1 have a mid 90's bike with a Shimano Acera X that will not shift
1 have a mid 90's bike with a Shimano Acera X , St-M290 Dual SIS at the front and a Acera X 7 speed, St-M390 for the back.
After serveral years not being able to ride this bicycle (health reasons), I wanted to use ist again, but I am not able to shift into any gear, besides the ones that are on. the shift indicators don't look into any other numbers, etc. and the grats don't change either. How can I adjust this to get the thing going again?
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Re: 1 have a mid 90's bike with a Shimano Acera X that...
It sounds like you're saying there is a physical reason the shifters won't move the derailleur(s). If the bike has truly been idle for a long time it's likely the cables have rusted inside the cable housing. Bottom line: a professional bike shop tune-up will bring it all back to working order.
Or if you're adventurous and have all the special tools, surf over to Parktool.com and look around. They have excellent instructions for most everything and the tools to make it happen.
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Most bikes have Shimano shifters & deraillers; SRAM is the other main vendor. Shimano makes a wide range; the following table attempts to describe these and presents my best guess of where the SRAM line fits in: Model Quality SRAM Equivalent? SIS, Tourney (or just says Shimano) Mainly designed for riding around the neighborhood Altus Sufficient for paved or very easy trails; avoid hills 3.0 Acera Slightly better, but won't shift well under stress; capable for easy casual riding 4.0 Alivio Minimal capable for recreational riding; will handle some hard riding 5.0 STX / Deore Entry-level components for hard riding; tough & reliable 7.0 LX The minimum standard for hard riding. Reliable & responsive 9.0 XT More responsive than LX, but still reasonable tough 9.0SL XTR Light, responsive racing components; tend to be quite expensive; often sacrifices toughness for responsiveness X.0
Look for a component set that fits your expected riding style.
Note:The numbered SRAM components aren't compatible with Shimano components. SRAM does make grip-shifters that are Shimano-compatible.
There are many other manufacturers that specialize in various components (Avid, Cane Creek, Race Face, Hope) and make great ones. Ask the LBS personnel for a comparison if you see a brand you don't know. Also, you can use the same test as forks above: if its not sold separately, its probably more questionable. If you're getting a full-suspension bike, make sure you get a good rear shock as well (it'll probably be something other than SRAM or Shimano).
Don't know if you have an exploded view diagram of the levers . If not you can download from http://techdocs.shimano.com/techdocs/index.jsp
In the road bike drop down list select Dura-Ace, go down to ST-7900 and select document EV-ST-7900-2874. I don't advise you to take mech apart unless you have special tools and bags of experience handling complex mechs. However you will see that name plates are held by single screw which should be no problem.
There is a limit screw on the body of the derailleur that you have to back out slightly. You can tell which one of the two it is by watching carefully as you adjust it. It takes a phillips screwdriver.