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.
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.