Shimano di2 groupsets from aliexpress

[maxpet]

The R7150 RD+FD shifts exactly the same as R8150. The motors are the same.

Not true, FD is different (105 FD is like Ultegra / Dura Ace 11s), you can even see it in the app where the adjustment process is different

[kbernstein]

The R7150 RD+FD shifts exactly the same as R8150. The motors are the same.

nope. FD is completely reworked on r8100
RD is also one of the biggest weight loss parts on ultegra

[Cowhole_69]

The R7150 RD+FD shifts exactly the same as R8150. The motors are the same.

That is incorrect, completely different and physically smaller plus faster shifting.

However an R7150 FD is basically an R8050 FD.

[fat-tony]

That is incorrect, completely different and physically smaller plus faster shifting.

However an R7150 FD is basically an R8050 FD.

The actual actuation speed and power of the RD shift motor are functionally identical. Absolutely no reason to change a RD7150 for a RD8150

[Super_davo]

The actual actuation speed and power of the RD shift motor are functionally identical. Absolutely no reason to change a RD7150 for a RD8150

I can say as the owner of bikes with R8100, R7100 and indeed R9200 that the front mechs on R7100 are not the same (R8100 and R9200 essentially are). R7100 is the older design, same as R9100 or R8000 and larger, heavier, slower.
As to whether you notice any of this on the road I would have my doubts - I can't - but you certainly can on the mech stand side by side.
FWIW the only improvement Ultegra brings over 105 that I really miss is the bonus buttons on the shifters.

[redpx]

Whats the best time to grab some groupset from Aliexpress?
Need one for my new Lightcarbon Frame thats will arrive in 2-3 Months. Want to order an 105 DI2 Groupset.

[fat-tony]

I can say as the owner of bikes with R8100, R7100 and indeed R9200 that the front mechs on R7100 are not the same (R8100 and R9200 essentially are). R7100 is the older design, same as R9100 or R8000 and larger, heavier, slower.
As to whether you notice any of this on the road I would have my doubts - I can't - but you certainly can on the mech stand side by side.
FWIW the only improvement Ultegra brings over 105 that I really miss is the bonus buttons on the shifters.

If you read the post you quoted, you will notice that I was talking about the RD, not FD.

[raisinberry777]

The R7150 RD+FD shifts exactly the same as R8150. The motors are the same.

[fat-tony]

Wrong quote my dude. Please read the correct one.

The actual actuation speed and power of the RD shift motor are functionally identical. Absolutely no reason to change a RD7150 for a RD8150
[/quote

[ZacItaly15]

what is the perfect balance between weight/cost/function in the 11 speed di2 groupset (105/Ultegra/DA)?

It seems that the Ultegra shifter are identical to DA (button/reach) and you can save 20g with titanium aftermarket brackets.
The from mech seems to be DA/ultegra identical
The rear mech are internally identical DA/Ultegra (motor/gear) but the 50g difference?

[maxpet]

what is the perfect balance between weight/cost/function in the 11 speed di2 groupset (105/Ultegra/DA)?

It seems that the Ultegra shifter are identical to DA (button/reach) and you can save 20g with titanium aftermarket brackets.
The from mech seems to be DA/ultegra identical
The rear mech are internally identical DA/Ultegra (motor/gear) but the 50g difference?

Probably full 105 with Ultegra FD and aftermarket crankset/cassette

[kbernstein]

Probably full 105 with Ultegra FD and aftermarket crankset/cassette

Mostly agreed. Personally I would also ditch shimano rotors as a priority.

Also worth noting: the old ultegra/new 105 FD is apparently more outwards, meaning despite being bulkier it can fit larger rear tires if it's a limitation

[Da11as]

what is the perfect balance between weight/cost/function in the 11 speed di2 groupset (105/Ultegra/DA)?

It seems that the Ultegra shifter are identical to DA (button/reach) and you can save 20g with titanium aftermarket brackets.
The from mech seems to be DA/ultegra identical
The rear mech are internally identical DA/Ultegra (motor/gear) but the 50g difference?

12 speed maybe? I went for Ultegra derailleurs (better shifting and substantially less weight) and 105 levers+brakes (no benefits apart from hood buttons). As for the rest, aftermarket cranks and rotors are better than what you get from a full groupset. Dura ace chain (fastest) and cassette is a go to if you prefer hot waxing.

[fat-tony]

12 speed maybe? I went for Ultegra derailleurs (better shifting and substantially less weight) and 105 levers+brakes (no benefits apart from hood buttons). As for the rest, aftermarket cranks and rotors are better than what you get from a full groupset. Dura ace chain (fastest) and cassette is a go to if you prefer hot waxing.

The 12 speed rear derailleur 105 gives the same shifting performance as the ultegra.

[crazyravr]

My take on this.
Rear mech - 105 same as ultegra for shifting
Front mech - Ultegra superior
Shifters - 105 perfect unless you need the buttons for some reason
Casette and chain - ultegra makes sense (way superior shifting over 3rd party)
Chainrings - ultegra (way superior shifting over 3rd party)
Cranks - ultegra or QUALITY carbon

However, if I were buying from zero.............. 100% all ultegra.