silent_bob Posted December 9, 2013 Share Morning Hubbers, I'm in the process of acquiring parts to replace the 3x9 Shimano LX drive train on my bike with 2x10. I have a few technical questions and was hoping to find some guidance here on what will work with what. Firstly, my bike has a threaded, external BB (RaceFace 73mm). Will a SLX M675 crank be compatible with this? I see these cranks ship new with the BB included and I just want to make sure the crank will fit my current BB (the SLX crank I found thats for sale excludes the BB). Secondly, I would like to install a SLX M675 rear derailleur (medium cage) with the M675 crank. Would I need a chain guide with this configuration? Thanks Edited December 9, 2013 by silent_bob Link to comment Share on other sites More sharing options...
NotSoBigBen Posted December 9, 2013 Share I would not think a chain guide would be needed with 2*10 as the FD will do that job anyway. As I recall Raceface BB's are compatible with Shomano ..... Link to comment Share on other sites More sharing options...
silent_bob Posted December 9, 2013 Share I would not think a chain guide would be needed with 2*10 as the FD will do that job anyway. As I recall Raceface BB's are compatible with Shomano .....Great, thank you Link to comment Share on other sites More sharing options...
Caerus Posted December 11, 2013 Share I currently have a 3x10 XT Crankset, and would like to go to 2x10. with the current deals at either Easybike or CWC, the prices are too good not to do it now. I already have an 11/36 10 Speed cassette, and a set of 10 speed shifters, both XT as well Two questions, will my current 9 speed front derailleur work? Secondly, which rear derailluer should I go for long, medium or short, I'm looking at the Xt with clutch mechanism. What is the difference between them besides the length and how do I know what to get. Many Thanks Link to comment Share on other sites More sharing options...
ACM Posted December 11, 2013 Share Are you currently running 2x9 or 3x9? Can't exactly understand from info supplied. For 2x10 you would need a 2x FD (front derai...) & 2x front shifter. Your current xt shifters might be able to switch between 3x and 2x (if it's the later/new xt shifters) In terms of RD (rear dera...)... Short, medium, long depends on your shifting and how you ride your gear ratios and you front & rear chain ring/casette sizes (ie how long chain you need and how much chain slack the RD should pickup). On a 2x10 you would typically have 38&26 front and 11/36 (like you have) back on which you'll run a medium cage. I have 2x10 with 38/24 front and 11/36 back and I've gone for long cage (no clutch though). Lots of information on the web available regarding cage lenght. Enjoy the convertion :-) Link to comment Share on other sites More sharing options...
Caerus Posted December 11, 2013 Share My current set up on the bike is a 3x10 XT crankset(42/32/24), with 9 speed rear cassette and 9 speed front derailluer and 9 Speed rear derailleur & 9 Speed Shifters. The 3x10 crank works perfectly with the 9 speed setup I currently have. I have a 11/36 10 speed cassette for the conversion , as well as I have purchased some new 10 speed XT shifters(which I can use as 2x10 or 3x10). I just need to go buy a rear dearilleur, but not sure which one ie long, medium or short XT Clutch, also not sure of the 9 Speed front derailleur will work as well, as I currently use it with as for a 3x9 setup, or would I have to also buy a new one to work with a 2x10 setup? I plan to take off one of the rings on the 3x10 crankset and make it a 2x10 rather. I hope this is enough info? Edited December 11, 2013 by Caerus Link to comment Share on other sites More sharing options...
Caerus Posted December 12, 2013 Share I think I will also need to also get a larger middle ring if I'm to take off the large ring? Link to comment Share on other sites More sharing options...
droo Posted December 12, 2013 Share You don't need a 2x front mech or shifter, that's what limit screws are for. A 10sp one will improve shifting because it has a narrower cage, but isn't essential. As for the RD, have a read through this. (If I wasn't doing cartwheels round the shop yesterday I would have helped you out - timing just wasn't great...) Bobbo_SA and Caerus 2 Link to comment Share on other sites More sharing options...
silent_bob Posted December 12, 2013 Share I currently have a 3x10 XT Crankset, and would like to go to 2x10. with the current deals at either Easybike or CWC, the prices are too good not to do it now. I already have an 11/36 10 Speed cassette, and a set of 10 speed shifters, both XT as well Two questions, will my current 9 speed front derailleur work? Secondly, which rear derailluer should I go for long, medium or short, I'm looking at the Xt with clutch mechanism. What is the difference between them besides the length and how do I know what to get. Many Thanks I have been lucky enough to source most of the parts I require (for a 2x10 conversion) with the help of some Hubbers and CWC / EasyBike. I really wanted to get a medium cage rear derailleur (simply for the additional ground clearance - I'm not to clued up on the mechanics of the different length of cages) but these seem to be in short supply from where I have looked locally and I settled for a long cage. Its what I currently using anyway. Edited December 12, 2013 by silent_bob Link to comment Share on other sites More sharing options...
Caerus Posted December 12, 2013 Share You don't need a 2x front mech or shifter, that's what limit screws are for. A 10sp one will improve shifting because it has a narrower cage, but isn't essential. As for the RD, have a read through this. (If I wasn't doing cartwheels round the shop yesterday I would have helped you out - timing just wasn't great...)Thanks Droo, I see you were crazy busy yesterday, thanks again for the fantastic service and turn around Link to comment Share on other sites More sharing options...
Caerus Posted December 12, 2013 Share I have been lucky enough to source most of the parts I require (for a 2x10 conversion) with the help of some Hubbers and CWC / EasyBike. I really wanted to get a medium cage rear derailleur (simply for the additional ground clearance - I'm not to clued up on the mechanics of the different length of cages) but these seem to be in short supply from where I have looked locally and I settled for a long cage. Its what I currently using anyway. Yip, seems the medium cages are in very short supply at the moment, no one in the country seems to have any. I guess I'll have to wait till I get to Durbs to see, or otherwise CRC is my friend. I don't feel like settling though, good to hear you got all sorted out. silent_bob 1 Link to comment Share on other sites More sharing options...
Erroli8a8 Posted December 12, 2013 Share Dont forget that you will need a 10 speed chain as well. Link to comment Share on other sites More sharing options...
Caerus Posted January 13, 2014 Share What rear derailleur to go for if I have a 11/36 10 speed cassette? Do I go medium or long cage? This is the final part I need to do the conversion. Link to comment Share on other sites More sharing options...
Bobbo_SA Posted January 13, 2014 Share You don't need a 2x front mech or shifter, that's what limit screws are for. A 10sp one will improve shifting because it has a narrower cage, but isn't essential. As for the RD, have a read through this. (If I wasn't doing cartwheels round the shop yesterday I would have helped you out - timing just wasn't great...) Been using my older gen 9spd triple FD for a few weeks now after changing to 2x10 cranks, only problem i have is the spacing between the cage and the large chainring, due to the size difference and the length of the cage i cant lower it down any further to reduce the gap so have been looking for a M786 or SLX FD. What rear derailleur to go for if I have a 11/36 10 speed cassette? Do I go medium or long cage? This is the final part I need to do the conversion. My advice with a 11/36 would be to go with a medium cage RD, although I'm not sure if you have the option with the Shadow+ anymore. Link to comment Share on other sites More sharing options...
Caerus Posted January 13, 2014 Share Been using my older gen 9spd triple FD for a few weeks now after changing to 2x10 cranks, only problem i have is the spacing between the cage and the large chainring, due to the size difference and the length of the cage i cant lower it down any further to reduce the gap so have been looking for a M786 or SLX FD. My advice with a 11/36 would be to go with a medium cage RD, although I'm not sure if you have the option with the Shadow+ anymore. Easybike have this, http://www.easybike.co.za/shimano-xt-rear-derailleur-rd-m786-gs-shadow-silver.html, been hoping too get one in black, but they are very scarce at the moment. Link to comment Share on other sites More sharing options...
deanbean Posted January 13, 2014 Share Dont forget that you will need a 10 speed chain as well.No you don't Link to comment Share on other sites More sharing options...
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