Long cage road derailleur for 1x10 set up

[geomannie]

Hi

I have acquired a set of 1x10 Gevenalle CX shifters which are said to be compatible with 10 speed road shifters. https://www.gevenalle.com/product/cx2/

I want to use them on a hack gavel type bike but I want to get reasonably low gearing. My question is as follows; what 10 speed road compatible derailleur will allow me to use the biggest possible cassette?

In the past I have used a 9 speed Deore XT m772 derailleur which needs the same pull as 10 speed road, but these are no longer easy to find. I can get the 9 speed Deore RD-M592-SGS which goes down to 36 tooth, but I'm not sure if the pull is correct (though I assume it is). Does anyone know for sure?

Does anyone have any other suggestions for a suitable derailleur?

Thanks for your thoughts.

[Cyclothesist]

Tricky - is that Shimano old 10 speed road (105 5700 series) or new 10 speed road (Tiagra 4700) compatible?

[Brucey]

if you use a RD meant for 2x or 3x in a 1x system, it is common that you run out of largest sprocket capacity (LSC) before you run out of total capacity (TC). An inexpensive hanger extender will increase LSC for any given TC, but this is not without consequence. The usual outcome is that the RD is further away from the smaller sprockets than it should be. The increase is easily calculated; just allow for ~2mm extra clearance for every tooth over the original LSC you are. This means you should be able to try and know ahead of time.
My experience is that provided you use new shimano chain, sprockets and RD, the gap needs to be absurdly large before shifting is seriously affected. However, you might not get away with it in the same way with more worn parts.

[geomannie]

Tricky - is that Shimano old 10 speed road (105 5700 series) or new 10 speed road (Tiagra 4700) compatible?

Old 10 speed as I understand.

[Nearholmer]

Isn’t GRX compatible with road pull-ratio? If I’m right, the 1x rear derailleur (RX812 or RX810) goes up to 42T. Worth checking it out? SRAM Rival 1x RD also goes at least as far as 42T, but I don’t know whether they use the same pulls.

[Brucey]

IIRC there is ~0.5mm difference in the cable pull per shift. GRX uses the 'new' shift ratio.

[Nearholmer]

Ah, yes it does; I’ve got Tiagra shifters on my flat bar “gravel bike”.

[Cyclothesist]

Tricky - is that Shimano old 10 speed road (105 5700 series) or new 10 speed road (Tiagra 4700) compatible?

Old 10 speed as I understand.

In which case you're good. See this thread on using an RD M592 with Sora. (Sora uses the old cable pull too)
viewtopic.php?t=135813

[slowster]

I replaced a 10 speed 105 GS derailleur with RD-M592-SGS in order to fit a larger cassette (32t), and although it's early days I have had no problems using the 10 speed 105 STIs with the derailleur.

Edit - It appears that the Gevenalle levers cannot be converted between road and MTB, so ignore what I have written below - https://www.gevenalle.com/product/shift-levers/

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̶[̶u̶r̶l̶]̶h̶t̶t̶p̶s̶:̶/̶/̶w̶w̶w̶.̶s̶j̶s̶c̶y̶c̶l̶e̶s̶.̶c̶o̶.̶u̶k̶/̶g̶e̶a̶r̶-̶s̶h̶i̶f̶t̶e̶r̶s̶/̶m̶i̶c̶r̶o̶s̶h̶i̶f̶t̶-̶b̶s̶m̶1̶1̶r̶-̶1̶1̶-̶s̶p̶e̶e̶d̶-̶b̶a̶r̶-̶e̶n̶d̶-̶s̶h̶i̶f̶t̶e̶r̶-̶r̶i̶g̶h̶t̶-̶h̶a̶n̶d̶/̶[̶/̶u̶r̶l̶]̶

̶[̶u̶r̶l̶]̶h̶t̶t̶p̶s̶:̶/̶/̶w̶w̶w̶.̶s̶j̶s̶c̶y̶c̶l̶e̶s̶.̶c̶o̶.̶u̶k̶/̶g̶e̶a̶r̶-̶s̶h̶i̶f̶t̶e̶r̶s̶/̶m̶i̶c̶r̶o̶s̶h̶i̶f̶t̶-̶b̶s̶m̶1̶2̶r̶-̶1̶2̶-̶s̶p̶e̶e̶d̶-̶b̶a̶r̶-̶e̶n̶d̶-̶s̶h̶i̶f̶t̶e̶r̶-̶s̶h̶i̶m̶a̶n̶o̶-̶m̶t̶b̶-̶c̶o̶m̶p̶a̶t̶i̶b̶l̶e̶-̶r̶i̶g̶h̶t̶-̶h̶a̶n̶d̶/̶[̶/̶u̶r̶l̶]̶

[geomannie]

Hi Folks,

Your suggestions are gratefully received. After having thought deeper about this, I think I might just use the Gevenalle shifter in friction mode. Comparability issues are then greatly reduced. I run friction on other bikes so I am very used to using this mode.

If I run friction, then as I understand most long cage MTB derailleurs should work. Any suggestions for something suitable at a reasonable price? Shimano GRX RD-RX400 perhaps?
https://spacycles.co.uk/m8b0s107p4865/S ... 0-Speed%29

Something that accommodated a 40 or 42 tooth rear cassette might be preferable though.

[colin54]

They've got some good offers on at Banana Industries at the moment on 10 speed MTB mechs, Deore of various sorts .

https://www.bananaindustries.co.uk/coll ... drivetrain

[geomannie]

They've got some good offers on at Banana Industries at the moment on 10 speed MTB mechs, Deore of various sorts .

https://www.bananaindustries.co.uk/coll ... drivetrain

Thanks for that. One of those long cage derailleurs at those reduced prices will be perfect.

[colin54]

You can check the spec's - capacities here if you didn't know, just enter the part number RD- etc..
https://si.shimano.com/en/#/

[slowster]

The 10 speed MTB rear derailleur requires approximately 50% more cable pull per shift than a 10 speed road rear derailleur (or a 9 speed rear derailleur). I think the 11 and 12 speed rear derailleurs similarly use more cable pull. I suggest you check the barrel diameter of the shifter before ordering a 10 (or 11 or 12) speed MTB derailleur.

I would also check what the range of movement of the Gevenalle lever is. On a down tube boss a down tube lever has a maximum range of movement of 180 degrees.

I roughly calculated the cable pull capacity of friction levers with different barrel diameters here - viewtopic.php?p=1817348#p1817348.

[mcshroom]

Shimano have a new Essa 8sp group set that includes a 1x derailleur with a clutch and 45t max sprocket. It's compatible with old 8sp road/mtb pull so should be the same as old 10sp Shimano road.

Otherwise there's another 8sp derailleur, the Acera RD-M3020, which has a 40t max sprocket, and isn't 1x specific, but doesn't have the clutch.