Bicycle Mechanics - Giant Cypress Twist-grip shifter problem
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08-30-08, 08:13 PM
I just bought a used Giant Cypress bike on Craig's List. I love the bike but today the right twist-grip shifter started mal-functioning. The left shifter clicks as the gears shift up and down but I don't hear the clicking sound from the right shifter and when I shift down the shifter does not stay in gear. It slips down to the highest gear as soon as I let go of the shifter.
Can someone point me in the right direction? Is something broken or is something in need of an adjustment?
I wanted to try fixing this myself before I take it to a bike shop.
Thanks in advance for any help anyone can share that might point me in the right direction.
08-30-08, 08:27 PM
You might get it to work by flushing it out with WD40, but new ones are cheap enough it's not worth spending too much time on.
08-30-08, 09:13 PM
I would avoid WD40 or other high-solvent treatment, as the twist shifter's internal components are likely plastic. However, as w points out, a whole new shifter should only cost $10-20.
08-30-08, 09:16 PM
Where would I be able to find one of these shifters? What's a good place on the internet to find these kinds of parts?
I ride a hybrid with many components the same as your Cypress, including the Sram MRX twistgrip shifters. About a year ago (3000 miles on it) the right twistshifter on the bike did the same thing as yours. I bought a replacement at LBS for about $15 and put it on myself, as the included directions were easily understood. I took the old one apart, determined that a spring (shaped similar to a ~) was no longer operable because a plastic nub (part of the housing, but internal) had worn down. Thus the spring could no longer hold a selected gear. About a month later I had to replace the left twistgrip, for the same reason. The new twistshifter comes with a cable, so just feed it thru the cablehousing, and attach to deraileur. Now that I thought about it, I recall that the problem first started with a cracked housing, which I kept taped until the shifter finally failed.
08-30-08, 11:54 PM
cl - as do suggests, probably best just to buy a complete left and right shifter pair. First, confirm that your left shifter/front crankset have 3 gears (this is standard). Second, count how many gears the right shifter and rear gear cassette have. This will likely be 7 or 8, but perhaps 9. You'll need to buy a shifter pair with the correct right/rear gear count:
Here are some decent choices:
For 7 gears: http://www.rei.com/product/737410 or http://www.bikeman.com/LD4751.html
For 8 gears: http://www.rei.com/product/737409 or http://www.bikeman.com/LD4750.html
For 9 gears: http://aebike.com/page.cfm?PageID=30&action=details&sku=LD2685 or http://www.bikeman.com/LD2685.html
09-01-08, 06:54 PM
THANKS SO MUCH FOR ALL THE RESPONSES! I got the shifter at my LBS, installed it, and it works great!
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