Gravel / Gravé / Gnarmac / Groad / ATB

Is there an actual reason a 1x SRAM rear mech won't work on a 2x system?

How would it know?

The chain is getting pulled but the cable is not?

Will it break, is it just marketing guff etc.

New Salsa Warroad. Marketed as endurance road / all-road, but looks ideal for grus. Tyre clearance and all the mounts too.

that's a lovely looking salsa indeed

The X-horizon ones won't. They have a horizontal parallelogram, and the movement of the jockey wheel laterally is controlled by the chain shortening as you shift up the cassette. A front shift will fuck it up.

As I expected.
Thank you for the explanation.

Next question.

What options are there for a SRAM/Shimano 2x 10 speed road rear mech that can get up to 36T?

For Shimano, it depends which 10 speed pull ratio you're using, but I'm currently having success with 5700 series 105 shifters and a non-series RD-R350-10-SS rear mech. It's only rated to 34t max, but I'm using it with 36t without any need to faff about with the B-tension screw or owt.

Thanks.
I'm actually trying to get up to 40 using giant B screw and/or wolf tooth.
If a mech is rated to 36 I'm hoping to crank it up.

I'm using a SRAM X0 10sp mech on a 42t cassette on my mtb. Hanger geometry dependent, but any SRAM mountain mech should do it.

This is my new favourite thing for all-road bikes

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F273448013341

Mountain derailleur geometry and SRAM Red quality, with a lower profile and better routing.

Total cage capacity might be your only sticking point with 11-40 and two chainrings.

Currently also using 5700 shifters, but with a M772 rear mech, which is 9sp but works due to same cable pull ratio etc.
Good link here: https://en.wikibooks.org/wiki/Bicycles/Maintenance_and_Repair/Gear-changing_Dimensions#Rear_Shift_Ratios

Needs to be a road mech due to the cable routing on my frame.

This is my new favourite thing for all-road bikes

https://rover.ebay.com/rover/0/0/0?mpre=­https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm­%2F273448013341

This is what I'm looking for!

Leg end.

Thanks for the link.
Super helpful.

I use a dropout extender for an Apex RD / 36t.

Are you sure about this? I can't see how the lateral movement of the jockey wheel is controlled by the chain length? It just looks like the distance from the cog to jockey wheel is controlled by the chain length, but the lateral movement is still controlled only by cable.

It sounds like that is actually the whole point of x-horizon, that vertical forces like chain slap wont move the parallelogram and thereby the jockey wheel laterally to create "ghost shifting".

I'm no engineer, but that's what I get from the below links.
https://www.youtube.com/watch?v=bQEMySJX0DA

https://www.sram.com/sram/mountain/technologies/x_horizon

Sorry, I meant vertical movement!

Okay, that makes sense.

But then I can't see why you could not use it in a 2x setup? The only downside would be that the jockey wheel could end up further away from the cog than with a conventional RD, but it would still be laterally aligned with the cog.

Because even if the range of movement of the cage/jockey wheel (which is designed for 10-42) can cope with something like an effective 45t chain growth, which I'm not sure it could, to stop the jockey wheel hitting the cassette in the small ring, you'd have to have it miles away in the big ring (where you spend most your time) and suffer crap shifting.

Plus they only come in one cage length.

There is a specific 2x11 GX Mech, without the X-Horizon geo, but you said you couldn't use it with your routing.

I have the GX which I used on the old. New routing means this set up was out the window.

I'm pretty sure I'm going with the via gt mech.
It's impressive stuff and light too as well as cheap.

I'm intrigued by what routing you have that rules out MTB mechs.

But yeah, that Via one is really nice. I put one on Kate's TJD and I'm a bit jealous of it

Not so much ruled out but don't want to have to keep trying mechs to find one that works.
Road mechs are a safe bet.

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