Dura-Ace Road Bar End Shifter and MTB Derailleur Confusion

[confusedcyclist]

I just picked up a bargain Surly LHT frame on ebay, currently drawing up a table of components for my DIY build but have been struggling with the gearing/shifters. I've only ever experienced drop bars with STI levers, and now want to give bar ends a go.

I want to put on a triple crankset, and use 10 speed dura-ace bar end shifters, but I understand these are road specific. In order to build a 10 speed drivetrain and have the range of gears required on a touring bike, I'll need to use a long cage MTB rear derailleur. I understand that MTB RDs are not compatible with the bar end shifters because the pull ratio is different.

So how do I go about getting a long cage MTB RD to work with 10 speed MTB cassette and road bar end shifters? I can see Surly managed to get their shifter to work with a 9 speed MTB RD and cassette. What am I missing?

I'm not particularly set on 10spd, I'd happily use 9spd, but I just don't understand how Surly have managed to make the MTB and road shifters work together?

Road RDs don't come with the large cage size to take a MTB cassettes as far as I know?

 

[Yellow Saddle]

From 10-speed on, Shimano's road and MTB derailers are no longer compatible. 9 and down works just fine.

It is easy to see which MTB derailers are not compatible since they have Dynasys written on them.

Do you have a reference for the Surley combination? Yo sure it is 10 speed?

 

[boydj]

I have these - https://www.sjscycles.co.uk/gear-shifters/diacompe-bar-end-shifters-power-ratchet-friction-control/ - on one bike. Friction shifters don't take long to get used to and they make the bike very flexible in terms of swapping rear wheels, since make and number of gears don't matter. The type of rear mech is also irrelevant.

 

[confusedcyclist]

@Yellow Saddle thanks, the surly combination is a 10 speed, based on the cassette they claim is part of stock build. Link in OP.

@boydj I didn't know you could get friction systems, that means I can put 10 speed on, great! They are cheaper too which is a bonus!

 

[Yellow Saddle]

@Yellow Saddle thanks, the surly combination is a 10 speed, based on the cassette they claim is part of stock build. Link in OP.

They do it by fitting a Microshift shifter. This isn't a Shimano product and my guess is Microshift caters for that particular market - 10-speed with long-cage Shimano RDs.

 

[raleighnut]

Not sure if the 10 speed Shimano Dura-ace are the same as my 8/9 speed Dura-ace ones but on those indexing is 'switchable' to friction. The 9 speed Dura-ace ones were cheap because for some reason known only to Shimano the spacing of the cassette is unique to that range although they do shift OK'ish on standard 8 speed. I'll see if I can locate which series they are.

 

[raleighnut]

These are the shifters,

http://www.googleadservices.com/pag...ahUKEwiLrMuhprDQAhWHJcAKHacjCTIQvhcIJg&adurl=

Although they seem to be compatible with Mega 9 rear mechs too.

these.

http://www.googleadservices.com/pag...ahUKEwjJ1Z_8prDQAhUGDcAKHan-BA8Qwg8IMg&adurl=