Shimano Di2 Front Wiring Kit SM-EW79A-I for Tri / TT Shifters Compatibility

Shimano Di2 Front Wiring Kit SM-EW79A-I

The front wire kit comes with the system indicator and is needed to operate your respective system.

This wire set is to be connected with Shimano ST-7971 and SW-7971.
It is not connecting with the SC-7900 Flight Deck. (in that case you need the SM-EW-79F-I).

Japan Retail price 11.574 yen (see cross rate here)

Shimano Di2 Front Wiring Kit SM-EW79A-E for Road STI controls

Shimano Di2 Front Wiring Kit SM-EW79A-E

The front wire kit comes with the system indicator and is needed to operate your respective system.

This wire set is to be connected with Shimano ST-7970.
It is not connecting with the SC-7900 Flight Deck. (in that case you need the SM-EW79F-E).

Japan Retail price 10.862 yen (see cross rate here)

Shimano SM-BCR1 Dura-Ace 7970 Di2 Battery Charger

Shimano SM-BCR1 charger.

Shimano Charger for recharging DI2 Battery.

The battery is rechargeable and comes with a mount that easily adapts to most bikes. Lithium Ion technology is lighter, more compact and better performing than other power sources, making it a clear choice for Di2.

100/240V power
110g
100ｍｍｘ30ｍｍｘ72ｍｍ
Lithium Charger

Japan Retail price 7.352 yen (see cross rate here)

To charge with Shimano SM-BTR1

Shimano SM-BTR1 Dura-Ace Di2 Battery Pack

Shimano SM-BTR1

The 7.4V, high performance Lithium Ion battery is designed to deliver reliable, long life even in the worst conditions. In conditions requiring consistent and frequent shifting, the battery is capable of 1000 kilometers of use. (BE careful, This is NOT Miles!)

The battery is rechargeable and comes with a mount that easily adapts to most bikes. Lithium Ion technology is lighter, more compact and better performing than other power sources, making it a clear choice for Di2.

Lithium Battery
530mAh.
71g
7.4Volts

Japan Retail price 7.826 yen (see cross rate here)

Require to be charged with Shimano SM-BCR1

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 RD-7970 Dura-Ace Di2 Rear Derailleur Compatibility and Specifications

Shimano Dura-Ace Di2 RD-7970 Rear Derailleur 10 speed

Like the 7900 mechanical derailleur, the 7970 has a new carbon fiber rear pulley cage and the new design is compatible with wider range cog sets, accommodating up to a 27 tooth cog. The differences are the fact that the unit is now driven by a servo motor instead of a cable and spring, so shifts are identical and precise every time as the computer control unit analyzes each shift.

The derailleur has a built in mechanism that will allow the body to move inward under impact to reduce the potential for damage in the case of a crash. Cycling through the shifting a couple of times allows the shifter and rear derailleur to automatically re-synchronize.

Di2 - Digital Integrated Intelligence - electronic shifting
Titanium B axle
Carbon fiber pulley cage
Programmed motion
Published weight 225 grams
10 speed compatible
Double Compatible

Japan Retail price 64.227 yen (see cross rate here)

Note: DOES NOT works with 11-28 cassette.

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

Compatible with Shimano 10 speed cassettes: CS-7900 (not 11/28), CS-7800, CS-6700, CS-6600, CS-5700, CS-5600. (does Not work with 11/28)

Compatible with Shimano Chains: CN-7900, CN-7901, CN-6700, CN-6600, CN-5700, CN-5600.

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.

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.
Graham Watson's Tour de France Travel Guide: The Complete Insider's Guide to the Tour!
Cycling in France
Cycling in Italy
Training and Racing with a Power Meter
Racing Weight: How to Get Lean for Peak Performance
The Time-Crunched Cyclist: Fit, Fast, and Powerful in 6 Hours a Week
The Cyclist's Training Bible

Shimano Dura Ace WH-7900-C24-TL Carbon Tubuless Wheelset compatibility and specifications

Shimano Dura Ace WH-7900-C24-TL Carbon Tubeless 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-TL
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: Tubeless
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: (606g front / 789g rear) 1.395g 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 94.785 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.
Graham Watson's Tour de France Travel Guide: The Complete Insider's Guide to the Tour!
Cycling in France
Cycling in Italy
Training and Racing with a Power Meter
Racing Weight: How to Get Lean for Peak Performance
The Time-Crunched Cyclist: Fit, Fast, and Powerful in 6 Hours a Week
The Cyclist's Training Bible

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.