Next generation of Dura-Ace Di2

Discuss light weight issues concerning road bikes & parts.

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gSporco
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by gSporco

MattBeOne wrote:
Fri May 20, 2022 10:04 pm
Can anyone point out how to adjust the free stroke for the 12sp Shimano groupsets?
Can't seem to find anything online...
Underside of the lever there is small opening for an Allen wrench..

Here is the page in the manual: https://si.shimano.com/#/en/iDM/RADBR10 ... ADJUSTMENT
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satanas
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by satanas

Someone mentioned Recon cassettes for Shimano 12, but there wasn't much info at the link. On Recon's website they list not two but five sizes, some in different colours. There are the two current Shimano sizes (11-30 & 11-34), plus the projected 11-28, all with the same intermediate cogs as Shimano, plus 11-29 & 11-32 which have the same intermediate cogs as Campag 12.

https://www.recon-harry.com.tw/products_detail/1/1/45

Perhaps they might get around to offering other sizes if there's demand, like say 12-28/29 or 11-36, etc.

ichobi
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by ichobi

Anyone weights that 9200 chain ring? I couldnt really find the weight online anywhere. Shimano doesnt specify specific ring weight only in combination with cranks.

50/34 and 52/36 anything you got.

I am contemplating the thm crank for my incoming 12spd da di2 but not wanting to go carbon ti rings route. If the da rings are sufficiently light then i might as well use them.

ricerocket
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by ricerocket

satanas wrote:
Sun May 22, 2022 6:47 am
Someone mentioned Recon cassettes for Shimano 12, but there wasn't much info at the link. On Recon's website they list not two but five sizes, some in different colours. There are the two current Shimano sizes (11-30 & 11-34), plus the projected 11-28, all with the same intermediate cogs as Shimano, plus 11-29 & 11-32 which have the same intermediate cogs as Campag 12.

https://www.recon-harry.com.tw/products_detail/1/1/45

Perhaps they might get around to offering other sizes if there's demand, like say 12-28/29 or 11-36, etc.
I'm guessing you'll lose Hyperglide+, which is totally not worth the 35g.

In my opinion, it's the best improvement Shimano has made w/ this groupset.

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pdlpsher1
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by pdlpsher1

ichobi wrote:Anyone weights that 9200 chain ring? I couldnt really find the weight online anywhere. Shimano doesnt specify specific ring weight only in combination with cranks.

50/34 and 52/36 anything you got.

I am contemplating the thm crank for my incoming 12spd da di2 but not wanting to go carbon ti rings route. If the da rings are sufficiently light then i might as well use them.
They should be the same as the 9100 rings, which are pretty light.

P2M came out with a new lightened four bolt PM. Pair that with Rotor Aldhu carbon arms and 9200 rings should give you a light setup. The problem is the unavailability of 9200 rings.


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Dorpel
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by Dorpel

I installed the new R8150 but my disc brakes are squeeling like hell. Rotors and pads are perfectly clean. Anyones else having this issue?

pamoreira
Posts: 30
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by pamoreira

ricerocket wrote:
Sun May 22, 2022 8:01 am
satanas wrote:
Sun May 22, 2022 6:47 am
Someone mentioned Recon cassettes for Shimano 12, but there wasn't much info at the link. On Recon's website they list not two but five sizes, some in different colours. There are the two current Shimano sizes (11-30 & 11-34), plus the projected 11-28, all with the same intermediate cogs as Shimano, plus 11-29 & 11-32 which have the same intermediate cogs as Campag 12.

https://www.recon-harry.com.tw/products_detail/1/1/45

Perhaps they might get around to offering other sizes if there's demand, like say 12-28/29 or 11-36, etc.
I'm guessing you'll lose Hyperglide+, which is totally not worth the 35g.

In my opinion, it's the best improvement Shimano has made w/ this groupset.
Not only it's lighter, it's much cheaper than DA - that's also a very relevant factor to consider when pondering how much is Hyperglide+ worth.

ricerocket
Posts: 574
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by ricerocket

pamoreira wrote:
Sun May 22, 2022 4:35 pm
ricerocket wrote:
Sun May 22, 2022 8:01 am
satanas wrote:
Sun May 22, 2022 6:47 am
Someone mentioned Recon cassettes for Shimano 12, but there wasn't much info at the link. On Recon's website they list not two but five sizes, some in different colours. There are the two current Shimano sizes (11-30 & 11-34), plus the projected 11-28, all with the same intermediate cogs as Shimano, plus 11-29 & 11-32 which have the same intermediate cogs as Campag 12.

https://www.recon-harry.com.tw/products_detail/1/1/45

Perhaps they might get around to offering other sizes if there's demand, like say 12-28/29 or 11-36, etc.
I'm guessing you'll lose Hyperglide+, which is totally not worth the 35g.

In my opinion, it's the best improvement Shimano has made w/ this groupset.
Not only it's lighter, it's much cheaper than DA - that's also a very relevant factor to consider when pondering how much is Hyperglide+ worth.
$250 versus $300 USD isn't that much cheaper.

BdaGhisallo
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Joined: Wed Mar 17, 2004 1:38 pm

by BdaGhisallo

With the 12sp drivetrains, is there still the option in the E-Tube software to switch off the 'gear control' - the feature that stops you shifting into the two smallest cassette cogs when on the small chainring? If it's there, is it chainring size dependent, as it is with the 11sp setups?

K4m1k4z3
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by K4m1k4z3

BdaGhisallo wrote:
Sun May 22, 2022 5:00 pm
With the 12sp drivetrains, is there still the option in the E-Tube software to switch off the 'gear control' - the feature that stops you shifting into the two smallest cassette cogs when on the small chainring? If it's there, is it chainring size dependent, as it is with the 11sp setups?
You can absolutely shift into those gears. I use it all the time when storing the bike. No need to set up anything IIRC. 52/36 + 11/30 R8100.
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BdaGhisallo
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by BdaGhisallo

K4m1k4z3 wrote:
Sun May 22, 2022 5:02 pm
BdaGhisallo wrote:
Sun May 22, 2022 5:00 pm
With the 12sp drivetrains, is there still the option in the E-Tube software to switch off the 'gear control' - the feature that stops you shifting into the two smallest cassette cogs when on the small chainring? If it's there, is it chainring size dependent, as it is with the 11sp setups?
You can absolutely shift into those gears. I use it all the time when storing the bike. No need to set up anything IIRC. 52/36 + 11/30 R8100.
Thanks.

pmprego
Posts: 1876
Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

Three questions for people here with experience in these things:

- Besides weight and price, any performance differences between r8170 (ultegra 12spd) and r9200 (DA 12spd)? I've noticed r9200 uses a one-piece caliper while r8170 uses a two-piece one.

- If one was to mix r8170 with r9200 components and trying to be very conscious of final price, what would be the end result that people here recommends?
-- I've noticed that the calipers give an interesting weight saving. The problem is getting the calipers in r9200 alone. It seems way more common to see listings for shifter+calipers coupled together.
-- The cassette is also a good weight saving and given that I use two different wheelsets (training and racing) I was considering the r8170 for the training wheels and the r9200 for the racing wheels.

- W.r.t. the crank are there any NON-power GXP option as an interesting alternative to the heavy shimano cranks?
Last edited by pmprego on Mon May 23, 2022 1:46 pm, edited 1 time in total.

JOliver
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Joined: Sun May 22, 2022 6:01 pm

by JOliver

riochang, did you try to mount the DA chainrings to the clavicula crank ... will they fit? I was considering the same carbon ti evo / clavicula setup, but then saw your post about the decrease in performace. Thanks for sharing your experience, it is very helpful

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ultimobici
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by ultimobici

pmprego wrote: W.r.t. the crank are there any NON-power GXP option as an interesting alternative to the heavy shimano cranks?
Why on earth would you want a GXP crankset?


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Discodan
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by Discodan

Errr, “as an interesting alternative to the heavy Shimano cranks”?


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