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Rear mech  cage size
#1
Hi I  need to replace my rear mech but dont know what size I need . ( long or short or medium cage )
I  have a 9 speed Sram x7 rear mech on the mtb at the moment but dont know what size it is .
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#2
"Mister B" Wrote:Hi I  need to replace my rear mech but dont know what size I need . ( long or short or medium cage )
I  have a 9 speed Sram x7 rear mech on the mtb at the moment but dont know what size it is .

It won't be short as I believe they only do those in X0. My guess would be as its X7 it'll be a long. The medium cage one is 75mm between centres of the two jockey wheels
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#3
hello dude I have been wrong before but its more to do with what front rings your running. If its a dh rear cassette on a single ring at the front its a short cage, if its a double rig at the front and not running much bigger than a 38ish 9 speed its a medium cage. But if you’re running a triple ring with a 42 or more, best to go for a long cage. Like i say i have been fouled before, and i know a lot of people cheat and use a medium and get away with it.
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#4
Get the impression it's for a direct replacement for what he already has. It won't be short, and if it's longer than 75mm centre to centre then it's a long cage. I run a medium cage with a triple no problems  ;D
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#5
gotta weigh in and say skidz is right here as a rule of thumb. you can use a medium on a triple ring so lagging your are fine as long as your chain is not to tight in in 1st and remember chain length increase on a full sus at full travel. but as for advice to what size mech to  get then med would be better no point running a long if a medium will do but really we need to know what setup your running..and a short cage can be used on non close ratio cassettes i run a short saint on a 11-34t.
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#6
Yeah but Mister B is asking what size is he currently running not what size can I run
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#7
What Lagging said. A like for like replacement is likely to be a long cage, its rare to see anything other in my experience unless its a DH rig.
2010 Canyon Aeroad 9.0 SL
2014 Specialized Epic Marathon
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#8
"Mister B" Wrote:Hi I  need to replace my rear mech but dont know what size I need . ( long or short or medium cage )
I  have a 9 speed Sram x7 rear mech on the mtb at the moment but dont know what size it is .

What bike and year is it? Can't the original spec be found?
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#9
Man were making this sooooo complicated..
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#10
Hi thanks for the advice  My bike is a cannondale F4 xc hard tail  frame with  mavic 717  rims on superstar hubs , hayes stroker trail brakes with floating discs,
SLX  3 chain ring crank , Braided hose , Hope BB ,  superstar nano padals , Pure Natural dropper seat post , Carbon  FSA bars an stem , Rockshock Recon forks ,  All the bolts are Titamium ,  
I have a 9 speed Sram  PG 990  rear cassette an want to replace the X7 rear mech with something better .
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