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Arms-on with the brand new Shimano 105 Di2 R7100 groupset – unboxing and precise weights

Shimano’s new 105 Di2 groupset provides a long-awaited third layer to the model’s digital shifting. Sitting under the Dura-Ace R9200 and Ultegra R8100, this two groupset shares lots of expertise with it, simply barely much less flashy materials and elevated weight.

That is the burden we will concentrate on right here – Shimano offered the requested weights for all parts when the Shimano 105 Di2 12-speed was launched in June 2022. Now we have now a whole set of bands for evaluate and we begin by placing all the things on the scales to learn the way a lot every part truly weighs.

Shimano 105 Di2 R7100: one liner

Here’s a checklist of key options that the Shimano 105 Di2 provides.

First, it is semi-wireless with an unwired connection between the derailleurs and the rear derailleur shifting.

The modifiers lose some performance, resembling the choice so as to add a 3rd button and satellite tv for pc slider seen on Ultegra and Dura-Ace.

As a compensation, the 105 Di2 deal with has house for 2 coin cells as a substitute of 1, which doubles the battery life.

There’s a selection of fifty/34t or 52/36t chainsets with all kinds of crank lengths, however no energy meters.

That is paired with cassettes that supply the 11-34t or 11-36t vary, although not the quicker altering and smoother Hyperglide+ expertise from Ultegra and Dura-Ace.

Like these groupsets, the 105 Di2 makes use of brake rotors and chain borrowed from Shimano’s mountain bike groupsets – on this case the SLX.

The brand new 105 Di2 groupset would not supply rim brakes, and the disc brakes haven’t got the Servowave expertise of their costlier siblings, however like them, the brake pads retract 10 % extra, so you need to get much less brake friction.

Shimano 105 Di2 R7100 groupset part precise weights

Shimano 105 Di2 ST-R7170 derailleur weight

Shifters now click on between 12 gears.
Dave Caudery / Our Media

The brand new 105 derailleurs look almost similar in form and dimension to the Ultegra and Dura-Ace. They’re bigger than Shimano’s older 11-speed digital derailleurs than these groupsets.

As with the Ultegra and Dura-Ace, the brake lever pivot has been moved to supply higher leverage from the hoods protecting extra lever mechanisms.

In contrast to Shimano’s increased spec shifters, there isn’t any ‘hidden’ third button, so you possibly can’t program it to deal with display screen modifications on a motorbike pc or different features.

You may’t match satellite tv for pc sliders both, as a result of there are not any ports. In distinction, the house saved within the lever physique is used to supply every gear lever with two coin cells as a substitute of 1, and Shimano says it extends battery life by as much as 4 years.

The Shimano weighs about 20g lower than our measured weight – most probably as a result of we have now brake fluid in our shift levers.

  • Requested weight: 423g
  • Precise weight: 442g

Shimano 105 Di2 FC-R7100 crankset weight

Shimano says a bigger, semi-compact chainset is coming quickly.
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At launch, the brand new 105 crankset was solely obtainable within the 50/34t configuration. Shimano will even supply the 52/36t possibility at an unspecified date.

160mm, 165mm, 170mm, 172.5mm and 175mm crank arm lengths can be found. It’s also possible to use the Shimano 105 with a non-series 12-speed 50/34t chainset known as the RS520.

The crankset is one part with loads of room to therapeutic massage the weights: the shortest crank size ought to yield helpful weight financial savings. That is why Shimano must be counseled for weighting utilizing the commonest dimension 172.5mm crank. The quantity is sort of excessive in our quantity.

  • Requested weight: 765g
  • Precise weight: 767g

Shimano 105 Di2 FD-R7150 entrance derailleur weight

The entrance derailleur wants to cut back chain noise.
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Designed for brazed derailleur hangers, the 105 entrance derailleur can deal with giant chainrings of fifty tons or 52 tons with a most capability of 16 tooth.

Like Shimano’s different Di2 entrance derailleurs, it self-corrects to forestall chain friction when transferring the cassette. The motor physique is barely bigger than the Dura-Ace or Ultegra and is extra suitable with Shimano’s older 11-speed derailleurs.

Our entrance derailleur was a number of grams lighter than the acknowledged weight.

  • Requested weight: 142g
  • Precise weight: 138g

Shimano 104 Di2 RD-R7150 rear derailleur weight

The longest derailleur cage has a sprocket capability of 36 tons.
Dave Caudery / Our Media

The rear derailleur is the brains of the rig and homes the charging port and Di2 connection. It supplies wi-fi connectivity to shifters, battery and system standing indicator lights, tuning switches, Bluetooth and ANT+ connectivity to bike computer systems and Bluetooth connectivity to smartphones to run the Shimano e-Tube app for system configuration.

A mannequin with a protracted derailleur cage is offered for compatibility with cassettes as much as 36 tooth.

Our 301g measured weight was just about the purpose on the acknowledged weight.

  • Requested weight: 302g
  • Precise weight: 301g

Shimano HG710 cassette (11-34t) weight

The 105 cassette is roughly 100g heavier than Shimano’s highest spec Dura-Ace possibility.
Dave Caudery / Our Media

At present there is just one 105 12-speed cassette within the vary. In contrast to Ultegra and Dura-Ace, this one lacks Hyperglide+ expertise, which is designed to hurry up shifting and make it quieter. In order for you a 1:1 undercarriage to overcome steep slopes, it’s also possible to buy a suitable non-11-36t collection cassette.

Our actual world weight of 360g is above what Shimano claims.

  • Requested weight: 361g
  • Precise weight: 360g

Shimano M7100 chain + fast hyperlink weight

The brand new 12-speed 105 chain exceeds the claimed weight.
Dave Caudery / Our Media

The chain utilized by the 105 Di2 is a part carried over from the Shimano SLX mountain bike groupset.

Once more, our weight is simply over what Shimano claims.

  • Requested weight: 275g
  • Precise weight: 278g

Shimano BT-DN110 battery weight

In contrast to SRAM eTap it has a single battery.
Dave Caudery / Our Media

The 105 Di2 makes use of the identical 3.7 Wh, 7.4 volt DN300 battery because the Dura-Ace and Ultegra to energy the entrance and rear derailleurs. Whereas not an possibility with the 105, there’s a third port for wired connections from increased degree group units to sliders.

That is one other weight determine that’s useless.

  • Requested weight: 53g
  • Precise weight: 53g

Shimano EW-SD50 cable weights

Being semi-wireless, Di2 requires some cables.
Dave Caudery / Our Media

Not a lot to say concerning the cables – you want them to attach your derailleurs to the central battery and so they do not weigh a lot. The truth is, they’re thinner than the previous 11-speed wires (we do not understand how a lot weight you’ve got saved there).

Shimano’s claimed weight for {the electrical} wires to attach the central battery to the derailleurs is just about on level. In any case, there is not a lot to achieve or lose right here, and there is in all probability simply any inconsistency hooked up to issues like cable ties.

  • Requested weight: 19g
  • Precise weight: 21g

Shimano 105 BR-R7070 brake calipers and hoses weight

105 Di2 solely has disc brakes.
Dave Caudery / Our Media

Shimano’s new 105 disc brake calipers have a vent port on the surface for simpler entry. As with the Ultegra and Dura-Ace calipers, the pads retract 10 % greater than previous-generation brakes, so there’s much less probability of these annoying brake friction or clicking.

We weighed the rear caliper and hose at 166g, doubling that to 333g. The precise weight of a pair of calipers shall be barely lower than that as a result of the entrance brake hose is shorter. Shimano claims 141g per caliper, i.e. 282g per pair.

Our weight for brake calipers and hoses is over 50 grams Shimano’s acknowledged weight for the caliper alone. The additional 50g for hoses might be good.

  • Requested weight: 282g
  • Precise weight: 333g

Rotors (SLX RT70 140mm/160mm)

These are the identical rotors from completely different Shimano assemblies.
Dave Caudery / Our Media

As with increased specification 12-speed groupsets, Shimano didn’t attempt to reinvent the wheel with disc brake rotors, however as a substitute redesigned the rotors from the SLX mountain bike groupset, which was additionally used with the 11-speed mechanical 105.

These have a steel-aluminum-steel sandwich and are labeled Freeza as a result of design’s means to cut back warmth build-up within the brake system.

We weighed the rotors 33g lower than Shimano’s acknowledged weight, in all probability as a result of Shimano weighed in for a pair of 160mm rotors, whereas one in all ours is 140mm in diameter.

  • Requested weight: 286g
  • Precise weight: 253g

Shimano 105 Di2 groupset complete weight

Now all we’d like are wheels and a motorbike to connect the components.
Dave Caudery / Our Media

To sum issues up, our complete groupset weight is a distinction of 1.5 %, 42g lower than Shimano’s acknowledged weight for the 105 Di2 groupset in launch supplies. We do not have an alt bracket in our combine although.

The 105 Di2 backside brackets are shared with Ultegra, the Pressfit bearing weighs a claimed 69g and the gear possibility is 77g. There are different components that we don’t embrace, resembling rotor lock rings.

Bicycle producers are likely to therapeutic massage the weights and quote numbers for unpainted frames with bearings, for instance, so it is good that Shimano has given us real-world weight claims.

In comparison with Shimano’s costlier groupsets, our complete for the 105 Di2 is 373g heavier than our measured 2,577g weight for the 12-speed Ultegra Di2 and 511g heavier than Shimano’s claimed 2,439g for the Dura-Ace Di2.

Not unhealthy contemplating you’ve got saved round £2,000 off the Dura-Ace worth. The 105 Di2’s weight additionally comfortably beats SRAM’s competing Competitor groupset, which we calculated at round 3,100g.

  • Claimed complete weight: 2992g
  • Precise complete weight: 2950g

what we do not have

The ultimate piece of the 105 Di2 jigsaw is the model’s new carbon wheelsets. There are 32mm and 46mm deep sections with the identical rim profile as the newest Ultegra and Dura-Ace wheels.

The claimed weight of the 32 mm deep wheelset is 1.504 g; The 46 mm wheelset weighs 1.607 grams. We’re making an attempt to get our arms on them for evaluate, too.

However the subsequent one is to suit the 105 Di2 groupset on a motorbike and got down to check it, so make sure to have a full evaluate.

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