- This topic has 21 replies, 15 voices, and was last updated 13 years ago by rootes1.
-
10 sp specific rear mech, is it necessary?
-
rOcKeTdOgFull MemberPosted 13 years ago
afterall, if the 10sp chain works on 9sp chainrings it’ll work on 9sp jockeys, the cassette is the same distance from one side to the other (only spacing between sprockets is different) and a specific 10sp shifter sorts that and you have a long cage 9sp rear mech anyway why do you need a 10sp specific one
or am i missing something?
RealManFree MemberPosted 13 years agoI’ve been thinking that too, asked several people. Some say no reason it shouldn’t, others say the pull thing is different so it wont (edit: see above). If I go for 10 speed, I’ll buy a 10 speed mech, try everything with the 9 speed mech, if it works, send the 10 speed one back.
rOcKeTdOgFull MemberPosted 13 years agopull ratio?, but the shifters doing all the pulling isn’t it? rear mech is just a spring that’ll go from one side to the other pulled by hand, no “steps” to go through?
svFull MemberPosted 13 years ago36T ring too big for the mech? Maybe with enough b screw tension it might work? Maybe they arent all 36T though!
geetee1972Free MemberPosted 13 years agoROcketDog – that’s what I’m thinking as well, but will happily be informed otherwise.
rOcKeTdOgFull MemberPosted 13 years ago36T ring too big for the mech
it’ll be 32T on my 29er though
scaredypantsFull MemberPosted 13 years agorocket, relative positioning of anchor point, pivot and upper jockey must decide how the mech responds to cable pull, therefore can be different if designed to be
Also, word was when this came up a few wks ago, that 9sp mechs couldn’t cope with 36t sprockets (didn’t lift away from the cassette enough as it went across – presumably that could also be designed in)
no idea what’s really important though (ie may work, just not be perfect)
ourmaninthenorthFull MemberPosted 13 years agoRocketdog – the only limiting factors for mechs is (1) the number of teeth and (2) the ability to travel the distance left to right.
On this basis, I see no difference between any mech.
I’m currently running a 10 speed mech on a 9 speed cassette (with 9sp shifters) on my wonter road bike, after the old mech packed in. Works perfectly.
Pull ratio my arse, brookscycles.
rOcKeTdOgFull MemberPosted 13 years agohmm, might be worth trying then buying a 10sp mech if it dunny work
joe@brookscyclesFree MemberPosted 13 years ago9 speed mechs deal with the 9 speed ’29er specific’ 11-36 SLX cassette fine, apparently.
The pull ratio is the same as the SRAM/Shimano incompatibility. Shimano have gone from 1:2 to something like 1:1.8, and SRAM have gone from 1:1 to 1:0.8 (these figures may be wildly off, I’m not sure).
The real puzzler for me is: Can you use 10 speed flat bar road shifters with a 10 speed MTB mech?
rOcKeTdOgFull MemberPosted 13 years ago9 speed ’29er specific’ 11-36 SLX cassette
i didn’t know there was such a thing? or did you mean 10sp?
singlespeedstuFull MemberPosted 13 years agothe only limiting factors for mechs is (1) the number of teeth and (2) the ability to travel the distance left to right.
On this basis, I see no difference between any mech.
So you can use a sram mech and shimano shifter then…
bristolbikerFree MemberPosted 13 years agoI’m currently running a 10 speed mech on a 9 speed cassette (with 9sp shifters) on my wonter road bike, after the old mech packed in. Works perfectly.
That is true of the last generation 10spd road kit. For the latest stuff, with the shifter cables routed under the bar tape, the pull ratio has changed, so if you use the new shifters with the old mechs the shifter will move more/less (I forget which) than it needs to in order to index…. so you need the latest generation mech with the shifter.
No idea about the 10spd MTB kit…. 😉
joe@brookscyclesFree MemberPosted 13 years agoRocketDog: You’re right, there isn’t. It’s actually a 12-36 Deore level item (I just checked).
CSHG619236, RRP £39.99. Currently in stock.
njee20Free MemberPosted 13 years agoI really don’t get how everyone understands you can’t mix SRAM and Shimano, but no one seems to be able to comprehend the 9/10 speed incompatibility!
Can you use 10 speed flat bar road shifters with a 10 speed MTB mech?
No, but you can use a 9 speed rear mech with 10 speed flat bar shifters.
The older Shimano road stuff is all the same cable pull as 9 speed MTB, it’s only the new 10 speed MTB and the 7900, 6700 and 5600 road stuff that’s different.
SRAM 10 speed is all the same, road and MTB, but that’s not cross compatible with 9 speed.
There will undoubtedly be bodges and workarounds, but basically, you need your mech and shifter to match.
It was being said that chains/cassettes/shifters weren’t cross compatible, but there seem to be a lot of new bikes specced with SRAM shifters and chains with Shimano cassettes. We shall see I guess.
couldashouldawouldaFree MemberPosted 13 years agoYou should find answers to most of the above from some folk who have tried various combo’s here:
rOcKeTdOgFull MemberPosted 13 years agooh yea
http://www.singletrackworld.com/2009/02/shimano-deore-2010/
food for thoughtclubberFree MemberPosted 13 years agoNicely summed up from the mtbr link
I just set up a ten speed system on my bike using a mix of 9 speed and 10 speed parts. Since there is a lot of confusing and contradictory information about Shimano dyna sys 10 speed, I thought I would post up some compatability issues I have found.
1. Road 10 speed derailleurs and shifters are completely incompatible with mountain (dyna sys) 10 speed derailleurs and shifters. The cable pull by the shifters is different for both front and rear.
2. Nine speed rear derailleurs will not work with 10 speed mountain rear shifters. They will however work with road “flat bar” 10 speed rear shifters. Dyna speed shifters pull twice as much cable per shift as 9 speed shifters, so if you use a 9 speed derailleur it shifts two gears for every one push.
3. Dyna sys 10 speed rear derailleurs cannot be used with 9 speed shifters. Road 10 speed derailleurs can be used with 9 speed shifters.
4. Nine speed front derailleurs can be used with 10 speed front shifters, but do not work optimally if used with a 10 speed crankset. Nine speed front derailleurs and cranksets can be used with 10 speed chains and front shifters. A nine speed shifter can be used to shift a 10 speed dyna sys front derailleur.
5. 10 speed road chains are different from 10 speed mountain (dyna sys) chains. The dyna sys chain is a directional chain that is made to shift better with 10 speed mountain drivetrains.
6. 10 speed road cassettes and 10 speed mountain cassette use the same sprocket spacing.
It’s a PITA that road and mtb stuff is no longer compatible (or I wonder is the new Dura Ace compatible since that’s been changed IIRC).
rootes1Full MemberPosted 13 years agopull ratio?, but the shifters doing all the pulling isn’t it? rear mech is just a spring that’ll go from one side to the other pulled by hand, no “steps” to go through?
no it also has it own mechanical ratio in that for a given amount of cable pull it translates that into a certain amount of lateral movement.. that all depends on the relationship or the cable outer stop location and the attachment of the inner cable point etc etc
bugger really though as most 9speed rear can deal with a 11-36 so shame they are these incompatibilities…
smacks of sales – especial the additional incompatibility with road stuff
The topic ‘10 sp specific rear mech, is it necessary?’ is closed to new replies.
