--------------------------------------------------------------------------------Hey, I was thinking abo ut doing the same upgrade (a 10sp xtr crank on an otherwise 9 drivetrain) but my lbs has just told me they could never get a 10 sp chain shift well over the 9 cassete.
I understand the need for a 10 sp fr deraill. But is the 10 sp chain a must?
I measured everything before and after and the spacing between the chain rings is the same, as I posted the differance in the chain ring thickness is .003 if an inch ! Just got back from a 2 hour ride and no problems. I spent a good amount of time with it on the stands setting the height of my front derailluer (FD-970 low mount) currently set at 3 mm above the 38 t ring and shifting great. I should add that I all waays have run my chain line at 46.5 mm not the standard 50mm that is the stock set up for FC-M970 crank set, I just removed the center dust tube and run a .7mm spacer on the drive side and a 2.5 & .7mm on the non drive side this moved the chain ring into the frame 3.5 mm. Then add a 2 mm pedal spacer to equal it out at the pedals.Spin cycle, so you think that if i use the m980 26 -38 crankset, with all my m970 stuff, will work? Just setting the limits of the fd and maybe using a spavcer?
I know I'm dragging up an old post here, but from what you're saying, in theory you can set up a 10 speed system using the new xt/xtr front shifters with the old xo 9 speed rear mech & a 10 speed cassette.Because in order to improve the reliability of the mtb 10 speed shifting, shimano has finally admitted to themselves that SRAM had the right idea lowering the leverage ratio of the rear derailleur cable pull geometry (which makes the derailleur less sensitive to cable stretch and tension changes from shifter housing movement on a rear suspension bike). So the shifters now pull more cable than before for each shift. SRAM's 10 speed shifters and derailleurs also pull more cable than their 9 speed units. I believe the SRAM 10 speed works out as a 0.8:1 ratio now, their 8/9 speed stuff is 1:1, all shimano derailleurs except the new 10speed mtb (and the 7/8 speed DuraAce) are 2:1 and the shimano 10s MTB is I believe its been measured out as something like 1.25:1.
I've just re-read the whole thread and based on what people tried and reported, 9sp SRAM rear ders are in fact interchangeable with 10sp Dyna-Sys units.I know I'm dragging up an old post here, but from what you're saying, in theory you can set up a 10 speed system using the new xt/xtr front shifters with the old xo 9 speed rear mech & a 10 speed cassette.
You should not run into any issue using the XT Dyna RD- the special profile/directional chain only affects the outside of the chain_Read the whole thing as well....but couldn't find the answer to my question. Will the SRAM 10 speed chain(s) and cassette(s) work with the Shimano Dyna-Sys 10 speed RD? Can't exactly figure out how and why EXACTLY the Shimano chains are directional...? I know it's for "the bestest shifting in the galaxy", but thats about it.