1x12 Drivetrain for Road bikes? What's your opinion?

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Skunkworks
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by Skunkworks

Hi weightweeeenies!

SRAM introduced their new 1x12 drivetrain for MTB.
How about 1x12 for road cycling?

I just wonder your opinions :)

They are definately lighter than 2 chainring drive train.
And I guess there could be a 'golden' gear ratio between 1 chain ring and 12 casettes.
But I don't know this gear ratio would be effective for pro athletes or us, weeenies.

morrisond
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by morrisond

A 10-36 Cassette 12 Speed Cassette could be quite interesting with a 46 tooth front. It would be like 30-28 in the back (very rough guess).

Or do 11-36 with less spread between jumps and a 50 on the front, would be like 34/28 on the backish.

You have to keep the Cassette small or you lose all the weight advantages of losing the FD.

From a Weight Standpoint this would make a lot of sense with eTap.

by Weenie


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bm0p700f
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by bm0p700f

I am not convinced I would want the jumps in cadance that such a cassette would bring and all to save a very small ammount of weight. I am all for lighter kit but I would rather there be no downside.

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Rick
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by Rick

I'm waiting for 12 x 2 :mrgreen:

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ergott
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by ergott

12th cog relies on larger size to clear spokes.

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Grill
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by Grill

Only interesting if they add a 10t, otherwise I see no point.

natiedean24
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by natiedean24

My opinion is that the large jumps in cogs would not be desirable.


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ergott
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by ergott

Grill wrote:Only interesting if they add a 10t, otherwise I see no point.


Rear cassette is 10-50.

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wheelsONfire
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by wheelsONfire

10-50! I am particularly found with almost linear ratio so i think i will stick to 2*11.
But it's really tempting to let go of the FD.
Also like that clutch operated RD.
Bikes:

Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)


Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.

morrisond
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by morrisond

natiedean24 wrote:My opinion is that the large jumps in cogs would not be desirable.


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What your forgetting is that the Current normal 52/36 - 11/28 setup - 7 of the ratio's are basically identical (you can replicate 7 of the same ratio's in the big ring or small ring) effectively making a 22 sp 2x transmission a 15 Sp transmission

Before 11sp we got along great with 10 sp and before that 9sp.

The gaps are not as big as you think.

Go play with the Sheldon Brown gear calculator.

That being said my all-time favourite cassette was an 11-23 10SP.

I would love a 12SP 11-27 or even an 12-27

Delorre
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by Delorre

natiedean24 wrote:My opinion is that the large jumps in cogs would not be desirable.


Can't agree more!! Even on my very well spaced 12-25 11 sp cassette, I find the gap between 19 and 21 (10,5%) already to much on a climb. Can't imagine riding with an 1*11 drivetrain and 11-36 cassette, this give jumps of 10 à 15% between every cog :x

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eliflap-scalpel
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by eliflap-scalpel

i had 1x10

i have 1x11 now

FD is dead, on the asphalt too
http://eliflap.it/

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eliflap-scalpel
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by eliflap-scalpel

morrisond wrote:A 10-36 Cassette 12 Speed Cassette could be quite interesting with a 46 tooth front. It would be like 30-28 in the back (very rough guess).

Or do 11-36 with less spread between jumps and a 50 on the front, would be like 34/28 on the backish.

You have to keep the Cassette small or you lose all the weight advantages of losing the FD.

From a Weight Standpoint this would make a lot of sense with eTap.


is better 10-38 or 39 with 12 speeds with 46T
http://eliflap.it/

Derf
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by Derf

I'm still trying to figure out what's so wrong with 2x10 with a decent spread, much less 2x11. I don't find myself in/out of my small ring that much that it remotely bothers me. Understand that many of the ratios are redundant, but, still, that allows you to stay in one ring versus needing to endlessly switch between big and little rings.

Also, everyone's suggested permutations are going to be worse from a cross-chaining/friction perspective. Seems like something that lacks generality. Probably just fine for flatter terrain (but why build a bike so restrictive, when the cost of *not* doing so is so small?)

RyanH
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by RyanH

I don't get it. SRAM Force 1's RD is 261g and the 46t XSync ring is 98g (50t is estimated at 124g based on the progression of weights). So, you gain almost 100g in the RD, your front chainring weighs as much as most good 2x chainrings combined, while dropping 70g for a FD and 30g for cables. Oh, and the cassette has to be a pizza platter for most which is at least +50g or so.

I think it'd be neat to have a 1x10 with an 11-23 and 48 or 50t up front to do flattish rides, but only as neat as having a single speed/fixed gear bike, except the latter is the truly simple one.

by Weenie


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