105 2x12 - R7170 (R7150) / R7120 (R7100) - di2 / mechanical (MY2024)

[JaeOne3345]

What are you all even on about? What does this have to do with R7100? LOL.

Go for a ride.

[SystemShock]

What are you all even on about? What does this have to do with R7100? LOL.

Go for a ride.

Yeah, maybe this has gotten a bit silly.

Fun, tho'... if you like a debate.
.

[Hexsense]

I wonder if it'd be a logical move if r7150 is wireless only with no di2 ports at all.

This is in contrast to Ultegra /DA that can run either wired or wireless and they have ports for remote shifters, I assume r7150 to only work in wireless mode with no port for remote shifters either.

That way, r7150 is logically a lower spec tier than r8150. Yet they don't have to artificially inflate a lot of weight like Rival Axs. They could be the same weight as r8150 but is shorter and has less features.

Applying this idea elsewhere,
Other than skip fins on brake pads and brake rotor, I don't really see anything that can be removed from fd and rd to reduce feature and save cost at the same time in this manner though. Are there any physical parts Shimano can skip ?

[Vincentsmoox]

Ok interesting debate, many information I get

So, can I run smaller chainring on shimano 12sp?
If yes what crankset I can use?


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[pdlpsher1]

Ok interesting debate, many information I get

So, can I run smaller chainring on shimano 12sp?
If yes what crankset I can use?


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I've asked this question but gotten no responses. I have a 9200 group on order and I plan to try it with a GRX (48/31) crank. I believe the new 12-speed has already been used with smaller chainrings for CX and it works. But the CX chainrings have small tooth gap difference. I'm unsure if the 12-speed FD can manage to shift the GRX's 17 tooth gap difference. Once I test it out I will report my findings...

[pdlpsher1]

I wonder if it'd be a logical move if r7150 is wireless only with no di2 ports at all.

This is in contrast to Ultegra /DA that can run either wired or wireless and they have ports for remote shifters, I assume r7150 to only work in wireless mode with no port for remote shifters either.

That way, r7150 is logically a lower spec tier than r8150. Yet they don't have to artificially inflate a lot of weight like Rival Axs. They could be the same weight as r8150 but is shorter and has less features.

Applying this idea elsewhere,
Other than skip fins on brake pads and brake rotor, I don't really see anything that can be removed from fd and rd to reduce feature and save cost at the same time in this manner though. Are there any physical parts Shimano can skip ?

I could think of a couple additional items they could use to differentiate the 105.

- delete the buttons on the top of the hoods. The 8150 and 9250 both have them. The 8050 lacks them.
- use bigger (presumably cheaper) motors for the FD. The 8050/815 have substantially bigger motors than those in the 9150.

[Hexsense]

I could think of a couple additional items they could use to differentiate the 105.

- delete the buttons on the top of the hoods. The 8150 and 9250 both have them. The 8050 lacks them.

You sure 8050 doesn't have top button?
My 8070 (di2 hydraulic) has it.

I know 6870 doesn't have one. But 8070 does.

Anyway, yeah. They could remove that button and simplify the hood and shifter design.

[pdlpsher1]

I could think of a couple additional items they could use to differentiate the 105.

- delete the buttons on the top of the hoods. The 8150 and 9250 both have them. The 8050 lacks them.

You sure 8050 doesn't have top button?
My 8070 (di2 hydraulic) has it.

I know 6870 doesn't have one. But 8070 does.

Anyway, yeah. They could remove that button and simplify the hood and shifter design.

You're correct. It's the older 6870 that lacks them. My bad.

[Vincentsmoox]

Ok interesting debate, many information I get

So, can I run smaller chainring on shimano 12sp?
If yes what crankset I can use?


Sent from my iPhone using Tapatalk

I've asked this question but gotten no responses. I have a 9200 group on order and I plan to try it with a GRX (48/31) crank. I believe the new 12-speed has already been used with smaller chainrings for CX and it works. But the CX chainrings have small tooth gap difference. I'm unsure if the 12-speed FD can manage to shift the GRX's 17 tooth gap difference. Once I test it out I will report my findings...

That is Interesting theory, it should be work but dont know If they can perfectly shifting or not Since grx chainring have 17t difference instead 16t on Shimano road.

But the problem is grx crank is weight More than ultegra, maybe theres other lighter option with 16T or less difference?


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[WorkonSunday]

You really can't spin faster than 100 RPM?

Condolences.
.

Many people can spin quite fast, if it's just going for maximum cadence, or peak maximum power.

But if you're actually trying to put down consistent power while spinning super fast it becomes a whole lotta harder. And having to go above your self selected cadence is a lot more taxing than being able to use your self selected cadence.
.

Thing is, 100 RPM just isn't that fast. A *lot* of ppl shoot for 90 RPM as their 'standard' comfortable cadence, and the max in the efficient range (which is kinda what I think you're alluding to) is about 120-130 RPM for most.

But, to just plain not be able to go above 100 RPM? Ouch.
.

it depends on the heart rate curve as well. just imagine spinning 120rpm while churing out only 70watts. work load is very little but just by spinning at such high cadence, the heart rate wont be in zone 2, some may even be in zone 4.

Anyway, enough off topic responses.

[ooo]

105 fd have non-aero design (like FD-R8050, not like FD-R8150), CL 44.5, also works with 43.5
105 cranks will be offered in 50-34T only, it will be not offered in 52-36T
105 cassette will be offered in 11-34T only, it will be not offered in 11-30T
additional non-series 12s cassette 11-36T, cog sizes on page 4 of this topic

non-series 105 level wheels C32, C46:

[Usernamealex]

Finally a more affordable Di2 disc grouppo! Hope the package includes a stock power meter.

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[ooo]

Unfortunately, no power meter option.

[CustomMetal]

Keep it on topic, all future off topic messages will be removed. If you want to discuss something off topic then start a new thread

[StiffWeenies]

105 fd have non-aero design (like FD-R8050, not like FD-R8150), CL 44.5, also works with 43.5
105 cranks will be offered in 50-34T only, it will be not offered in 52-36T
105 cassette will be offered in 11-34T only, it will be not offered in 11-30T
additional non-series 12s cassette 11-36T, cog sizes on page 4 of this topic

non-series 105 level wheels C32, C46:

I thought those wheels were meant for Gravel?