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Discussion Starter · #1 ·
I have an older Bianchi grizzly bike with Shimano shifters, 7 speed. When shifting the cassette and in the center front ring I am getting inconsistent shifts. some times I click the shifter twice to shift rings and sometimes it needs three clicks or 1 click on the shifter. It will also shift on its own when I start to climb every once in a while. So what do I need to do to fix this? Also I haven't quite got all the parts and stuff figured out with this hole bike deal so I am wondering if a Sram X7 shifters and derailleur will work on the 7 speed.

Thanks guys
 

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without riding or seeing the bike it's a little tough as many things can cause inconsistent shifting (bent derailleur hanger, worn out cassette, bad link in the chain) ...but my money would be on cables..if they are too loose or too tight then it can either be slow to shift or it can ghost shift...try replacing them and see if that fixes your issue...it's a cheap solution and I suspect your bike would benefit from new cables if they haven't been changed out in some time.....good luck
 

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Fat-tired Roadie
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+1 on cables.

Is the ghost shifting when you climb out of the saddle? It could be a worn or incorrectly installed bottom bracket or crank.

This kind of shifter...



or this kind?

 

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cables and housing good condition and smooth operation? chain in good shape? cassette and chain rings also in good shape? der hanger not bent? cable probably needs more than just adjusted but it sounds like a lot of things i asked are broken/need to be fixed. consult a local shop, without seeing this it is really really hard to diagnose.
 

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Discussion Starter · #5 ·
Had it into a bike shop about 100 miles ago. they replaced the cables and adjusted everything. It shifted ok but not great. last time out I adjusted the rear derailleur as it would not shift into the large gear anymore. This time out going down a bumpy road with the chain in the small gear the chain bounce off the gear on to the hub. I put it back on and tried to get it to do it again but it would not over shift off the gear. I do have a lot of travel in the shifter after I hit the rear large gear the shifter travels another 1/2 inch or better. I think I am going to print off the directions on how to set up a rear derailleur and re work it, im a handy guy so its time to get dirty. Once I started adjusting seats and handle bar heights as well as front brakes I remembered that working on bikes is not all that hard so I might as well figure out what I need to do with this problem.

Were talking around 1985 shifters, 1 lever on each side of the handle bar. move the shifters levers to the right for easy and to the left for hard. They say Shimano unishift control on them.
 

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Fat-tired Roadie
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Does the front derailleur move freely?

If the pivots are screwed up enough, I could see it taking inconsistent amounts of tension to move it. That would account for sometimes 1 click, sometimes 3 clicks, and ghost shifting when you get out of the saddle.
 

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Muddydogs said:
Had it into a bike shop about 100 miles ago. they replaced the cables and adjusted everything.
After about 100 miles, you would expect that your new cables have stretched out a bit. You need to increase the tension in your cable. The barrel adjuster should have enough adjustment to take care of it.

Great info here.
 
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