Shimano just re-released its workingman’s 105 group as a completely revamped 2 x 12-speed electronic drivetrain. Here are some quick thoughts on Shimano 105 Di2 and a rundown of pricing and weights…

Celebrating the 40th anniversary of its introduction in 1982, Shimano 105 just got a complete upgrade with a move to Di2 electronic shifting. The Shimano 105 R7100 group gets trickle-down technology from Shimano’s flagship 12-speed, wireless shifting in a more attainable package. We realize this isn’t geared toward most of our readers, with relatively high road-oriented ratios. However, it’s an interesting release that will hopefully pave the way for more 12-speed wireless offerings from Shimano. Find the pricing and a few details below.

The new Shimano 105 Di2 group has the same “wireless where it matters” wire-free cockpit and wired derailleurs attached to the seatpost’s internal battery. Here are the quick specs on each component, followed by weights and prices:

ST-R7170 Shifter
– Wireless Di2 connectivity
– 2×12-speed Dual-Control lever
– Refined hood for improved ergonomics and aerodynamics
– Improved button access

FC-R7100 Crank
– HOLLOWTECH II Crank Set
– 2×12-speed
– Chainrings: 50-34T or 52-36T

CS-R7100 Cassette
– 12-speed
– 11-tooth small cog for efficiency
– Optimized “Sweet Spot” Gears
– Compatible w/ 11-spd freehub bodies
– 11-34T

CS-HG710-12 Cassette
– 12-speed
– 11-tooth small cog for efficiency
– Compatible w/ 11-spd freehub bodies
– 11-36T, available at a later date

RD-R7150 Rear Derailleur
– SHIMANO SHADOW Rear Derailleur
– Integrated D-FLY connectivity
– 12-speed Di2 technology
– For 11-34 and 11-36T cassettes

FD-R7150 Front Derailleur
– 12-speed Di2 technology
– Fast, precise front shifting

Component
Price
Grams
Di2 Battery (BT-DN300)
$185
53
Wire (EW-SD300)
$28
7
Wire (EW-SD300)
$28
7
105 Cranksets with Chainrings (FC-R7100)
$180
765
SM-BBR60 BOTTOM BRACKET (SM-BBR60)
$32
77
105 Cassette (11-34) (CS-R7100)
$66
361
105 Di2 Front Derailleur (FD-R7150)
$153
142
105 Di2 Rear Derailleur (RD-R7150)
$280
302
12-Speed Chain (CN-M7100)
$33
252
(2) Disc Brake Rotor, 160mm (SM-RT70)
$92
285
105 Hydraulic Disc Front Brake Set
$405
407
105 Hydraulic Disc Rear Brake Set
$405
407
TOTAL
$1,887
3068

Find more information on the Shimano 105 Di2 drivetrain over at Bike.Shimano.com.

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